ZovaTool

Body Type Calculator

Somatotype
Ectomorph
Frame size
Medium
Height/Wrist ratio
10.47
Lean, narrow shoulders, hard to gain muscle. Train heavy with progressive overload, eat in surplus.
McCallum ideal measurements (wrist-based)
Chest110.5 cm
Waist77.3 cm
Hips93.9 cm
Thigh58.6 cm
Neck40.9 cm
Arm39.8 cm
Calf37.6 cm
Forearm32.0 cm

How to use the Body Type Calculator

  1. Measure your wrist circumference at the narrowest point.
  2. Enter height.
  3. Read somatotype (Ecto/Meso/Endo), frame size and McCallum ideal measurements.
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Somatotypes and frame size

Sheldon's somatotype model (1940s) classified people as ectomorphs (lean), mesomorphs (athletic) or endomorphs (rounder). Most people are blends.

Wrist-to-height ratio is a simple proxy for skeletal frame: ectomorphs have narrow wrists relative to height, endomorphs broad.

McCallum's wrist-derived ideal measurements (chest = 6.5 × wrist, etc.) are a classic bodybuilding target popularised in the 1960s.