Body Fat Calculator
Estimate body fat with just a tape measure.
Measure the neck below the larynx, the waist at the navel (men) or at the narrowest point (women), and the hip at the widest point (women only). The US Navy method is usually within about 3 to 4 percentage points of lab measurements.
Formula: Men: 495 ÷ (1.0324 − 0.19077·log10(waist − neck) + 0.15456·log10(height)) − 450
Results are estimates for general information, not medical or financial advice.
How it works
- Enter your values The result updates as you type.
- Switch units if needed Metric or US units, where it applies.
- Read the result Nothing is stored or sent anywhere.
FAQ
Is it free?
Yes. No account, no limits.
Is my data stored?
No. The calculation happens in your browser and nothing is sent to a server.