Body Fat Calculator

Estimate body fat percentage using the U.S. Navy circumference method with category guidance.

Sex

Height (cm)

Neck (cm)

Waist (cm)

Estimated body fat

10.6%

How it works

Measure neck at the narrowest point, waist at the navel, and hip at the widest point — all in centimeters.

Stand relaxed, tape snug but not compressing skin. Consistent technique improves repeatability.

Calculate Body Mass Index and see your weight category.

Estimate basal metabolic rate and daily calorie needs.

Estimate a healthy target weight based on height and sex.

Estimate daily water intake based on weight and activity.