Body Fat Percentage Calculator

Calculator

US Navy method: body fat estimated from height, neck, waist, and (for women) hip. Measure in cm at the narrowest/widest points.

Sex

Heightcm

Neck circumferencecm

Waist circumferencecm

Result

Estimated Body Fat

13.7%

What Is Body Fat Percentage?

Body fat percentage estimates how much of your body weight is fat rather than lean mass. It can add context to weight or BMI, but any tape-measure estimate has measurement and formula limitations.

The US Navy Method for Estimating Body Fat

This calculator uses the US Navy tape-measure method to estimate body fat from a few circumference measurements. It does not replace a clinical assessment or a direct measurement method.

Men: Requires height, neck circumference, and waist circumference (measured at the navel).
Women: Requires height, neck, waist (at the narrowest point), and hip circumference (at the widest point).

Accuracy and Usage of this Body Fat Calculator

Results can differ from DEXA, hydrostatic weighing, or other methods. Repeating measurements under similar conditions may make the numbers more useful for tracking a trend, but a change does not prove a specific change in muscle or fat. This is an estimation tool, not medical advice.

How To Use the Body Fat Percentage Calculator

Select your biological sex (male or female).
Enter your height in centimeters, and then your neck and waist circumference in centimeters.
If you are female, also enter your hip circumference in centimeters.
Ensure measurements are taken accurately: neck at the smallest point, waist at the navel (men) or narrowest point (women), and hips at the widest point.
The body fat percentage calculator will display your estimated body fat percentage and categorize your fitness level.
Use the Example button to load sample values, or Reset to clear all fields for a new calculation.

US Navy body fat estimate

Use the US Navy body fat calculator when you want a tape-measure estimate from height, neck, waist, and, when applicable, hip measurements. Repeat measurements consistently if you are tracking a trend, and do not treat the estimate as a clinical measurement.