BMI Calculator
Calculate adult body mass index from weight and height.
Health & fitness
Health & fitness
Body Fat Calculator
Get a rough body fat estimate from body measurements using the U.S. Navy method.
Enter your values
Your result
Estimated body fat
17.007719%
- Calculation method
- U.S. Navy equation
- Result type
- Approximate estimate for adults
An estimate based on your inputs. Review the assumptions and method below.
How does this calculator work?
The U.S. Navy method uses height and body circumferences to estimate body fat. Use a flexible tape without compressing the skin, and repeat measurements to reduce error.
The formula
Male: 86.010×log10(abdomen−neck) − 70.041×log10(height) + 36.76. Female: 163.205×log10(waist+hip−neck) − 97.684×log10(height) − 78.387. Measurements are converted to inches before calculation.
What should you know?
- An adult estimate, not a diagnostic measurement or a substitute for professional assessment.
- For males, measure the abdomen at the navel. For females, use the natural waist and widest part of the hips. Measure the neck below the larynx.
- Fat distribution and tape accuracy may cause results to differ from clinical or device measurements.
Common questions
Why is hip circumference required only for the female equation?
The female equation uses waist, hip and neck circumferences. The male equation uses abdomen and neck circumferences, so its hip input is hidden and is not used.
Why are some measurements rejected?
The circumference difference must be positive. Results outside 0–75% are rejected as unsuitable estimates for this method.
Sources and verification
How do we choose formulas and check results?
Sources explain the method or its limits; they do not imply that the linked organizations endorse this calculator.