Body Fat Calculator

Estimate your body fat percentage using the US Navy tape-measure method. Requires waist, neck, and height measurements (plus hip for women).

Measure at navel level

Measure below the larynx

Measure at widest point

Estimated Body Fat
Category

US Navy Formula

Male: BF% = 495 / (1.0324 - 0.19077 x log10(waist - neck) + 0.15456 x log10(height)) - 450
Female: BF% = 495 / (1.29579 - 0.35004 x log10(waist + hip - neck) + 0.22100 x log10(height)) - 450

All measurements in centimeters. The US Navy method was developed for military fitness assessments and provides a reasonable estimate without specialized equipment.

Disclaimer: This calculator is for informational purposes only and is not medical advice. The US Navy method is an estimation -- results may vary depending on body type. Consult a healthcare professional for accurate body composition analysis.

How to Measure

Waist
At navel level, relaxed, after exhaling normally
Neck
Just below the larynx (Adam's apple), tape sloping slightly downward at front
Hip (women only)
At the widest point of the buttocks