04 / 07 Free fitness calculator

Body Fat
Calculator

Estimate body-fat percentage using the circumference-based U.S. Navy method.

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cm
Used to adjust the estimate for body size.
cm
Measure just below the larynx with the tape level.
cm
Measure relaxed and without pulling the tape tight.
cm
Measure the widest point; not used in the male equation.

● Calculations happen on your device. Nothing is uploaded.

Result04

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Understand your result

What each number
actually means.

The U.S. Navy method uses height, neck, waist, biological sex, and hip circumference for women.

01

Body-fat estimate

The estimated proportion of total body mass that is fat tissue, shown as a percentage.

02

Circumferences

Measure relaxed and level, at the same time of day, for consistent tracking.

03

Trend over precision

Tape formulas have individual error. Repeated measurements are more useful than one result.

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Good to know

A useful estimate.
Not a diagnosis.

Use the result as a planning baseline, track your real-world response, and adjust over time. Individual needs can vary.