Body Fat Calculator
Estimate body fat percentage using the scientifically validated US Navy circumference method. Shows your fitness category.
Estimated Body Fat
0%
Uses the US Navy circumference method. Measure at navel level for waist.
📐 Formula
Male: BF% = 86.010×log₁₀(waist−neck) − 70.041×log₁₀(height) + 36.76. Female: BF% = 163.205×log₁₀(waist+hip−neck) − 97.684×log₁₀(height) − 78.387
Frequently Asked Questions
For men: Athletic (6–13%), Fit (14–17%), Average (18–24%), Above average (25%+). For women: Athletic (14–20%), Fit (21–24%), Average (25–31%), Above average (32%+). Essential fat is 2–5% for men and 10–13% for women.
The US Navy method is accurate to within 3–4% for most people. It's a reliable field test but less precise than DEXA scanning or hydrostatic weighing. Consistent measurement technique is key.
Measure at the navel (belly button) level, not the narrowest point. Keep the measuring tape horizontal, don't suck in your stomach, and measure after exhaling normally.