Body Composition
Body Fat Calculator
Estimate body fat percentage from body measurements using the U.S. Navy circumference method.
How to Read Your Result
Circumference-based body fat estimates are convenient, but they are still estimates. Measurement technique, hydration, and body shape can shift results.
Measure at the same time of day and use a soft tape measure.
For men, the Navy method uses height, neck, and waist. For women, it also uses hips.
Use trends over time rather than obsessing over one reading.
Frequently Asked Questions
Is this more useful than BMI?
It measures a different thing. BMI screens weight relative to height; body fat estimates composition.
How accurate is the Navy method?
It is practical for tracking trends but less precise than DEXA, BodPod, or skilled skinfold testing.
Where should I measure waist?
Measure around the abdomen at a consistent point, usually near the navel, without compressing the skin.