Body Fat Calculator

Formula

U.S. Navy circumference equation

Worked example

Male 175cm, neck 40cm, waist 90cm — about 20.5%

Quick answer

What does the Body Fat Calculator do?

Estimate body-fat percentage using the U.S. Navy circumference method.

What is the Body Fat Calculator?

Estimate body-fat percentage using the U.S. Navy circumference method. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula U.S. Navy circumference equation. Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

Male 175cm, neck 40cm, waist 90cm about 20.5%

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.