Quick Answer — How Grip Strength Is Measured and Compared
Grip strength is measured with a hand dynamometer, squeezed as hard as possible with the elbow bent at ninety degrees and the arm unsupported. Take three attempts per hand with a rest between each, and use the best reading. The result is a single-hand figure in kilograms, and that is what the reference tables are built from.
Reference bands vary by age and sex. A few from the published table:
- Men 25–29 — reference band 37.7 to 57.5 kg
- Men 30–34 — 36.0 to 55.8 kg
- Men 65–69 — 28.2 to 44.0 kg
- Women 25–29 — 25.6 to 41.4 kg
- Women 45–49 — 18.6 to 32.4 kg
- Women 65–69 — 15.4 to 27.2 kg
A man of 34 recording 48 kg sits within the band for his age group, about 61% of the way across it and 4.6% above the band midpoint of 45.9 kg. Those bands are wide because real populations are wide, and a reading anywhere inside one is unremarkable in the literal sense.
The second number worth having is relative grip strength — grip divided by bodyweight. That same 48 kg reading on an 82 kg body is 0.59 kg per kg, and it is the figure that makes readings comparable between people of very different size.