Where should I measure my waist?

For this method, measure around the abdomen at the navel while keeping the tape level.

Is this as accurate as a clinical scan?

No. Tape-measure estimates can differ from DEXA, hydrostatic weighing, or other clinical methods.

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Body Fat Calculator

Use height, weight, and circumference measurements to estimate body composition without uploading personal data.

Last updated: August 29, 2026

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Health information notice

Health calculator outputs are informational and should not be treated as diagnosis or treatment guidance.

If the result could affect medication, nutrition, exercise intensity, or care decisions, validate it with a qualified professional.

Interactive tool

The live form, validation, and result state for Body Fat Calculator load after the page scripts run. The content below summarizes how the tool works and links to related pages in the catalog.

Estimate body-fat percentage, fat mass, and lean mass from circumference measurements using the U.S. Navy method.

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How to use Body Fat Calculator

1
Enter your inputs into the Body Fat Calculator form.
2
Adjust optional settings so the scenario matches your real-world case.
3
Review the result, then tweak one variable at a time to compare outcomes.
4
Keep your best scenario as a baseline for future decisions.

Health and pregnancy tools are informational only. For diagnosis or treatment, rely on licensed clinical guidance.

Best use cases

Quickly evaluate body fat calculator decisions without switching tools.

Create quick estimates to support day-to-day nutrition or fitness planning.

Track how changes in activity, intake, or body metrics affect your targets.

Run side-by-side scenarios to choose a more realistic pace toward your goal.

How it works

Estimate body-fat percentage, fat mass, and lean mass from circumference measurements using the U.S. Navy method.

body fat calculatornavy body fatbody fat percentagelean massfat mass

FAQ

The calculator uses the circumference-based U.S. Navy method.

Tips for better results

Enter current values as accurately as possible for better estimates.
Recalculate regularly as your body metrics and activity change.
Use outputs as educational guidance, not a clinical diagnosis.

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