Body Fat Estimate Calculator

U.S. Navy circumference method

Enter each measurement in metric or imperial units. Fields stay in sync. Hip is required for female estimates and ignored for male estimates.

Sex

Height (cm)

Height (in)

Whole feet and inches —

Neck (cm)

Neck (in)

Waist (cm)

Waist (in)

Hip (cm)

Hip (in)

Estimated body fat —

General category —

U.S. Navy equations use circumferences and base-10 logarithms. Inputs can be cm or inches; units are auto-converted and results are equivalent.

Body-fat categories vary by source and age. Use this as a rough estimate, not a clinical diagnosis.