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Climbing Finger Strength Analyzer 2.0

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New! - Sport Climbing Level Calculator!

If you're a sport/lead climber, there's a new tool available! The Sport Climbing Level Calculator!

The Sport Climbing Level Calculator is designed specifically for sport/lead climbers. It analyzes the athlete's finger strength and forearm endurance profile to estimate the expected climbing grade accurately.

The Sport Climbing Level Calculator will:

  • Let you know how hard you could be climbing at your current fitness level
  • Pinpoint your biggest weaknesses and help you effectively target them
  • Give you an instant automatic assessment and help you design a training plan tailored to your exact needs!

If you're a sport/lead/trad climber, follow this link. If you're a boulderer, stick with the Climbing Finger Strength Analyzer 2.0.

Climbing Finger Strength Analyzer 2.0

The Bouldering Finger Strength Calculator will allow you to see how strong your fingers truly are. Simply add a load to your harness and hang two-handed or one-handed on the edge of your choice for as long as you can.  You may use either the half crimp or open crimp hold position. Input your height, arm span, body weight, and select your current mode of hangboard training. The analyzer will then predict your average bouldering level. The result is fairly consistent with the Lattice finger strength benchmarks.

The result will give you a basic idea of how hard you should be able to boulder at the moment and how much stronger you need to get to progress. It will also allow you to determine whether it's strength or technique that is potentially holding you back! So get your weight belt on, or hang a bucket full of sand from your harness, hop on the hangboard, and see if you're the next Alex Megos!

Please let me know if the result was accurate for you! I would appreciate it if you could provide your bouldering finger strength input parameters together with your result in the post comments section. This will help me improve the algorithm in the future!

Important: Warm-up your fingers and shoulders thoroughly before performing the tests, or before engaging in any climbing training. This will not only help you to avoid injury, but the result of the analysis will also be more accurate. To obtain the best results, follow the detailed instructions on how to use the Finger Strength Climbing Analyzer in the sections below.

Note: This is just an automatic bouldering level assessment. To get insight into your lead climbing performance, you can use the Critical Force Calculator, or if you would like to get a personal climbing performance evaluation like this one, please feel free to contact me directly at [email protected].

Want to know how to make perfect MVC-7 measurements for the calculator?
Read this article.

Your Input
Body parameters:
Finger strength module:
Mode 1: At least twice a week, including weighted hangs
Mode 2: At least once a week, but I mainly do Repeaters
Mode 3: I do some random hangboarding from time to time
Mode 4: I don't use a hangboard at all - I just climb!












Pull-ups module: on off
















Calculated Results

Climbing Finger Strength Analyzer – Instructions

Below are the detailed instructions on how to use the calculator to accurately measure your climbing finger strength.

  1. Warm-up your fingers and shoulders thoroughly! This will help you to:
    • Avoid injury;
    • Get more accurate results.
  2. Pick an edge between 5 – 25 mm deep.
    • Using the 20 mm edge will let you compare your result directly with the Lattice Training standard.
    • The calculator uses an algorithm to convert between different edge depths, but an element of uncertainty is introduced.
  3. Decide on the hang time you will aim for.
    • You will get the best accuracy for 7-second hangs (MVC-7).
    • Beginners and climbers with limited hangboarding experience should use 10-second (MVC-10), or even 15-second (MVC-15) hangs.
    • The calculator can convert between different hang times using a slightly altered version of the Rohmert’s curve 1.
  4. Decide on the hold position.
    • Both half crimp and open crimp positions are allowed.
    • Choose your stronger position.
  5. Perform a series of 3 – 4 progressively heavier recruitment hangs in the chosen hold position on the selected edge.
    • To be able to generate maximum force, you need your muscles to be recruited!
    • Use at least 10-second hangs to allow sufficient time for recruitment.
    • Start at your body weight and keep adding around 5 – 10 kgs to each consecutive hang until the hangs start feeling hard.
    • Rest 1 – 3 minutes between recruitment hangs.
  6. Rest for 10 – 15 minutes after your last recruitment hang and start the maximum finger strength testing procedure.
  7. Based on your recruitment hangs, try to predict the load allowing you to hang for the test time you’re aiming for.
    • Hang in the half crimp or open crimp hold position for as long as you can.
    • Adjust the load based on how hard it was to achieve the hang time that you aimed for.
    • Rest 3 – 5 minutes and repeat the measurement.
    • Execute up to 8 test hangs, until you feel like you can no longer improve your result.
  8. Input your height, body weight, the added hang load, test edge depth, and maximum finger strength climbing test hang time into the calculator. You can use negative numbers to subtract weight.
  9. Select the mode of hangboard finger strength training you are using.
    • If you do max hangs regularly, your test result will be higher than for people who only do Repeaters or don’t train on the hangboard at all. The calculator takes that into account.
  10. Take a look at your result.
    • If it’s lower than what you normally climb, then:
      • Consider redoing the test after a couple of days to see if it’s not just a matter of getting used to the test procedure and to doing maximum strength tests.
      • What about your technique? Is it possible that you can compensate for your low strength with flexibility or experience?
      • Think about your preferred climbing style. Do you excel at climbing slabs or overhangs?
      • When was the last time you climbed? Your strength may have deteriorated since then.
    • If your result is higher than what you normally climb, then:
      • Think about your finger training – are you in the middle or at the end of a maximum strength training cycle? Make sure that the correct hangboard training option is selected.
      • What about your technique?
        • Do you tend to power through moves?
        • Do you rely enough on your feet?
        • Are you flexible?
      • When was the last time you climbed? Your strength may have improved since then.
  11. If you can, please write a comment with your input and results. This will help me improve the tool in the future!

Important: Remember that the calculator tool should only serve as an aid in your finger strength training and that it provides just a rough climbing grade prediction! The quality of the analysis strongly depends on the quality of the input you provide.

Example measurements

Let’s take a look at the following examples to see how to perform the maximum bouldering finger strength measurements correctly.

First of all, remember to warm up thoroughly – only warmed up muscles can perform at their full potential. The warmup should include your fingers, your forearm flexor muscles, and your shoulders.

Next, perform a series of hangs at bodyweight on progressively more difficult holds to trigger initial muscle recruitment. Further recruitment will be done during your test hangs, so you will likely achieve your best result in the third or fourth test hang, and not in the first one or even in the second one.

Take 3 – 5-minute rests between the test hangs to allow full phosphocreatine regeneration 2.

Example 1: Correct

The goal is to determine the MVC-7, which is the maximum load with which the climber can hang for a full 7 seconds only.

  • Hang 1:
    • Added load: 0
    • Result: 16 s
  • Hang 2:
    • Added load: 6 kg
    • Result: 13 s
  • Hang 3:
    • Added load: 9 kg
    • Result: 7 s
  • Hang 4:
    • Added load: 9 kg
    • Result: 3 s – climber was not focused
  • Hang 5:
    • Added load: 9 kg
    • Result: 7 s – confirmation of the result
  • Hang 6:
    • Added load: 9 kg
    • Result: 3 s – climber was already tired

Final recorded result: MVC-7 is bodyweight + weight of clothes + 9 kg

Example 2: Correct

The goal is to determine the MVC-10, which is the maximum load with which the climber can hang for a full 10 seconds only.

  • Hang 1:
    • Added load: 6 kg
    • Result: 10 s
  • Hang 2:
    • Added load: 6 kg
    • Result: 7 s – climber did not recover from the previous hang or was not focused
  • Hang 3:
    • Added load: 6 kg
    • Result: 15 s – full muscle recruitment was reached
  • Hang 4:
    • Added load: 9 kg
    • Result: 10 s
  • Hang 5:
    • Added load: 12 kg
    • Result: 4 s – the load was too high
  • Hang 6:
    • Added load: 9 kg
    • Result: 9 s – climber was already tired

Final recorded result: MVC-10 is bodyweight + weight of clothes + 9 kg. Notice that the climber did not settle for Hang 1 and continued the measurement to reach a better result in Hang 3 and in Hang 4.

Example 3: Incorrect

The goal is to determine the MVC-7, which is the maximum load that allows the climber to hang for a full 7 seconds only.

  • Hang 1:
    • Added load: 6 kg
    • Result: 7 s – done!

Final recorded result: MVC-7 is bodyweight + weight of clothes + 6 kg.  Surely the climber could have done better in the subsequent hangs. Such a measurement will lead to an underestimated result of the analysis.

