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Estimate body fat from circumference measurements using a practical tape-measure method.
Use this army body fat calculator to estimate body-fat percentage from neck, waist, height, and optional hip measurements with a simple field-ready method. 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 profile: 180 cm, neck 39 cm, waist 86 cm. Inputs used: gender: male, height: 180, neck: 39, waist: 86. Example result: 16.1%. This circumference-based profile produces an estimated body-fat value of 16.1%. Scenario 2: Female profile: 168 cm, neck 33 cm, waist 76 cm, hip 98 cm. Inputs used: gender: female, height: 168, neck: 33, waist: 76, hip: 98. Example result: 28.1%. For this profile, the circumference method produces a body-fat estimate of 28.1%.
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 body fat calculator, body fat percentage calculator, bmi calculator, and bmr 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.
