Body Fat Estimate Calculator
Estimate adult body fat from height and circumference measurements using a Navy-style body-density equation.
Your results
- Estimated body fat
- 20.07%
Calculations run in your browser. Results are estimates where described below.
How the calculation works
Male density = 1.0324 − 0.19077 log₁₀(waist − neck) + 0.15456 log₁₀(height). Female density = 1.29579 − 0.35004 log₁₀(waist + hip − neck) + 0.221 log₁₀(height). Body fat % = 495 ÷ density − 450; all dimensions in cm.
Worked example
Male measurements of height 170 cm, neck 35 cm and waist 85 cm give approximately 20.3%.
Assumptions and limits
Adult circumference estimate, not a clinical measurement. Measure consistently; invalid or out-of-model measurements produce no result. This is not a current military fitness assessment.