Example 4: Incorrect

The goal is to determine the MVC-7, which is the maximum load with which the climber can hang for a full 7 seconds only.

  • Hang 1:
    • Added load: 0 kg
    • Result: 28 s – climber got very tired and burned out the PCr completely. Full recovery will take more than 5 minutes.
  • Hang 2:
    • Added load: 3 kg
    • Result: 14 s – climber was tired
  • Hang 3:
    • Added load: 6 kg
    • Result: 13 s – climber began to recover
  • Hang 4:
    • Added load: 9 kg
    • Result: 6 s – tired from previous hangs
  • Hang 5:
    • Added load: 8 kg
    • Result: 7 s – tired

Final recorded result: MVC-7 is bodyweight + weight of clothes + 8 kg.  This is an underestimated result because the climber got very tired after the first 28-second test hang. Based on the extrapolation of the result of Hang 1, the actual MVC-7 result should be at least +12 kg.

As you can see, taking a good measurement requires some effort and a conscious approach. Also, notice that it’s far more likely that your result will be underestimated rather than overestimated. Overestimation of the output may occur if you:

  • Use a test edge that’s bigger than you realize;
  • Use a sped-up timer;
  • Turn the pull-ups module off and rely solely on your bouldering finger strength measurement, while your upper body strength is very low;
  • Have a very big discrepancy between your half crimp and open crimp strength;
  • Never try hard enough while climbing on the rock or at the gym;
  • Set the wrong fingerboard training mode, e.g., Mode 4 instead of Mode 1;
  • Climb in rock formations that don’t suit your style;
  • Climb in sandbagged areas.

If you exclude all the above cases, and your result is still overestimated compared to your true average bouldering level, please let me know – perhaps the algorithm requires an adjustment.

Output interpretation

In principle, the calculator outputs your average predicted climbing grade based on your current fitness level. This means that it gives you the grade at which you should be able to project and send a boulder problem within a reasonable time and number of attempts – something like  1 – 3 sessions at the most. To understand this concept better, let’s look at the results of the r/climbharder survey from 2017 3.

The r/climbharder survey has 555 records, where climbers specify their height, weight, max hang added loads, and a lot of other useful parameters. The most interesting part is that the respondents also specify their bouldering level, but they give three different grade values:

  • The average bouldering grade, meaning the grade they can climb 90 – 100% of the time
  • The maximum grade they climbed in the last three months
  • The maximum grade they ever climbed

Out of all the survey responses, 157 were useful for testing the analyzer because they contained complete information required to perform the calculation. I analyzed all 157 records, and it turns out that the output from the calculator is closest to the reported maximum grade that the climbers climbed in the last 3 months – roughly 50% of the calculated results lied within the +/- 1 V grade range of accuracy. This should come as no surprise because the calculator takes into account the currently measured parameters of the climber.

However, about 35% of the results reported were more than a single V grade higher than the prediction from the bouldering finger strength calculator, and 15% were lower. Therefore the algorithm has a tendency to underestimate the maximum grade climbed in the last three months. Still, this is understandable because the maximum grade climbed is clearly at the high end of what the climber can achieve.

I will publish the results of a more thorough statistical analysis of the r\climbharder survey records in a separate post.

Hint: To estimate your Moonboard level, subtract 2 V grades on average from your result. So if the result of the calculation is V6, you can expect to climb V4 on the Moonboard. The Moonboard is not sandbagged. It just requires a correction factor 😉 

Bouldering Finger Strength Calculator – Algorithm Overview

In numerous research publications, it was shown that the Maximum Voluntary Contraction (MVC) of the finger flexors, measured by means of a hangboard is a very good predictor of the climber’s performance on the rock 456789. The trend I observe is to perform the measurements using one-handed hangs, but measurements performed using two arms are also valid 10. The advantage of two-arm hangs is that, in contrast to one-arm hangs, they rarely require the assistance of a pulley system. Instead, the load is often added to the climber’s weight rather than subtracted.

The core of the Climbing Finger Strength Calculator is the data from the MaxToGrade internet poll published at 11. As of May 2020, the survey was filled in by over two thousand climbers from the V1 – V17 climbing range. The results of the survey are characterized by very high variability and low reliability, as it is impossible to control data acquisition in any way. However, up to V13 bouldering level, the mean value seems to be consistent with the Lattice finger strength benchmarks published by Lattice Training on their Instagram 12.

The current Bouldering Finger Strength Analyzer version 2.0 was significantly improved compared to the initial version 1.0 that was developed in Mar. 2019. Version 1.0 was based solely on my interpretation of the data from 11. In version 2.0, the results published in 12 were also taken into account.

The algorithm was modified to satisfy cases I found on the internet forum discussions, in various internet articles, as well as those taken from my own research database. I also introduced a new module that takes into account the climber’s height and arm span as well as the frequency and intensity of their hangboard training. An auxiliarly Pull-ups module was added that renders it possible to fine-tune the result.

Impact of the climber’s height

The influence of the climber’s height and weight on their climbing performance and the finger strength required for them to boulder on a certain level is a neverending discussion. If you’re interested, you can read multiple Reddit threads and other articles that touch on that topic 131415161718192021.

I thoroughly reviewed these sources, as well as the comments on my blog and Facebook posts. In the end, I concluded that statistically, taller climbers require less finger strength relative to their body weight to climb a particular grade. With this approach, the algorithm was able to satisfy most of the investigated cases with decent accuracy. However, I would be grateful for any constructive feedback in the comments. This will help me introduce further adjustments to the program and also better understand the phenomena underlying the high variability of the results. 

Impact of hangboard training mode and familiarization

As I studied the results submitted by climbers on Reddit, I realized that people who rarely use the hangboard in general report lower relative finger strength required for them to climb on a given level than those who train with maximum hangs regularly. The above observation may, to some degree, be attributed to the effect of familiarization. It was reported that higher strength scores could be obtained if the finger strength climbing test is repeated after one week 4. What is more, climbers with little hangboarding experience usually don’t know how to measure their MVC to obtain the maximum possible result. 

On the other side of the spectrum, by observing my results, I noticed that during maximum finger strength training cycles, my MVC-7 is significantly higher than during hypertrophy cycles, when I mostly do 7/3 Repeaters. I believe this effect to be related to the differences between central nervous system adaptations during maximum strength and hypertrophy cycles.

That is not to say that the results of the measurements are not valid, but I think that it makes sense to introduce a correction factor both for people who do train maximum hangs and for people who don’t use the hangboard at all. With the correction algorithm, I was able to make sense of the results reported by the climbers on internet fora, people who commented under my blog and Facebook posts, as well as from the assessments I performed on myself and on the climbers that I coached.

Edge depth and hang time conversion

As mentioned before, the best accuracy of the measurements is obtained if the measurements are performed on a 20 mm edge for 7-seconds hang time. However, a 20 mm edge is not always available, and MVC-7 tests can prove to be too risky not only for climbing beginners but also for advanced climbers if they don’t have enough hangboarding experience.

For these reasons, I implemented an algorithm that makes it possible to relate different hang times on different edge depths to the baseline MVC-7 at 20 mm edge results. The edge depth conversion algorithm is based on generally available results, as well as on my own experience and on the experience of professional coaches with whom I discussed this subject 22

The hang time to maximum strength calculation is based on my variation of the Rohmert’s curve 1. You can find more information on the Rohmert’s curve and other hang time mathematical models in 23.

Impact of grip type

Originally Lattice Training recommended carrying out the tests in the half crimp hold position 10. However, in their more recent publication, they allow both the half crimp hold position and the open crimp position. The full crimp and three finger drag positions remained disallowed 9.

It may happen that there is a big discrepancy between your half crimp and open crimp strength. In that case, you should use the stronger grip position. You can also experiment and take the average from the two measurements, to see if that improves the accuracy.

