Body Fat Calculator (US Navy)
Estimate your body fat percentage using a widely referenced circumference method.
Your inputs
Use centimeters for all body measurements.
Your result
Your estimate using the selected measurement method.
How It Works (US Navy Method)
The US Navy method estimates body fat based on circumference measurements. It uses logarithmic relationships between height and girths.
- Male: 495 / (1.0324 − 0.19077·log10(waist − neck) + 0.15456·log10(height)) − 450
- Female: 495 / (1.29579 − 0.35004·log10(waist + hip − neck) + 0.22100·log10(height)) − 450
How to Measure
- Height: barefoot, upright posture
- Neck: just below the larynx, tape slightly angled downward in front
- Waist: at navel level for males; narrowest waist for females
- Hip (females): at the widest part of the buttocks
Notes & Limitations
- Hydration and measurement technique affect results
- Consider taking 2–3 measurements and averaging
- For athletic or atypical body types, method may under/over estimate