What this page is
Grip Age™ is WDHC's training benchmark. It estimates how your hang compares to adults your age and sex. A lower Grip Age means a younger grip relative to your chronological age. It is not a medical diagnosis and it does not change leaderboard rank. Rank is always hang time.
An optional dynamometer reading (max squeeze) can turn the score from Estimated into Measured. Hang endurance and max grip often agree. When they split, that is a useful signal: endurance specialist vs strength specialist, not a broken formula.
Board snapshot
Open-board counts from the live athlete file on 22 Sep 2026. We will refresh this when the board moves in a meaningful way.
Dynamometer readings are optional on submit. We do not yet have enough paired hang + dynamometer files to publish a calibration table. Hang time still ranks the board.
Three Grip Age readings (v1.16)
Athletes who add a dynamometer get three numbers. The official public score is the Measured blend. Hang-only athletes see Estimated only. Source: js/grip-age.js v1.16.
1 - Hang-Estimated
Hang time only. Expected hang from age, sex, bodyweight, height, and training. Label: Estimated.
2 - Dynamo Bio
Dynamometer only. Inverse lookup against NHANES-shaped adult grip norms (NIH Toolbox / Wang 2018 peaks). Training does not adjust this path.
3 - Measured Blend
Official score when a dynamometer is present: 82% Dynamo Bio + 18% hang modifier, then capped. Label: Measured.
Worked examples (v1.16)
Every row was run through the live Grip Age function. Inputs are listed under the profile. Gap = Hang-Estimated minus Dynamo Bio. Negative gap means the hang looks younger than the squeeze.
| Profile | Hang-est. | Dynamo bio | Measured | Gap |
|---|---|---|---|---|
| Aligned elite | 18 | 18 | 18 | 0 |
| Typical hang + typical dyno | 33 | 27 | 28 | +6 |
| Average hang + strong dyno | 25 | 18 | 19 | +7 |
| Long hang + weak dyno | 20 | 73 | 64 | -53 |
| Short hang + strong dyno | 31 | 18 | 20 | +13 |
| Endurance specialist | 20 | 46 | 42 | -26 |
| Strength specialist | 37 | 18 | 21 | +19 |
| 55-year-old, below average | 52 | 55 | 54 | -3 |
| Woman, intermediate hang | 23 | 25 | 25 | -2 |
Takeaway: When hang and squeeze tell the same story, the three scores sit close. Large gaps mark phenotype splits worth watching. Adult Grip Age floors at 18.
Run the same examples in the calculator · How to measure grip strength
Roadmap
Phase 1 - Paired files
Collect optional dynamometer readings with hang + demographics. Publish a paired N here once it is large enough to be honest. We are not there yet.
Phase 2 - Convergence model
Re-fit hang-only coefficients against Dynamo Bio. Target: median absolute gap under 5 years for general-population profiles.
Phase 3 - Phenotype notes
Separate endurance-biased vs strength-biased athletes. Publish simple normative tables by age, sex, and training.
Contribute
Add a dynamometer reading on submit if you have one. It is optional for rank. It is the only way the Measured path improves.
Background reading
Grip Age™ is a training benchmark, not a medical diagnosis. See the medical disclaimer. Public science context:
- Perna et al., 2016. NHANES 2011-2012 muscular grip strength estimates of the U.S. population. J Strength Cond Res. PMID 26196662.
- Leong et al., 2015. Prognostic value of grip strength: PURE study. Lancet 386:266-273. PMID 25982160.
- Bohannon, 2019. Grip strength: an indispensable biomarker for older adults. Clin Interv Aging 14:1681-1691. PMID 31631989.
These papers motivate why grip is worth tracking. They do not validate Grip Age as a clinical tool. Hang time still decides board rank.