Example test input cases

  1. Adam Ondra
    • Weight: 68 kg
    • Height: 185 cm
    • Arm span: 186 cm
    • Added hang load (one arm, 5 sec, 23 mm edge, open crimp): 10 kg 421
    • Hangboard training mode: Difficult to say, but probably somewhere between Mode 1 and Mode 2
    • Pull-ups module: OFF
    • Calculated average bouldering grade result: V15 (8C)
    • Reported maximum bouldering grade result at the time of the test: V16 (8C+)
  2. Alex Megos
    • Weight: 57 kg
    • Height: 173 cm
    • Arm span: 173 24
    • Added hang load (one arm, 7 sec, 20 mm edge): 18 kg 21
    • Hangboard training mode: Probably Mode 1
    • Pull-ups module: OFF
    • Calculated average bouldering grade result: V17 (9A)
    • Reported maximum bouldering grade result: V15/V16 (8C/8C+)
      • Alex never did a 9A, but he is so strong that I guess he should be able to do it.
  3. Magnus Midtbø
    • Weight: 69 kg
    • Height: 174 cm
    • Arm span: 174 cm
    • Added hang load (one arm, 7 sec, 20 mm edge: 5 kg): 25
    • Hangboard training mode: Difficult to say, but probably somewhere around Mode 2 now
    • Pull-ups module: OFF
    • Calculated average bouldering grade result: V13 (8B)
    • Calculated by Lattice Training from their test: V13 (8B)
  4. Climber 1 (personal database)
    • Weight: 110 lbs
    • Height: 61 inch
    • Arm span: 61 inch
    • Added hang load (two arms, 7 sec, 14 mm edge): 100 lbs
    • Fingerboard training mode: Mode 1
    • Pull-ups module: OFF
    • Calculated average bouldering grade result: V10 (7C+)
    • Reported maximum bouldering grade result: V10 (7C+)
  5. Climber 2 (personal database)
    • Weight: 125 lbs
    • Height: 64 inch
    • Arm span: 64 inch
    • Added hang load (two arms, 7 sec, 20 mm edge): 45 lbs
    • Fingerboard training mode: Mode 3
    • Pull-ups module: OFF
    • Calculated average bouldering grade result: V5 (6C)
    • Reported maximum bouldering grade result: V6 (7A)
  6. Climber 3 (personal database)
    • Weight: 57 kg
    • Height: 164 cm
    • Arm span: 163 cm
    • Added hang load (two arms, 10 sec, 20 mm edge): 0
    • Fingerboard training mode: Mode 4
    • Pull-ups module: OFF
    • Calculated average bouldering grade result: V2 (5+)
    • Reported maximum bouldering grade result: V3 (6A)
  7. Climber 4 (personal database)
    • Weight: 67 kg
    • Height: 172 cm
    • Arm span: 184 cm
    • Added hang load (two arms, 7 sec, 20 mm edge): 61 kg
    • Fingerboard training mode: Mode 1
    • Pull-ups module: OFF
    • Calculated average bouldering grade result: V11 (8A)
    • Reported maximum bouldering grade result: V10 (7C+)
  8. Reddit Climber 1 (r/climbharder survey)
    • Weight: 78 kg
    • Height: 184 cm
    • Arm span: 184 cm
    • Added hang load (two arms, 10 sec, 18 mm edge): 35 kg
    • Training mode: Mode 4
    • Pull-ups added load: 30 kg (5 rep max)
    • Calculated average bouldering grade result: V10 (7C+)
    • Reported best ever bouldering grade result: V11 (8A)
    • Reported maximum bouldering grade result (last 3 months): V10 (7C+)
    • Reported grade at which can send 90% – 100% problems: V8 (7B) 26
  9. Reddit Climber 2 (r/climbharder survey)
    • Weight: 68 kg
    • Height: 180 cm
    • Arm span: 181 cm
    • Added hang load (two arms, 10 sec, 18 mm edge): 64 kg
    • Hangboard training mode: Mode 1
    • Pull-ups added load: 30 kg (5 rep max)
    • Calculated average bouldering grade result: V11 (8A)
    • Reported best ever bouldering grade result: V10 (7C+)
    • Reported maximum bouldering grade result (last 3 months): V10 (7C+)
    • Reported grade at which can send 90% – 100% problems: V7 (7A+) 26
  10. Reddit Climber 3 (r/climbharder survey)
    • Weight: 58 kg
    • Height: 175 cm
    • Arm span: 178 cm
    • Added hang load (two arms, 10 sec, 18 mm edge): 20 kg
    • Training mode: Mode 2
    • Pull-ups added load: 23 kg (5 rep max)
    • Calculated average bouldering grade result: V6 (7A)
    • Reported best ever bouldering grade result: V8 (7B)
    • Reported maximum bouldering grade result (last 3 months): V8 (7B)
    • Reported grade at which can send 90% – 100% problems: V5 (6C) 26
  11. Reddit Climber 4 (r/climbharder survey)
    • Weight: 59 kg
    • Height: 168 cm
    • Arm span: 168 cm
    • Added hang load (two arms, 10 sec, 18 mm edge): 9 kg
    • Training mode: Mode 1
    • Pull-ups added load: 4.5 kg (5 rep max)
    • Calculated average bouldering grade result: V2 (5+)
    • Reported best ever bouldering grade result: V7 (7A+)
    • Reported maximum bouldering grade result (last 3 months): V7 (7A+)
    • Reported grade at which can send 90% – 100% problems: V6 (7A) 26
    • This is an example of a result that does not make any sense. Probably the climber did not measure the finger strength and pull-ups properly. I find it highly unlikely for a climber with such low parameters to consistently send V6 while being in a maximum finger strength climbing training cycle.

Finger Strength Analyzer – conclusions

I believe that the Finger Strength Calculator can serve as a powerful tool both for climbers and coaches. I find it very useful for designing training programs and in particular for optimizing training loads for strength training cycles. However, the tool is under constant development and your feedback is vital for its further improvement, so please don’t hesitate to comment and give me your opinion, particularly if you think that your results don’t make any sense. 

Please remember that the analyzer tool should only serve as an aid in your training and that it provides only a rough climbing grade prediction!


  1. Rohmert, W., 1960. Ermittlung von Erholungspausen für statische Arbeit des Menschen. Internationale Zeitschrift für Angewandte Physiologie Einschliesslich Arbeitsphysiologie 18, 123–164. (link)[][]
  2. J. Banaszczyk, StrengthClimbing – Eric Hörst’s “7-53” finger strength hangboard routine, Jan. 21, 2019. (link)[]
  3. r/climbharder, Climbharder Survey results, Apr. 19, 2017 (link)[]
  4. Baláš, J., Mrskoč, J., Panáčková, M., Draper, N., 2014. Sport-specific finger flexor strength assessment using electronic scales in sport climbers. Sports Technology 7, 151–158. (link)[][][]
  5. Michailov, M.L., Baláš, J., Tanev, S.K., Andonov, H.S., Kodejška, J., Brown, L., 2018. Reliability and Validity of Finger Strength and Endurance Measurements in Rock Climbing. Research Quarterly for Exercise and Sport 89, 246–254 (link)[]
  6. Baláš, J., Pecha, O., Martin, A.J., Cochrane, D., 2012. Hand–arm strength and endurance as predictors of climbing performance. European Journal of Sport Science 12, 16–25. (link)[]
  7. Fryer, S., Stone, K.J., Sveen, J., Dickson, T., España-Romero, V., Giles, D., Baláš, J., Stoner, L., Draper, N., 2017. Differences in forearm strength, endurance, and hemodynamic kinetics between male boulderers and lead rock climbers. European Journal of Sport Science 17, 1177–1183. (link)[]
  8. Macleod, D., Sutherland, D.L., Buntin, L., Whitaker, A., Aitchison, T., Watt, I., Bradley, J., Grant, S., 2007. Physiological determinants of climbing-specific finger endurance and sport rock climbing performance. Journal of Sports Sciences 25, 1433–1443. (link)[]
  9. Torr, O., Randall, T., Knowles, R., Giles, D., Atkins, S., 2020. Reliability and Validity of a Method for the Assessment of Sport Rock Climbersʼ Isometric Finger Strength. Journal of Strength and Conditioning Research 1. (link)[][]
  10. Giles, D., Chidley, J.B., Taylor, N., Torr, O., Hadley, J., Randall, T., Fryer, S., 2019. The Determination of Finger-Flexor Critical Force in Rock Climbers. International Journal of Sports Physiology and Performance 1–8. (link)[][]
  11. (link)[][]
  12. Lattice Training – Instagram, Boulder Grade vs. Finger Strength (2 Arm), Mar. 16, 2020. (link)[][]
  13. – Ideal BMI, Height, Age for climbing ( data visualizing), Sept. 26, 2019. (link)[]
  14. C. Ring, Rock and Ice – The Height of Injustice: Is Being Tall an Advantage in Your Climbing Career?, Apr. 21, 2019. (link)[]
  15. A.J. Warnke, Climbstat – The disadvantage of being tall in rock climbing seems to be driven by higher weight, Dec. 16, 2018. (link)[]
  16. r/bouldering, How much does height affect bouldering?, Dec. 02, 2015. (link)[]
  17. r/bouldering, Harder being tall or short, Jan. 30, 2017. (link)[]
  18. r/climbing, Does height matter?, Feb. 21, 2018. (link)[]
  19. r/climbharder, Height, Climbing Performance and the Role of Weight, Sept. 28, 2019. (link)[]
  20. r/climbharder, 8-Month Hangboard Finger Strength Training Program Results, Apr. 06, 2020. (link)[]
  21. R. Knowles, Lattice Training, Height in Climbing, Aug. 10, 2017. (link)[][][]
  22. López-Rivera, E., 2014. Efectos de diferentes métodos de entramiento de fuerza y resistencia de agarre en escaladores deportivos de distintos niveles, Tesis doctoral, Universidad de Castilla-La Mancha. (link)[]
  23. J. Banaszczyk, StrengthClimbing – Steve Bechtel’s 3-6-9 Ladders Hangboard Finger Strength Training, May 18, 2019. (link)[]
  24. r/climbing, I am Alex Megos, Ask Me Anything!, Nov. 05, 2014. (link)[]
  25. Magnus Midtbø, YouTube, WORLDS HARDEST CLIMBING TEST | #153, Mar. 29, 2019. (link)[]
  26. r/climbharder, Climbharder Survey results, Apr. 19, 2017. (link)[][][][]
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61 thoughts on “Climbing Finger Strength Analyzer 2.0”

