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Body Fat Calculator
Estimate body-fat percentage, fat mass, and lean mass using the Navy tape-measure formula.
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Estimate body fat with the Navy formula
Use body measurements and body weight to estimate body-fat percentage, fat mass, and lean mass. This is a screening estimate, not a medical test.
Results
Body fat percentage
16.9%
Category
Fit range
Fat mass
13.2 kg
Lean mass
64.8 kg
How to use it
- 01Select sex and enter height, body weight, neck, and waist measurements.
- 02Add hip measurement when using the female formula.
- 03Review estimated body-fat percentage along with fat mass and lean mass.
Result guide
- The result is a screening estimate rather than a clinical measurement.
- Fat mass and lean mass are derived from the estimated body-fat percentage and body weight.
- Consistent measuring technique matters if you are tracking changes over time.
Why this page matters
Body-fat pages are popular because BMI alone cannot distinguish fat mass from lean mass. Users often want a second screening metric that feels closer to body composition.
The tape-measure approach is still an estimate, but it is practical for at-home use and much easier to repeat than lab-based methods.
Frequently asked questions
Is this more useful than BMI?
It answers a different question. BMI compares weight to height, while this estimate tries to approximate body-fat percentage from measurements.
Why does the female formula need hip measurement?
Because the standard Navy method uses a different circumference relationship for the female estimate.
Should the result be treated as exact?
No. It is best treated as a practical estimate and trend-tracking tool rather than a precise diagnostic measurement.
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