Body Fat Calculator
Estimate your body fat percentage from a few simple measurements, using the US Navy method. All you need is a tape measure.
Body Fat Calculator
Body fat percentage from simple measurements (US Navy method).
The US Navy method estimates body fat from tape measurements — a practical guide, not a clinical measurement.
More health calculators
BMIBMI CalculatorBMRBMR CalculatorCALCalorie CalculatorIBWIdeal Weight CalculatorPROProtein Intake Calculator
Need another tool?
Browse all ten health calculators — calories, sleep, protein and more.
How to use this calculator
Choose your gender, enter your weight and height, then measure your waist at the navel and your neck just below the Adam's apple. Women also add a hip measurement. Press Calculate for your body fat percentage, fat mass and lean mass.
Formula
US Navy method. Women: 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387. Measurements are in inches in the original formula — this calculator converts your centimetres automatically.
Frequently asked questions
What is a healthy body fat percentage?
For men, roughly 14–17% is fit and 18–24% is average; for women, roughly 21–24% is fit and 25–31% is average. Essential fat is about 2–5% for men and 10–13% for women.
How accurate is the US Navy method?
Within a few percentage points for most people, but it is less accurate than clinical methods such as DEXA. Measure carefully and consistently for the best results.
Why is BMI not enough?
BMI only uses weight and height, so it cannot tell muscle from fat. Body fat percentage measures the actual proportion of fat to lean tissue.