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Body Fat Calculator

Free body fat percentage calculator using the US Navy method. Enter waist, neck, and height measurements for an accurate estimate.

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Body Fat Calculator
Free · Instant · No Signup

Formula

Formula
Male: %Fat = 86.01×log₁₀(waist−neck) − 70.041×log₁₀(height) + 36.76
US Navy method. Measure waist at navel, neck below larynx, and height. Women also measure hip at widest point. All in centimetres.

Frequently Asked Questions

What is a healthy body fat percentage?+
Men: Athletic 6-13%, Fitness 14-17%, Average 18-24%, Obese 25%+. Women: Athletic 14-20%, Fitness 21-24%, Average 25-31%, Obese 32%+.
How is body fat measured accurately?+
Most accurate methods: DEXA scan, hydrostatic weighing, Bod Pod. Good estimates: US Navy method, skinfold calipers. BMI is least accurate.
Can I lose body fat without losing weight?+
Yes — body recomposition allows simultaneous fat loss and muscle gain, maintaining or increasing weight while improving body composition.
Is this body fat calculator free?+
Yes, completely free with no signup required.

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