Body fat calculator
Estimate your body fat percentage with a tape measure, using the U.S. Navy method.
How to useWhat's my body fat percentage?
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Body fat calculator: what it is for
The calculator estimates body fat percentage using neck, waist and, for women, hip measurements, with the U.S. Navy method.
With your weight, it also shows how many kilograms are fat mass and lean mass.
How to use
- Choose your sex and enter height and weight.
- Measure neck, waist and hips with a tape.
- See the percentage and classification.
When to use it
- Tracking progress in training.
- Going beyond BMI.
- Measuring at home without a bioimpedance scale.
Frequently asked questions
How do I measure?
Use a tape measure without squeezing. Neck: just below the Adam's apple. Waist: men at navel height, women at the narrowest part. Hips (women): at the widest part of the buttocks.
Is it accurate?
It's an estimate with a margin of error of 3 to 4 points. Bioimpedance, skinfold measurements by a professional or DEXA are more accurate.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.