  1. i kinda know that i am REALLY weak for my climbing lvl but i still did not expected THIS 😀 i climb for 10 yrs now so i probably can “cheat” a lot with technique. i almost dont boulder outside (one trip to font and a couple days besides that really) but i do a lot inside. did up to 7b in font, some 7a or + in other places – but i never projected anything outside bouldering-wise. (outside i mainly sport climb: up to 7b, with my PB being 7c+[though i projected it for like 4 months or sth])

    Your Input
    Body parameters:
    Height [cm]:
    Arm Span [cm]:
    BW [kg]:
    Finger strength module:
    Specify your hangboard training mode:
    Mode 3: I do some random hangboarding from time to time
    Two-Arm Hang
    Added Hang Load [kg]:
    Edge depth: 20 mm
    Hang time: 7 s
    Pull-ups module: on
    Added Load [kg]:
    Number of pull-ups: 2

    Calculated Results
    Comfortable projecting level:
    V4 or Font. 6B+
    Detailed assessment:
    Probabiltity of sending by grade:
    below V2 (Font. 5+): 99%
    V2 (Font. 5+): 94%
    V3 (6A+): 86%
    V4 (6B+): 69%
    V5 (6C+): 51%
    V6 (7A): 36%
    V7 (7A+): 23%
    above V7 (7A+): 9%

    Finger strength:
    Your finger strength is low. Whether you are a boulderer or a sport climber, you must work on your finger strength to make it to the next level. It’s not that bad though, taking into account that you hardly ever use the hangboard! Still, you will benefit significantly from introducing both neural and structural hangboard protocols into your training program. Consider giving Steve Bechtel’s Ladders a try.

    Upper body strength:
    Your upper body strength is slightly low compared to your finger strength. Focusing on your pull-ups and lock-offs will make you a more versatile climber, able to tackle vertical boulders on tiny holds as well as powerful roofs and overhangs.

  2. Hey just leaving a comment about my results! I’m an mech engineer that deals with a lot of statistics like this so think it’s great! big discrepancy between what i measured and what i climb but i think it might be from only climbing for about a year so far.
    grip type: Half crimp
    Height: 75 inches
    wingspan: 79 inches
    Weight: 185 lbs

    edge size: 16 mm
    hang length: 10 s
    added weight: 57.5 lbs
    Pull up module:
    50 lbs
    5 reps
    estimated climbing grade: V9
    actual climbing grade (outdoors): V4
    considering my climbing grade V4 as it’s the hardest i’ve climbed, but have also sent 3 (for a total of now 6) V4’s in the last few outdoor session. i’ve tried a few V5’s but haven’t gotten very far on any of them

    1. Hi Jeremy, thank you for the input. You seem to naturally have very strong fingers; that’s great! As you wrote, you’ve only been climbing for a year, so take it easy and focus on developing technique and climbing mileage. Don’t overdo finger strength training, and treat it more as a prehab routine to prepare your fingers for higher loads, which they may be subjected to as you progress to higher grades. Also, try to improve your upper body strength by doing pull-ups. Focus on quality; you may, e.g., do sets of five pull-ups at body weight, but make them dynamic and maintain body tension through the movement. Good luck with your training!

  3. Interesting results for me for sure. I considered myself a strong for the grade boulderer but consistently end up being weak according to this program. I’ve done 7B+ in Font and probably 7C elsewhere (hardest things I’ve done were ungraded or only graded by a handful of people) but am unable to touch that grade inside, unless it’s super soft.

    I can do one neat pull up with 12 kilos added at 70 kg bodyweight, and lift around 55 kg on a 24mm edge one handed. I used to be able to hang that edge one handed when I weighed around 60kg but not anymore. My flexibility has gotten better but I can just about reach my toes standing up if I’m warm and my shoulder rotation ends up being just under 180 degrees. I’d say that’s ok but not great by any means.

    The result I get is that I should be projecting 7A which seems about right (if a little low) for plastic but strangely low on rock. Last weekend I sent several 7A / + level boulders in one day, combined with some projecting on a new line that I’d guess is around 7C. It is for sure harder than the 7B I got on that day.

    I figure this is good news since there’s easy pickings but hard consistent work just doesn’t give me the quick dopamine that better beta or dailing in deadpoints does. 🙁

    1. Hello Tijmen, thank you for the comment. Well, I guess that shows that gym climbing and rock climbing are not exactly the same. It also depends on the area. After all, the Analyzer tests for 20 mm half crimp/chisel strength, and Font is a lot about slopers, friction, and technique. I think it would make sense to make a separate calculator for each climbing area. I heard this version is very accurate for the Shawagunks 🙂 Besides, it’s not about predicting the climbing grade exactly but helping pinpoint potential weaknesses, which, when properly addressed, can help climbers progress. Anyway, 7B+/7C is super strong, so keep crushing!

    1. Hi Jon,

      Thanks for the heads up! Which browser causes problems? It seems to work on the latest versions of Chrome and Edge.

  4. Comfortable projecting level:
    Probabiltity of sending by grade:
    below V1 (Font. 5): 99%
    V1 (Font. 5): 94%
    V2 (Font. 5+): 86%
    V3 (Font. 6A): 69%
    V4 (6B): 51%
    V5 (6C): 36%
    V6 (7A): 23%
    above V6 (7A): 9%

    Finger strength:
    Your finger strength is very low. If you are a beginner, then fine, don’t worry about it too much, you will improve as you climb. However, if you’ve already been climbing for several years, then you have a serious issue on your hands that needs to be addressed pronto! And are you’re really training with added load? Apparently, it’s not working out that well, now is it? Maybe you should build some muscles in your forearms first? Consider switching to some easy hypertrophy protocol. Try Repeaters or Hangboard Moving Hangs. Even Endurance Repeaters could prove helpful here.

    Upper body strength:
    Your upper body strength is way high compared to your finger strength. You should definitely focus on your finger conditioning to unlock your full climbing potential.

    Climber’s thoughts:
    I didn’t realize I was this weak. I have been climbing for a little over 4 years now. I am surprised with the result. I have climbed V8 outside and would like to get my first V9 this fall. I’ve always felt like I was a little weaker than my peers as I usually can’t do climbs the way they do. I had no idea it was to this extent though.
    I hangboard 2x a week and boulder 3-4 times a week.
    I can do about 105 lbs on a single arm on a 20 mil edge for about 5 seconds from a deadlift hangboard setup. I weigh 190. It’s typically pretty hard for me to hang from a 15 mil edge at body weight for more than a second or two with both hands at body weight. On a good day I can do 5 seconds though. I climb a little harder outside than I do in the gym. I guess I am an outlier; I don’t really mind though. You can always get better at technique, and I can usually think my way around really fingery cruxes. I don’t think you need insane finger strength to climb relatively hard.

    1. Hello Luke,

      Thank you for the comment. Yes, it looks like you’re a bit of an outlier, and it shows that having high finger strength is not necessary to boulder hard. However, you might be compensating for it with other qualities. For example, at 190 lbs, you’re heavier than an average climber, so I suppose you’re also quite tall. That means that some boulders could be easier for you, while others could be harder, of course.

