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Online Body Fat Calculator

Estimate your body fat percentage with the U.S. Navy method, using height, weight, waist and (for women) hip and neck measurements. A fuller picture of body composition than BMI alone.

Sex Units

Result:

Estimate only — for fitness tracking, not medical diagnosis. Results vary by body shape.

Tool Features

Estimate body fat % with the Navy method
Separate formulas for men and women
Metric and imperial units supported
Pair with BMI for context
No registration or software installation

Common Usage

Track body composition while training
Compare against BMI for context
Set realistic fitness targets
Monitor progress without a scale alone