Health
Body Fat Calculator — US Navy Method, Free, No Upload
Estimate your body fat percentage using the US Navy circumference method — one of the most accurate tape-measure techniques available. Enter height, waist, neck, and (for women) hip measurements. Metric and imperial supported. Everything runs in your browser.
Frequently Asked Questions
- How accurate is the US Navy method?
- Studies show it estimates body fat within 3–4% of DEXA scan results for most people — more accurate than BMI and reliable without expensive equipment.
- Where do I measure waist and neck?
- Measure your waist at the narrowest point (near the navel), your neck just below the larynx, and for women, the widest part of the hips.
- Is my data sent anywhere?
- No. All calculations happen in your browser. Nothing is stored or transmitted.