Body Fat Calculator

Estimate your body fat percentage with the US Navy tape-measure method — just a neck, waist (and hip) measurement plus your height.

Sex

Height (cm)

Neck circumference (cm)

Waist circumference (cm) — men at navel, women at narrowest

Hip circumference (cm) — women only

Estimated body fat

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Fat mass

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Lean (fat-free) mass — needs weight below

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Body weight (kg) — for fat/lean mass

How it works: The US Navy method works in inches. Men: % = 86.010·log₁₀(waist − neck) − 70.041·log₁₀(height) + 36.76. Women: % = 163.205·log₁₀(waist + hip − neck) − 97.684·log₁₀(height) − 78.387. Measure the waist horizontally at the navel (men) or narrowest point (women), neck just below the larynx, hips at the widest point. Tape methods are estimates — typically within a few percent of lab methods.

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Estimates only — this tool is for general information and planning, not medical advice. If you have a health concern, please talk to a qualified clinician.