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Estimate your body fat percentage using body measurements.
Estimate your body fat percentage using the U.S. Navy body fat formula. Enter your neck, waist, and hip (women only) measurements along with your height to get an estimate. The calculator is designed to give a fast answer, but the quality of the answer still depends on accurate inputs and a clear idea of what decision you are trying to support.
- Enter Gender, Height, and Neck Circumference using the same units you plan to compare or report.
- Add Waist Circumference and Hip Circumference and review the inputs before calculating.
- Read the main body fat first, then use the supporting outputs to understand the trade-offs behind that result.
- Compare your numbers with the worked examples below if you want a quick reasonableness check.
The result estimates body fat percentage from body measurements and places it inside a general fitness category so the number is easier to interpret. On this page, the primary output is body fat.
Scenario 1: Male, 175 cm, neck 38 cm, waist 85 cm. Inputs used: gender: male, height: 175, neck: 38, waist: 85. Example result: 16.9%. A male with these measurements has an estimated body fat of 16.9%, which falls in the fit range.
Core formula: U.S. Navy method based on logarithmic body measurements. Body fat is estimated from neck, waist, height, and optionally hip measurements. The formulas differ for men and women.
- This is an estimate, not a medical diagnosis.
- Consistent measurements matter more than one-off precision.
Use this calculator when you want a more body-composition-oriented metric than BMI and you can take body measurements consistently. Related paths for follow-up analysis include bmi calculator and calorie calculator.
Most bad outputs come from a few repeated input errors or interpretation mistakes. Use this short checklist before relying on the result.
- Using inconsistent tape placement from one measurement session to the next.
- Entering hip measurements for male calculations or skipping them for female calculations when needed.
- Reading the estimate as a lab-grade measurement instead of a directional tool.