      You boulder 3 – 4 times a week, which is a lot. That gives you confidence, good tactics, and technique. I also noticed that your upper body strength is high, which always helps. All in all, it would be interesting to see if you can improve your climbing by focusing more on finger strength development. You may find Tyler Nelson’s new methods interesting.

  5. Height: 177cm
    Arm Span: 171cm
    BW: 69kg
    One-Arm Hang: -8.4kg (Open Grip), 20mm, 10s
    Pull Up: +42.5kg 2 Reps
    Comfortable projecting level: V9/7C
    below V7 (7A+): 99%; V7 (7A+): 94%; V8 (7B+): 86%; V9 (7C): 69%; V10 (7C+): 51%; V11 (8A): 36%; V12 (8A+): 23%; above V12 (8A+): 9%

    I say the results are quite good, i recently got more comfortable by projecting 7C, but i still would say that for every percentage the grade should be dropped by 1 in my case. Mainly due to having difficulty of trying really hard on demand.

    Gret tool nevertheless, thanks mate

    1. Hi Christoph,

      Thanks for sharing your results and for the feedback! I’m glad that the tool works well for you. Regarding accuracy, so many factors influence climbing performance, such as the ability to try hard that you mentioned, that it’s impossible to be spot on every time with the prediction. Nonetheless, in most cases, the approximation is fairly close and can be valuable in designing your training programs.

  6. Height: 178
    Weight: 60
    Mode: 3
    20mm two hand: 60 added kg for 5 seconds
    Pull up: 48 added kg one rep
    Grade score 8A+
    Highest boulder climbed: 7B+
    (Front lever 5sec)
    Been stuck on 7B+ for two years 😅

    1. Hi Isak!

      Thank you for the comment. It’s hard to tell the reason for your plateau, but the Analyzer only gives the approximate probability of sending a given grade. Climbing is an extremely complex sport, and weighted hang measurements can’t cover the entire spectrum of what’s needed to boulder hard. Please take a look at this article. Maybe it’ll give you some hints regarding further training. I’ll need more information if you’d like me to take a closer look at your case. Please email me directly if you’d like more specific support.

    I would love to hear about your opinion.
    Here are the results, where does it put me according to your data when it comes to sport climbing and bouldering?
    In your opinion, what type of training should I prefer to improve rope climbing?

    My results are:
    BW: 62kg
    MVC-7: 91 Kg
    T80%: 78″
    T60%: 546″
    T45%: 1050″
    If I understood correctly, I only entered the actual suspension times. I use for test beastmaker 1000.
    Thank you

    1. Hi Emanuele,

      I looked at your data. Your finger strength is average, but your endurance is quite ok, which makes up for it.

      At this point, you’re likely able to climb in the 8a+/8b+ range, depending on the route’s character. If you want to improve quickly, you should address your finger strength first. Try to reach a stable 160% MVC-7 on a 20 mm edge. Bechtel’s Ladders could be an excellent place to start. Regular bouldering and system board training is also a good idea.

      Once you’ve improved your finger strength, you may return to address forearm endurance specifically. You may use Endurance Repeaters at Critical Force load. Currently, your CF lies at 42% MVC-7. Improving beyond 45% would give you an extra edge on longer routes.

      I hope this helps,

  8. height: 70 in
    span: 74 in
    weight: 163 lbs
    finger strength: 20mm 7s +145lbs
    pull strength: 1rep +145lbs
    calculated grade: v11
    performed grade: v13

    It is likely that I am weaker than other climbers in this grade, especially in the fingers and on smaller edges, but I believe my pull strength is above average. The difference may also be explained by the fact that I climb very technically and almost all of the V12+ problems I have sent have toehook/heelhook crux moves.

    1. Hi CW!

      Thank you for this message! Finger strength is critical, but it only gives part of the picture. It’s likely that you have very good technique and a strong core, which helps you transfer the strength you have from your fingers through the entire kinetic chain very effectively. Can you do some calisthenics exercises? Like the l-sit, front lever, handstand, or the planche? If so, that could give you a significant edge!

  9. Interesting calculator! I’ve been climbing for almost a year now, I typically send V6’s and highest grade I’ve done was V7. The calculator says I should be able to climb V10!! I think this tells me I still have lots of experience/technique to gain and my strength isn’t my weakness. I’m going to start projecting V8’s for sure (I’ve only ever tried one) and I’m definitely going to start running some technique drills, I far too often muscle my way through climbs.

    Height: 65”
    Arm-span: 68”
    Weight: 145lbs
    Mode 3 hang boarding randomly to do tests like this everyone once in a while.
    5 second hang on 20mm edge with 110lbs added weight
    1 rep pull up with 120lbs added weight.

    1. Hi Max!
      Yes, you’re definitely not weak as far as finger and pull strength is considered. Technique could be one thing, but you also might want to check if you can do some basic calisthenic exercises, like the l-sit, planche, handstand, and front lever. Working on these drills can help immensely, particularly if your core strength lags behind your finger and pull strength. It might also reveal if you have any deficits in terms of flexibility and shoulder stability.

      1. Good point! I can do many calisthenics exercises quite well, I can hold an L-sit for over 20 seconds, front lever for 10 seconds and can do hand stand pushups. I could probably work on my flexibility in general though (I don’t stretch as much as I should).

        I just built myself a climbing wall in my garage and I’m planning on getting into a more serious/steady training routine, I may update once I’ve seen some progress. I’d like to repeat some benchmark strength tests in about 3 months time and see where my bouldering grade is relative to that.


        1. Hi Max!
          Excellent – good luck with your garage climbing wall! I should build one myself 🙂 Looking forward to your updates!

  10. Very curious what calculations are used here, since I’ve climbed a couple v9s (7c) outdoors and even a crimpy 7c+ on the moonboard. The results of the calculator gave me 6c/v5 to project. I have compared my pull-ups and finger strength to power company’s metrics and am definitely in the 7b-7c+ range according to them, which actually makes sense with what I climb. I maxed out at .55 bodyweight added for 10s on rounded 20mm edge in testing. I can do 13 bodyweight pull-ups, or ~5 with .2 bodyweight added.

    1. Hi!
      I don’t know what to make of it – your results are what in my experience lies in the V5 range. 1.55 bodyweight for 10 seconds on a 20 mm edge is not a lot. The very rough consensus is that if you can hang for 5 – 7 seconds one armed on a 20 mm edge, then you should be in the V10 range – that’s pretty much right for most people. 13 bodyweight pull ups is also not a lot. No metric is perfect though – you might make up with other parameters – it’s difficult to say.

    1. Yes, that’s correct. The strength of a climber who regularly does weighted hangs will be somewhat inflated in relation to his climbing grade. Climbers who do not train regularly on the hangboard will seem weak for their grades, but they’ll quickly build a lot of strength. The algorithm takes these effects into account.

  11. Ville Kopakkala

    I think I REALLY have to learn proper techniques to Climbing. It’s been now 6 months and meantime I have improved my best ever climbed boulder from 6b > 6c.

    But on strength level I have been making some HUGE steps.

    Body weight: 90 > 86kg
    Max hang: 20mm/0kg/24s -> 20mm/48kg/8s (and also did 10s BW with 10mm edge)
    Pull-Up: /1x70kg -> 1x86kg

    Calculated Average bouldering level: 7A+ -> 8A+

    Maybe, just maybe this is not just strength-sport. 😀

    1. Hi Ville!
      Thanks for the comment. I took a look at your results, and I tried to fit in the input, which would more or less be:
      height: 190 cm, span: 190 cm.
      For the first measurement, you probably used Mode 3? This way, the result is 7A+.

      Now, I don’t know how you trained, but the progress is impressive 🙂 I suppose you used some weighted hangs training? In that case, for the second measurement, you should probably switch to Mode 1? If so, taking into account all the variables, the result would be 7C+. However, if we calculate the result for the 10 mm edge, it remains 7A+.

      How is that possible? First of all, you’re probably a tall, heavy climber, and you’re likely to do much better on burly boulders with big holds and long moves. Commonly, climbers with your body type can do V14s on big jugs and slopers but struggle to do V10s on crimps. It also has a lot to do with skin. I don’t know what type of boulders you typically project, but you should probably look for something that suits your style if you want to go for high grades.

