Body Fat Calculator

Estimate your body fat percentage, fat mass and lean mass from simple tape measurements.

How this calculator works

The US Navy method estimates body fat from height and tape measurements of the neck and waist (plus hips for women) using logarithmic formulas. Categories follow the American Council on Exercise ranges.

Frequently asked questions

How accurate is the Navy body fat method?

It is a convenient estimate, usually within a few percentage points of DEXA scans for many people, but not exact.

Estimates only. Tape-measure methods can be off by several percentage points.