Somatotype Calculator
A rough ectomorph, mesomorph, or endomorph estimate from height and wrist circumference.
Step 1 of 5
Which units do you measure in?
How it's calculated
Ratio = height ÷ wrist circumference, same units. A higher ratio (thin wrist relative to height) reads toward ectomorph; a lower ratio reads toward endomorph.
| Person | Height | Wrist | Ratio | Frame | Result |
|---|---|---|---|---|---|
| Jordan (female) | 65" | 6.25" | 10.40 | medium | Mesomorph |
| Taylor (male) | 70" | 7" | 10.00 | medium | Mesomorph |
Frame-size cutoffs
| Sex | Small frame (ectomorph) | Medium frame (mesomorph) | Large frame (endomorph) |
|---|---|---|---|
| Women | ratio > 10.9 | 9.9–10.9 | ratio < 9.9 |
| Men | ratio > 10.4 | 9.6–10.4 | ratio < 9.6 |
Keep going
- Frame size and body shape are measuring different things; the full wizard covers the bust/waist/hip proportions this estimator doesn't touch. Body Type Calculator for Women
- A wrist measurement taken too loosely skews the frame-size read toward 'small' -- the measurement guide covers where and how snug to measure. How to Measure Bust, Waist, and Hips
Frequently Asked Questions
Is this Sheldon's actual somatotype method?
No. William Sheldon's original 1940s method scored photographs across multiple anthropometric measurements. This is a popular shorthand built on a single wrist-to-height ratio, common on fitness and apparel-sizing sites -- much simpler, and much rougher.
Why wrist circumference specifically?
Wrist size relative to height is a commonly used proxy for skeletal frame size, because it's largely unaffected by body fat or muscle gained through training -- unlike, say, a bicep measurement.
Can my somatotype change?
Frame size (bone structure) is essentially fixed in adulthood, so this specific estimate won't move much. Real body composition -- how much muscle and fat you carry -- changes constantly and isn't what this calculator measures.
Is this a scientific or medical classification?
No. Treat it as a rough starting point for thinking about frame size, not a diagnosis or a fitness prescription.