Body fat calculator.
Estimate your body fat percentage using the U.S. Navy circumference method — no calipers, no guesswork.
Body fat percentage.
Results update as you type. All inputs are in your chosen unit system.
Enter your measurements
About the body fat calculator
This calculator uses the U.S. Navy circumference method, a validated formula developed by Hodgdon and Beckett (1984) and widely used by military and fitness professionals. It estimates body fat from body measurements without requiring expensive equipment.
For men, the formula uses height, waist, and neck circumference. For women, hip circumference is added for greater accuracy, since women typically carry more fat in the hip and thigh region.
Body fat percentage categories
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Acceptable | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
⚠ Disclaimer: This calculator provides an estimate only. Body fat percentage results vary based on measurement accuracy. The Navy method is not a substitute for clinical body composition testing. Consult a healthcare professional before making significant dietary or training changes.
FAQ
How is body fat percentage calculated?
PRECISR uses the U.S. Navy circumference method, which estimates body fat from waist, neck, and hip measurements — proven accurate within 3–4% of DEXA scan results.
What is a healthy body fat percentage?
For men, 10–20% is generally considered healthy. For women, 18–28% is a typical healthy range. Ideal ranges vary by age, genetics, and fitness goals.
Is this calculator accurate?
The Navy method is well-validated for general use. For clinical precision, methods like DEXA scanning or hydrostatic weighing are more accurate. Always consult a healthcare professional for medical decisions.
Where do I measure waist circumference?
Measure at the level of your navel (belly button), not at the narrowest point. Keep the tape horizontal and snug but not compressing the skin.