Body Fat Calculator
Estimate body fat percentage using the US Navy tape-measure method.
Estimate your body fat percentage using the US Navy tape-measure method — no calipers required. Enter your height and a few circumference measurements (neck and waist, plus hips for women) and the tool returns an estimated body fat percentage and category. Body fat is a better progress metric than weight alone because the scale can't tell muscle from fat.
Measure on bare skin with a snug (not tight) tape, first thing in the morning, and track the trend over weeks. It is an estimate, not a medical measurement.
Frequently asked questions
How does the US Navy body fat method work?
It estimates body fat from your height and neck, waist (and hip for women) measurements using a validated formula.
How should I measure for accuracy?
Use a snug tape on bare skin, measure the waist at the navel and hips at the widest point, and measure at the same time each day.
Is it as accurate as a DEXA scan?
No, but it is free and repeatable. The trend over time matters more than the exact percentage.
What is a healthy body fat percentage?
Rough ranges differ by sex; for men ~14–24% and for women ~21–31% are commonly considered average. Athletes are lower.