Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy circumference method — one of the most accessible and reasonably accurate methods short of DEXA or hydrostatic weighing. It uses waist, neck, and hip measurements alongside your height and weight.
Frequently Asked Questions
What is the U.S. Navy method?+
The U.S. Navy method estimates body fat using body circumferences (waist, neck, hip) and height. It was developed for military fitness assessments. While less accurate than DEXA or hydrostatic weighing, it is consistent, free, and doesn't require specialised equipment.
What is a healthy body fat percentage?+
For men: essential fat 2–5%, athletic 6–13%, fitness 14–17%, average 18–24%, obese 25%+. For women: essential fat 10–13%, athletic 14–20%, fitness 21–24%, average 25–31%, obese 32%+. Women naturally carry more essential fat due to hormonal and reproductive physiology.
How do I measure waist accurately for this calculation?+
For males: measure at the level of the navel, without sucking in. For females: measure at the narrowest point of the torso (usually just above the navel). Keep the tape horizontal and snug but not compressing the skin.
Is this more accurate than BMI?+
Generally yes. BMI doesn't distinguish between muscle and fat — a muscular athlete can have a high BMI without excess fat. Body fat % directly estimates fat tissue. However, the Navy method can underestimate fat in very lean individuals and overestimate in those with large necks.