      By the way, did you measure your strength endurance? How many Repeaters can you do at 80% MVC-7? How quickly do you recover between burns?

      Also, remember that finger strength is essential, but it’s not everything. Make sure that you don’t have issues related to posture, flexibility, and such. If you need any more help, you can write me an email.

  12. I have a question. I started to do hangboarding on a 20mm edge when lockdown hit germany in november.
    I did the lattice test for max 7 sec hang on 20mm on Nov 16th 2020. Result: BW +26KG.
    I retested every 6 weeks with good progress: BW + 26Kg -> 38Kg -> 45Kg

    So the results before hangboard training and after are:
    Weight: 72 kg
    Height: 185 cm
    Arm span: 185 cm
    Added hang load (two arms, 7 sec, 20 mm edge): 26 kg
    Training mode: Mode 4
    Calculated average bouldering grade result: V9 (7C)
    Reported maximum bouldering grade result: V7 (7A+)

    Weight: 72 kg
    Height: 185 cm
    Arm span: 185 cm
    Added hang load (two arms, 7 sec, 20 mm edge): 45 kg
    Training mode: Mode 1
    Calculated average bouldering grade result: V8 (7B+)
    Reported maximum bouldering grade result: I don’t know due to lockdown still ongoing (so still 7A+)

    It seems that by starting to do hangboarding I am now down one V grade in average bouldering grade.
    I progressed from 26Kg added to 45Kg added. Only by changing the Training mode the calculator seems to lower my suggested V grade significantly.
    How is that possible? It looks like i get worse in bouldering by getting better on the max hangboard sessions.
    Note: I’m a boulderer only. No sport climbing.

    Thank you very much!

    1. Hi!
      Thank you for this comment! The Modes of the Analyzer can only give an approximation of where you currently are in your training cycle. What I mean is that if you did another six weeks of strength training, and you reached +50 kg added load – you would still use Mode 1, but your result would become V9. In the same vein, Mode 4 does not always perfectly describe the scenario when you don’t use the hangboard at all, and it sometimes may overestimate the result – as it was in your case, I guess.

      Pulling more load does not necessarily mean that you will instantly be able to climb harder – you need to learn to apply this new strength on the rock. I think you can conclude that you’re strong enough to try problems that are harder than V7. What you need to do now is to use your finger strength in real bouldering. Once your technique and skills catch up, you will open the possibilities for further strength development.

      All in all, I think that the result you got with the Analyzer is pretty accurate and useful. A +/- 1 V-grade variation is quite good, taking into account the complexity of the modeled problem.

      Good luck with your training and climbing progress!

  13. This little app is super helpful for me.
    My data:

    height: 160
    arm span: 166
    weight: 49
    hang added load: 25
    edge depth: 23
    hang time: 7
    pull up added load: 21
    number pull ups: 1

    So I’ve been working on strength during the pandemic with a Lattice Lite plan. The gyms have been closed so I’ve done a lot more conditioning than climbing. I’m way stronger than I was in September but my technique hasn’t progressed with my strength. The gyms just opened in our area and I can really tell the difference in my strength level. Your assessment puts me comfortably projecting V6. Our gym doesn’t have V scale grades and instead has a color grades. Not everyone agrees on what the colors map to so it’s hard to say what grade I climb at. I’m fairly certain that I’m not climbing V6. However, I’ve been testing out harder climbs and find I can manage holds on some of the harder climbs in the gym now. I’m just way behind in technique so I’m struggling to figure out the beta and link moves. For me I think there are advantages to having my strength track ahead of my technique. I’m fairly new to climbing and I just turned 50. With my new strength level I can safely work lots of V4-V5s without worrying about messing up my shoulders. So yeah, as suggested by your app, time to switch gears and work on technique and endurance.

    1. Hi!
      Thank you for your comment! It’s great to hear that the app is helpful 🙂 The perfect scenario is when we can develop our physical capabilities and technical skills in parallel, but unfortunately, that’s not always the case. Being strong is great, and you’ll see dramatic improvements once your technique begins to catch up. One word of caution here, people who get strong are often capable of suddenly increasing their climbing volume, which comes with a risk of causing an overuse injury. If you’re not currently aiming for a short high-performance phase, like a comp or a trip, then consider switching to Tyler Nelson’s Density Hangs for a bit. This way, you’ll make sure that your tendons remain strong and healthy.

  14. Hi Jędrzej!

    A quick progress update now after full month in climbing (I think I did like 10 climbing sessions (1,5-2,5 hours) and one hangboard session in last two weeks). So I am grinding hard, heh. I managed now to climb much more 6c and 6b+ boulders, I even flashed one 6c yesterday.

    Stats improved:
    Weight: 90 kg -> 88kg
    Added load: 0 kg -> 36,6kg
    Hang time: 24 s -> 6 seconds
    Edge depth: 20 mm
    Mode: 3 (unmodified)

    So now without pull-ups and armspan it gives me “V8 or Font. 7B+”. Still little bit off.


    Thanks for the feedback! It gives me motivation to continue training even though we are not allowed to climb in France. I’m looking forward to the moment when the gyms will reopen, and even better, rock climbing!

  16. Hi Jędrzej ! I’m a young climber who also loves climbing. I have been following your publications for a while now and I really appreciate the quality of your work!

    Here are my numbers… but also my questions!

    Weight: 76kg (I’m ATM pretty heavy -> Performing weight around ~72/73kg
    Height: 182 cm
    Arm span: 186 cm
    Added hang load (two arms, 7 sec, 20 mm Lattice edge): +84 kg (160kg in total)
    Training mode: Mode 1
    Pull-ups added load: +88 kg (1 rep max)
    Calculated average bouldering grade result: V14 (8B+)
    Reported maximum bouldering grade result: ANY ! I’ve never done bouldering outdoors (what a shame I know) but yet, according to a good friend of mine who knows bouldering grades better than I do ( at the time he used to do a lot of competitions to get into the French team), one of the boulder (that I did) we were training on a month ago was for sure at least 8A font.
    In addition, my best reported lead climbing outdoor & indoor performances were 8b / 5.13d (2019/07/09) & 8b+/5.14a (2020/02/09). But since then, I’ve been training a lot due to the lockdown, so my questions are:

    Do you really think that if I planned to go on a Font Trip, I would succeed most of the boulders below 8A+ (99% according to the calculator). Could I expect climb an 8B boulder that suits my style in one day, even if it would be my first time bouldering outdoor (and fortunately not indoors) ?
    Honestly, I found it very surprising , but who knows ? And lastly as a lead climber in first place, what grade can I expect to climb ?

    PS: I’m a bit like a geek when it comes to breaking things down, understanding the biomechanics behind the numbers, etc…
    Plus, in a month or so, I will test and collect some date about myself : finger strength, arm strength, flexibility, endurance… to see my progress. You might be interested, so feel free to tell me about it !

    1. Hi Karl-Jean!
      Thanks for the interesting comment! Judging by the insane numbers you pull, yes, you should be capable of climbing 8A+ in Font easily. Could you expect to send an 8B that suits your style? Yes, I think so, but remember that climbing is also a skill sport, and since you don’t have any experience bouldering outdoors, it might be a steep learning curve!

      As far as lead climbing is concerned, to give you the answer, I would need to look at your endurance profile, but sport climbers at your strength level typically lead at least 8c.

      Of course, I would be thrilled to look at your data! I’m a geek myself, so I love looking at numbers! Feel free to write me an email any time 🙂 In any case, since you’re indeed young, I believe that you have an exciting climbing career ahead of you! It will be interesting to see your progress – maybe you could even send 9a+ someday? Who knows!

  17. Thank you Jędrzej for very detailed anwer. I am currently starting to train with added weight and keeping hang times low (7-10 seconds). I think I will now follow first for the Zlagboards medium program and after month in I will update my results. I think in general have acquired a good grip force for the barbell moments, which of course is not directly transferable to all climbing holds. I can deadlift 220kg hands on the smooth point of barbell (from middle) with overhand grip. And one arm deadlift with fingerlock I got 200 kilos up. I trained these one arm lifts like few weeks back then.

  18. Weight: 90 kg
    Height: 185 cm
    Arm span: 192 cm
    Added hang load (two arms, 24 sec, 20 mm edge on zlagboard competition holds): 0 kg
    Training mode: Mode 4 (tried once in my life for above test)
    Pull-ups added load: 70 kg (1 rep max) and 26kg (14 rep max)
    Calculated average bouldering grade result: V9 or Font 7c

    I have only been climbing two weeks now (top rope and bouldering). My background is 10 years of gym training, but not in last 12 months. That V9/7c sound absolute ridiculous for me. My best ever boulder (two weeks now) is FONT 6C, and multiple 6Bs. Hmm, what should I learn first by these stats?

