Body Fat Calculator
Estimates body fat percentage using the U.S. Navy circumference method — one of the most accurate body fat formulas that doesn't require calipers or DEXA scanning. Requires only a tape measure.
Body Fat Percentage Categories
Men
| Essential fat | 2–5% |
| Athletic | 6–13% |
| Fit | 14–17% |
| Average | 18–24% |
| Obese | ≥ 25% |
Women
| Essential fat | 10–13% |
| Athletic | 14–20% |
| Fit | 21–24% |
| Average | 25–31% |
| Obese | ≥ 32% |
U.S. Navy Method:
Men: 495 / (1.0324 − 0.19077×log₁₀(waist−neck) + 0.15456×log₁₀(height)) − 450
Women: 495 / (1.29579 − 0.35004×log₁₀(waist+hip−neck) + 0.221×log₁₀(height)) − 450
How to use
Measurements
Use a flexible tape measure. Measure neck circumference just below the larynx (Adam's apple). Measure waist at the narrowest point (usually navel level). Women also measure hips at the widest point.
Categories
Essential fat is the minimum required for bodily functions. Athletic (6–13% men / 14–20% women) is typical for trained athletes. Fit is healthy and active. Average is acceptable but carries some health risk. Above 25% (men) or 32% (women) is considered obese by most standards.
Formula
Men: 495 / (1.0324 − 0.19077×log₁₀(waist−neck) + 0.15456×log₁₀(height)) − 450
Women: 495 / (1.29579 − 0.35004×log₁₀(waist+hip−neck) + 0.221×log₁₀(height)) − 450
Tips
- •Take measurements in the morning before eating for consistency.
- •Measure in centimetres for best accuracy — the formula was developed in metric units.
- •Compare with your BMI — athletes often have a high BMI but low body fat.