Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy tape-measurement method — no special equipment needed, just a flexible measuring tape.

Runs entirely in your browser — nothing you enter is sent to a server or stored.

Sex

Height cm

Neck Measured below the larynx

Waist Measured at the navel

16.4%

Fitness

How to measure

Neck: measure just below the larynx (Adam's apple), tape sloping slightly downward to the front.
Waist: measure at the navel, relaxed, not sucking in.
Hip (women only): measure at the widest point of the hips.

This method is an estimate, not a lab-grade measurement (like DEXA or hydrostatic weighing) — accuracy typically falls within a few percentage points for most people.

Not medical advice. This calculator provides a general estimate for informational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider for an accurate body composition assessment.