Body Fat Calculator (Navy Method)
Body Fat Calculator estimates your body fat percentage using the US Navy circumference method. Enter your height, neck and waist circumference (plus hips for women), and it calculates your body fat %, fat mass and lean body mass.
Last updated: July 2026
A body fat calculator estimates your body fat percentage from a few measurements using the US Navy circumference method. All processing happens in your browser.
How to use Body Fat Calculator (Navy Method)
- Enter your height, neck circumference and waist circumference (and hip circumference for women).
- Choose your gender for the correct calculation.
- Read your estimated body fat percentage, fat mass and lean mass.
Frequently asked questions
How accurate is the Navy method?
The Navy method has an accuracy of ±2–3% compared to DEXA scans when measurements are taken correctly.
What measurements do I need?
Height, neck circumference, waist circumference and hip circumference (women only).
Is my data stored?
No — all calculations run in your browser; nothing is saved or transmitted.
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