Example: Sex: Male · Height: 70 in · Neck: 15 in · Waist (at navel): 34 in → Body fat: 17.5%.
Method: U.S. Navy circumference formula
Fitness range: 14–17% (fit), 6–13% (athlete)
Frequently asked questions
How do I calculate body fat? Enter your numbers above and the result updates instantly. For example: Sex: Male · Height: 70 in · Neck: 15 in · Waist (at navel): 34 in → Body fat: 17.5%.
Is this Body Fat Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for body fat. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.