    1. Hi Ville!
      Thank you for a very interesting comment! I studied your data, and I believe it’s a good input for discussion. First of all, this is a simplified theoretical model that is based on certain imperfect assumptions, and it has limitations.

      The core of the model is based on finger strength measurements. Many researchers tried to determine the relationship between finger strength and bouldering level accurately, yet very often, outliers occur. That’s why I decided to introduce additional parameters by trying to fit the results reported by climbers into the model. Parameters such as big height, large arm span, and high pull-up strength should all theoretically help the climber, at least on certain types of boulders, but let’s first ignore them. Let’s input:
      Height: 185 cm
      Arm span: 185 cm
      Weight: 90 kg
      Added load: 0 kg
      Hang time: 24 s
      Edge depth: 20 mm
      Mode: 3 (unmodified)

      The result is V5/6C+, which, in your case, seems accurate.
      It’s important to note here that you get better accuracy if you use shorter hang times, up to 15 seconds. For these hang times the relationship between the hang time and MVC-7 is pretty constant between climbers, e.g. 7 seconds = 100%, 10 seconds = 96%, 12 seconds = 94%, 15 seconds = 90%. Above that, it becomes more individual, so at 24 seconds, we could be looking at anything between 80 – 85% of your MVC-7.

      The rest of the parameters, such as height, arm span, and the pull-ups module, all add to your result. Typically adding this data helps fine-tune the result, but in your case, it didn’t. This could be because you’re taller than an average climber, you have a large wingspan, and your pull-up strength is pretty high, particularly for the grade that you climb.

      But it looks like the most significant inaccuracy comes from switching between Mode 4 and Mode 3, which makes a big difference in your case. It’s tough to model this and impossible to make it work for everyone, but I will take a look and try to think it’s possible to improve this.

      The sum of all these inaccuracies caused your result to be largely overestimated. However, you could learn from this that your pull-up strength is definitely high for the grade you climb – you don’t have to focus on pull-ups for now. And since you’re tall, you will do best on dynamic boulders, with holds far apart. Indeed, on crimpy boulders requiring high foot placements, your height and weight might be a hindrance.

      Since you never did any hangboard training before, you might give it a try, as you probably have a lot of finger strength potential left. You could start with regular 7/3 Repeaters at your bodyweight in half crimp position on the 20 mm Zlagboard edges – it would give you a good base for further development.

      I hope this helps a bit!

  19. Hey,
    just came here, because due to covid, i barely had any chance to climb this year.
    I have never climbed a boulder harder than 6b+, and started climbing 2 years ago, but was injured most of the time.

    I think i tend to power through boulders, only have „good technique“ on super easy climbs.

    My data is:
    170 cm tall
    70kg bodyweight
    177 cm arm span

    Just had my first hangboard session where i used both hands, instead of a crimp-bloc.
    I was able to add 25kg, but didn‘t really do it as recommended here and think, that i could get to 30kg.
    I used a 18mm edge i cut out of some wood.

    I trained weighted pull ups for a bit, because i had nothing else to do during lockdowns.. i‘m at easy 30kg+ and can easily do 4 repetitions.
    (i also can hold a front lever for a max of 14 seconds).

    My Results:
    Probabiltity of sending by grade:
    below V5 (6C): 99%
    V5 (6C): 94%
    V6 (7A): 86%
    V7 (7A+): 69%
    V8 (7B+): 51%
    V9 (7C): 36%
    V10 (7C+): 23%
    above V10 (7C+): 9%
    Which is totally surprising.. as someone who never managed to climb a 6C… And even having a probability of 50% for sending a 7B+?!?

    Does this mean, i should start regularly hangboarding, and work on my technique mainly, once climbing gyms re-open?
    I guess projecting 6C boulders might also be a good thing, to learn the techniques necessary for harder grades?

    My mind is literally bown by how weak i climb compared to my „strength“

    1. Hi Percy!
      I verified your parameters into the Analyzer. One thing you should be mindful of is the edge radius. It should be slightly rounded. The Zlagboard is roughly about 5 mm, and the Lattice Edge is 10 mm. A sharp edge could make it a bit easier. You also trained weighted pull-ups during the lockdown, which made you stronger than you were a while ago.

      But these are details, and all this aside, it does look like you’re pretty strong. I think you could definitely project something harder than 6B+. Try benchmarking your strength on the Moonboard. I think that the most important thing for you now would be to boulder more and see what you’re capable of. Still, one hangboard strength session per week could definitely help you progress. The Rock Climbing Technique book by John Kettle could also prove helpful for you at this point.

  20. Hi,

    I’ve filled in all the parameters but unfortunately didn’t get a result…

    Weight: 81 kg
    Height: 188 cm
    Arm Span: 189 cm
    Added hang load (two arms, 11 sec, 15 mm edge): 11,5 kg
    Training mode: Mode 2
    Pull-ups added load: 28,5 kg (6 rep max)
    Calculated average bouldering grade result: ?
    Reported maximum bouldering grade result: V6 (7A)

    1. Hi Stefan!

      Please use dots instead of commas for the load input 🙂
      Calculated result without pull-ups module: 7A
      Calculated result with pull-ups module: 7A+

      Looks like you have a lot of power!

  21. Hey Jędrzej!

    I have the following input parameters:
    Height [cm]: 182, Arm Span [cm]: 190
    BW [kg]: 69
    Finger strength module: Mode 1

    One-Arm Hang, Added Hang Load [kg]: 0
    Edge depth: 21 mm
    Hang time: 5 s

    Calculated Results are V12 or Font. 8A+.

    However, my max in/outdoor is 7B/7A+ with low variance over the years. I test finger strength quite frequently on a positive 21mm campus rung from euroholds. Do you think the profile of the hold could have a significant impact? The Lattice Testing Rung looks pretty similar but I don’t see any other factor that could be responsible for this large of a discrepancy.

    1. Hi Lorenz!
      This is a very interesting question, thank you! I think anyone will agree that it’s easier to hang on an in-cut edge than on a flat one. The question is, what is the exact difference? I’m not familiar with any advanced studies investigating this dependency, and it is something I would be very keen to measure precisely.

      Still, I think it’s safe to roughly assume that you could hang 15% more weight on an in-cut edge than on a flat one. That would mean that you would need to reduce your weight by 9 kg to hang one-handed on a flat 21 mm edge for 5 seconds, which would put you at 7C. What is more, you do have a relatively large wing-span that could let you climb harder than 7B in certain formations, particularly with large holds wide apart.

      Still, in all honesty, your fingers are very strong, and you have excellent parameters (height, reach, weight) to climb harder than 7B. Perhaps there is something else that limits your performance? Maybe upper body strength, power, or flexibility? It’s not easy to say with such limited data. There’s a book you might find interesting and helpful: “Rock Climbing Technique: The Practical Guide to Movement Mastery”, by John Kettle.

  22. Jon Jerntå Elvesæter

    Wow! I am amazed by this calculator! It told me I should be able to boulder font 5+. I usually flash boulders up to 7a. It was worth a try, though.

    1. Hi Jon!
      Too bad it didn’t work for you. It’s usually pretty accurate, though, and I never saw such a significant discrepancy between the actual climbing level and the calculation result. Would you mind sharing your input data? I’d like to check if there isn’t any bug related to your particular data set.

  23. Weight: 71 kg
    Height: 184 cm
    Arm span: 195 cm
    Added hang load (two arms, 7 sec, 17 mm edge): 32.7 kg
    Training mode: Mode 1
    Pull-ups added load: 43 kg (3 rep max)
    Calculated average bouldering grade result: V9 (7C)
    Reported maximum bouldering grade result: V7 (7A)
    to be fair, I have been able to train for a few months now with little to almost no climbing, and was only able to do 1 V7 boulder.
    it was hard for me to even do V5 when I started climbing again.

    1. Hi Ben, thank you for your comment! I analyzed your input. Indeed, the result is V9, so let’s see what happens here:

      First of all, you’re quite tall, and your ape index is very high. The algorithm is constructed in such a way that a positive ape gives you some additional points, based on the results of the climbharder survey mentioned in the post. A high ape index can definitely help on boulders with long reaches, so this is where you should excel.

