Strength · Grip & muscle function

Grip strength calculator

Enter your best handgrip reading and your sex. We score it as a T-score against the British life-course norms (Dodds 2014) — how many standard deviations you sit from the young-adult peak — with the matching percentile and the clinical weakness cut-point.

Grip strength

T-score vs young-adult peak

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SD from the peak mean

Percentile

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of healthy young adults

Of peak

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of the age-32 mean

Weakness screen

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cut-point

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This is a math estimate, not medical advice. A grip T-score is a screening signal, not a diagnosis. Low grip strength is one of three criteria for sarcopenia (alongside muscle mass and physical performance, per EWGSOP2); a reading near or below the cut-point is a reason to re-test and, for an older adult, to talk to a clinician — not a verdict on its own. Field readings vary with the dynamometer, grip-span setting, posture, and which hand you test.

How the math works

The score is a T-score: how many standard deviations your reading sits from the sex-specific young-adult peak grip. The peak mean (SD), measured at about age 32, comes from Dodds et al. 2014 — a pooled analysis of 60,803 grip measurements from 49,964 people across 12 British studies. Men peak at 51.9 (9.9) kg; women at 31.4 (6.1) kg.

T-score = (grip − peak mean) ÷ peak SD men: (grip − 51.9) ÷ 9.9 peak 51.9 kg (114.4 lb), SD 9.9 kg (21.8 lb) women: (grip − 31.4) ÷ 6.1 peak 31.4 kg (69.2 lb), SD 6.1 kg (13.4 lb) weak grip = 2.5 SD or more below the peak mean (Dodds 2014): men: 51.9 − 2.5 × 9.9 = 27.15 kg → published cut-point <27 kg (<59.5 lb) women: 31.4 − 2.5 × 6.1 = 16.15 kg → published cut-point <16 kg (<35.3 lb)

A T-score of 0 is the young-adult peak. Negative means below it. The percentile reads the T-score against that young-adult distribution, which the standard-deviation framing treats as approximately normal — so it's a percentile of healthy young adults, not of people your own age. The weakness cut-points (men <27 kg, women <16 kg) are the 2.5-SD point rounded, and are the figures Dodds 2016 and the EWGSOP2 sarcopenia criteria use.

Worked example

A man records a best grip of 99.2 lb (45 kg) across three squeezes, and a woman records 39.7 lb (18 kg). Scoring both against the Dodds 2014 peaks:

Man, 45 kg (99.2 lb): T = (45 − 51.9) ÷ 9.9 = −0.70 — about the 24th percentile of young adults, 86.7% of the peak, and well above the 27 kg cut-point. Below median, nowhere near weak.
Woman, 18 kg (39.7 lb): T = (18 − 31.4) ÷ 6.1 = −2.20 — about the 1.4th percentile of young adults, 57.3% of the peak, still above the 16 kg (16.15 kg exact) cut-point. Far below the young peak, but not weak by the Dodds line.

When this calculator is wrong

The 27 kg / 16 kg "weak grip" line isn't a measured threshold — it's the young-adult peak minus 2.5 standard deviations, so it moves with the population and the dynamometer it was fitted on. From the British peak mean, men's line is 51.9 − 2.5 × 9.9 = 27.15 kg, rounded to the published <27 kg. Feed the identical method a different reference and it shifts: the German National Cohort re-derives a men's cut-point near 29 kg on its own larger sample. Same hand, same method, a ~2 kg swing — so a 28 kg reading is "not weak" by the British line and "weak" by the German one. Grip is a continuum, not a cliff.

It compares you with a 32-year-old, not with your age group. The T-score is deliberately age-independent. A healthy 70-year-old will score well below the young peak without being weak — grip declines from the ~age-32 peak, and 23% of men and 27% of women are weak by 80. For "how do I rank among people my age," this isn't the number.
The reading depends on the protocol. Dynamometer model, grip-span setting, seated-vs-standing posture, and which hand all move the number by a few kg. Dodds pooled Jamar and Smedley devices; a different device or a bad setup shifts your reading relative to the norm.
It's a screen, not a sarcopenia diagnosis. Low grip is one of three EWGSOP2 criteria. A single reading near the line warrants a re-test and, for an older adult, a clinician — not a conclusion.

What to do with the result

Test the same way each time — same dynamometer, same grip-span setting, seated with the elbow at 90°, best of three squeezes per hand — and track the trend, not one reading. A T-score climbing over months under matched conditions is a real gain; a single number against a stranger's is noise. If you're above the cut-point, grip is a cheap proxy you can re-check quarterly. If you're at or below it, re-test on another day first; if it holds and you're an older adult, raise it with a clinician, who can look at muscle mass and a chair-stand or gait-speed test alongside it. To build it, train it directly — heavy carries, deadlifts and holds, or a gripper — rather than chasing the dynamometer number.

Common questions

What is a good grip strength?: Against the Dodds 2014 norms, the young-adult peak mean is about 51.9 kg (114 lb) for men and 31.4 kg (69 lb) for women. A T-score of 0 is that peak; anything above −1 is within a standard deviation of it. The health-relevant floor is the weakness cut-point: below 27 kg (59.5 lb) for men, 16 kg (35.3 lb) for women.
What counts as weak grip strength?: Dodds defines weak as 2.5 or more standard deviations below the young-adult peak mean, which rounds to below 27 kg (59.5 lb) for men and below 16 kg (35.3 lb) for women. Those are the cut-points the EWGSOP2 sarcopenia criteria use for case-finding in older adults.
Does grip strength decline with age?: Yes. Grip peaks at about age 32 and falls from there, which is why this T-score compares you with the young-adult peak rather than your own age band. By age 80, 23% of men and 27% of women fall below the weakness cut-point.
Is the percentile for my age?: No. The percentile here is against healthy young adults (the age-32 reference), because that's what the T-score and the clinical cut-point are built on. A per-age percentile needs the full age-by-age reference table; the defensible, health-relevant read is the T-score and whether you're above the age-independent cut-point.
Which hand should I measure?: Test both and take the higher reading, as the Dodds studies did. Record the same way each time — the same dynamometer and grip-span setting — so your trend is comparable.
Can one hand's grip predict overall strength or health?: Grip tracks whole-body strength and is a useful, cheap marker, but it's a proxy, not a full picture. It's used in sarcopenia screening precisely because it's quick — not because it replaces measuring the thing you care about.