Health & fitness
Body Fat Calculator
Estimate body-fat percentage, fat mass, and lean mass using the Navy tape-measure formula.
Interactive calculator
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.
About this calculator
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.
Method and limitations
This calculator uses the formula and assumptions described on this page. We do not claim independent professional review. Direct references will be listed here when they support a specific rule or data source used by this calculator.
Results are estimates for general information. Verify current rules and assumptions before making financial, tax, or health decisions.
Read our Editorial and Verification Policy →Related calculators
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