      Second, your pull-up strength is also quite high for the grade, which gives you another bonus. It should be helpful for dynamic boulders.

      Without these bonuses, your result would be exactly V7, so if you want to score your personal best, try to look for a V9 boulder with a long dyno – this is where your strength should lie.

      If you mainly climb indoors, try to incorporate some pinch blocks training into your schedule, because indoor holds are often mainly pinches. Introducing some scapular pull-ups into your workout will help you unlock long, wide reaches and help you make the most out of your large wing-span.

      Anyway, I hope this helps:)

  24. Hi, thanks for the useful tool. Would you be able to add a sport grade to the output?
    I don’t boulder much and find the grades quite confusing.

    1. Hi Ian!
      I’m glad you like the tool! To predict your sport grade you need to also look at your endurance profile. That means that a different algorithm is required. I’ve developed such a tool, but I haven’t published it yet. Right now, I only use it to calculate the sport climbing level of the climbers following my Experimental Hangboard Training Program. To gain insight into your endurance profile, you can take a test with the Climbing Critical Force Calculator. If you send me your test results (MVC-7, T80%, T60%, T45%, and BW), I can prepare an assessment for you, evaluate your physical parameters and give you some hints regarding which aspects to improve in order to progress.

  25. How is the pull-ups module intended to be used? Pull-ups with the specified edge depth? Or from holding anything? While rested or immediately after or before a hang test?

    Thanks for your efforts!

    1. Hi Rob!
      The pull-ups test is to be done on a bar, or some comfortable jugs so that your grip strength does not influence the result. You need to be fully rested and well warmed up. It would help if you did some recruitment pull-ups before you perform the test with full added load.
      Based on the feedback I received from r/climbharder users, the pull-up strength is not a key predictor of your bouldering level – finger strength is much more critical. However, there certainly is some correlation, and the Analyzer will indicate if your pull-up strength is significantly lower or higher than what it is on average for your calculated bouldering level.

    1. Hi!
      Thanks for this comment! It’s really encouraging to know that people find the site and the apps useful! I’m currently working on improving the program based on the feedback I got in the comments.

  26. Gunter Sissoko

    A couple of thoughts on how this could be improved:

    1. Information on specific hang boards because not every 20mm edge is alike. For example: Should the bottom edge on a bm 1000 be treated like an 18mm edge or a 15mm edge? It’s not exactly comparable to an 18mm edge on a transgression board. Having information on what to input for common hangboard holds would be helpful for getting accurate data.

    2. You probably shouldn’t make a recommendation about weight loss when the only information you have is height and weight. Healthy and optimal body weights are highly individual. It’s easy to look at someone’s weight and say that they’re too heavy for climbing, but you don’t know what their body composition is, or how dieting to lose weight will affect their mental health and physical health. I’m just under 6 feet tall and typically around 195 pounds. I’m probably somewhere between 12% and 15% bodyfat when I’m at that weight, and I do have to watch my food consumption and tolerate a baseline level of hunger to maintain it (and no, I have never trained deliberately to put on muscle, I’ve been this way since high school).

    Your calculator recommends that I lose weight, but I know that it would be very unpleasant to drop down to and maintain even 185 pounds. I tested inputing a weight of 175 pounds (20 pounds lower than my actual weight), and it suggested losing an additional 22 pounds. At 153 pounds, it said that I would be at my optimum weight. That would require me to lose 40 pounds even though I’m already at a weight that is healthy for me. This sort of thing is what eating disorders are made of.

    I’m sure that I would see short term gains in my climbing with some weight loss, but would operating at 10% bodyfat all the time really be beneficial to my climbing long term? Would I recover as effectively? Would I gain strength as effectively? Would I remain injury-free? Weight loss doesn’t provide cumulative improvements in climbing ability or strength. It doesn’t help you get stronger long term, and at a certain point it actually makes it harder to improve as a climber and to keep your body healthy. Most climbers aren’t so close to the limits of their strength potential that they’ll benefit more long term from weight loss than from a healthy amount of bodyfat that will allow them to train effectively. As climbers, we’re surround by disordered eating habits and a fetishization of unhealthy body weights. I think it’s pretty unhelpful to have your training calculator tell people to lose weight with very little information about their body composition. If you’re going to make recommendations like that, you should ask for climbers’ body fat percentage, and then give recommendations based on that. Here are example of what you could say (to men – women should be at a higher body fat percentage):

    20% body fat – You carry a fair amount of excess fat. Your climbing and health would benefit from losing some weight.
    12-15% body fat – you are at a good composition for training. If you plan to go on a climbing trip or have a project, consider losing weight for short term strength gains.
    10-12% – your body fat is quite low, try to stay at or above this level while training to minimize the risk of injury and maximize your ability to build strength.
    <10% bodyfat – Your body fat percentage is very low. Your training and injury risk could benefit from some weight gain. Your body composition is optimal for sending a hard project, but it is not recommended to maintain this body fat percentage long term.

    Those are some ideas of what you might say. Disclaimer: the specific numbers are informed more by my intuition than by science, but the principles are there. The important point is that the climbing community needs training resources that encourage health weights and healthy eating habits, not blanket recommendations to lose weight with minimal information about an individual’s body composition.

    1. Hi Gunter!

      Thank you for the comments! I think you’re probably right about the weight recommendation. I thought that since I have the height and weight, I could give some more feedback to the user, but it was supposed to be just some additional and marginal comment. Instead, it became the center of everybody’s attention, and it distracted people from essential things. Until now, nobody even commented on the impact of the climber’s height and arm span on the result, can you believe it? 🙂

      Sure, it would be best to base the recommendations on body fat %, but I think that asking the user for this data would be too complicated and unnecessary. Anyway, I used BMI because the numbers were already there, but I think I will remove this module altogether because it doesn’t seem useful.

      With that said, you ask some great questions about how climbing performance is related to body fat %. Earlier this year, I experimented with a period of low carbohydrate diet and keto diet. I got inspired to do it after listening to podcasts with Neil Gresham and Dave MacLeod and reading some very interesting articles on PubMed. As a result, I lost 5 kg of weight while in a strength training cycle, so my BMI was 20, and my body fat was probably around 10%. I felt very good, actually. I managed to increase my absolute strength form 114 kg to 116 kg, and my relative strength skyrocketed to almost 190% BW on the 20 mm edge. I managed to increase my Moonboard climbing level from 7A+ to 7B while remaining injury-free. Was it pleasant? No, it was not, I like eating unhealthy stuff, but it did help my performance. Anyway, that’s just my single case, and it doesn’t have to be the same for everybody, but I think Neil and Dave might be on to something 😉

      Regarding your comment about edge depth, I could introduce a selection of edges into the app, but the improvement in the accuracy would probably be marginal. Most errors originate from other issues anyway, like e.g., insufficient warmup or recruitment. I tested my strength on a 20 mm edge with a 4 mm radius and on the Lattice Edge (10 mm radius) on the same day, and the difference in the results was 3%, which I think can be considered negligible.

      Anyway, thanks again for your comments, and please stay tuned for the upcoming content!

    2. Hey, I have some feedback. I am 190 cm and 196 ape index, I can hang +20 kg for 10 seconds on the beastmaker 1000 bottom 20 mill edges. Pull up mode off.
      I do max hangs once a week, therefore i select mode 3. And get 7B, which is my hardest sent boulder. However, if I select mode 1 – which you could argue is more accurate because I regularity do max hangs, just not twice a week, I get 6B. This feels like too big of an effect of switching between two categories that both seem equally (in)correct

      Is it possible to have more options on the hangboarding modes? Why is hangboarding once a week only an option if you mostly do repeaters?

  27. Hasan Sarp Uçar

    Weight: 67 kg
    Height: 179 cm
    Arm span: 186 cm
    Added hang load (two arms, 10 sec, 15 mm edge): 0 kg
    Training mode: Mode 4
    Pull-ups added load: 50 kg (1 rep max)
    Calculated average bouldering grade result: V7 (7A+)
    Reported maximum bouldering grade result: V5 (6C+)
    But, I have bouldered outdoors only one time.( 4 days), Been bouldering 15 months indoors.
    Max Indoor boulder grade is V7

    1. Hi Hasan!

      Thank you very much for your input! It looks like you have some serious bouldering potential! Congratulations on reaching such a high level in only 15 months! Your upper body strength is very good, so you have a solid base for further development 🙂

      Good luck with your progress!

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