Body Fat Percentage Calculator

Estimate body fat percentage using the U.S. Navy measurement formula.

Sex

Weight kg

Height cm

Neck cm

Waist cm

Hip (women) cm

Fill in the fields above and press Calculate or hit Enter ↵

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Body fat estimation beyond BMI

Last updated: March 30, 2026

A body fat percentage calculator using the Navy method can provide more composition insight than BMI alone, especially for active populations.

The formula uses circumference measurements (neck, waist, and hip for women) plus height to estimate body fat percentage and lean mass.

While still an estimate, it is a useful trend-tracking tool between more precise assessments.

Frequently asked questions

Is body fat % better than BMI?

Often yes for composition context, because it estimates fat proportion rather than only weight relative to height.

What measurements do I need?

Height, neck, waist, and for women also hip measurement are used in the Navy method.

Is this medically exact?

No. It is an estimate. DEXA and clinical methods are more precise.