Body Fat Percentage Calculator

The US Navy method estimates body fat within about 3-4% of results from more expensive methods like DEXA scans or hydrostatic weighing. It was developed for military fitness assessments and has been validated across large populations. Accuracy depends on taking consistent, precise circumference measurements. The method works best for people with typical body proportions and may be less accurate for highly muscular individuals or those with unusual fat distribution patterns.

The BMI method uses only height, weight, and age, so it cannot distinguish between fat mass and muscle mass. A muscular person may show a high BMI-based body fat estimate despite actually having low body fat. The US Navy method uses circumference measurements that better capture where fat is distributed on the body. The BMI method is included as a quick reference, but the US Navy method is generally more reliable for individual assessment. Comparing both results gives you a reasonable range.

Healthy ranges differ by sex. For men, essential fat is 2-5%, athletes typically range 6-13%, fitness level is 14-17%, average is 18-24%, and above 25% is considered obese. For women, essential fat is 10-13%, athletes range 14-20%, fitness level is 21-24%, average is 25-31%, and above 32% is obese. Women naturally carry more essential fat for reproductive and hormonal functions. The ideal percentage depends on your goals, age, and overall health. Consult a healthcare professional for personalized guidance.

For the US Navy method, measure your waist at the narrowest point of your natural waistline, typically at or just above the navel. Stand relaxed and do not suck in your stomach. Measure your neck just below the larynx (Adam's apple) with the tape sloping slightly downward at the front. Women should measure hips at the widest point of the buttocks. Use a flexible measuring tape pulled snug but not compressing the skin. Take measurements in the morning before eating for the most consistent results.