Body Fat Percentage Calculator

The US Navy body fat formula is a method developed by the U.S. Navy to estimate body fat percentage using simple body measurements. For men, it uses height, waist, and neck measurements. For women, it also includes hip measurements. It's considered reasonably accurate (within 3-4% of more precise methods) and is used by the military for fitness assessments.

Measure your waist at the narrowest point, typically at the navel level or slightly above. Stand relaxed, don't suck in your stomach, and measure after exhaling normally. The tape should be snug but not compressing the skin. Take the measurement first thing in the morning for consistency.

Measure your neck circumference just below the larynx (Adam's apple), with the tape sloping slightly downward at the front. Keep your head level and look straight ahead. The tape should touch the skin all around without compressing it.

For women, measure hips at the widest point of the buttocks. Stand with feet together, and wrap the tape around the fullest part of your hips/buttocks. Keep the tape parallel to the floor and don't pull it too tight.

The US Navy method is typically accurate within 3-4% of body fat for most people. However, it may be less accurate for very lean athletes, elderly individuals, or those with unusual body proportions. For the most accurate results, consider DEXA scans, hydrostatic weighing, or professional calipers.

Healthy body fat ranges differ by gender. For men: 10-20% is generally healthy, with athletes at 6-13%. For women: 18-28% is healthy, with athletes at 14-20%. Essential fat (minimum for health) is 2-5% for men and 10-13% for women. Below essential levels can cause health problems.