Calculator
Your bodyfat from a tape measure
Your height and two or three measurements. The US Navy's method, shown as a range, because a tape can miss by a few points.
Sex
Heightftin
How to measure
Measure on bare skin, with the tape snug but not pressing in. Men: the neck just below the voice box, and the waist at the belly button. Women: the neck, the waist at its narrowest, and the hips at their widest. Take each twice and use the average.
How it works
The formula is the US Navy's, from 1984. Against underwater weighing, its typical error was about 3.5 points, so a best guess of 22% means likely 18 to 26%. For tracking, use the same tape, the same spots and the same time of day, once a month.
2 sources
- Hodgdon JA, Beckett MB. Prediction of percent body fat for U.S. Navy men and women from body circumferences and height. Naval Health Research Center, reports 84-11 and 84-29, 1984.
- American Council on Exercise. Percent body fat norms for men and women.
More calculators
Weigh in each morning on a Withings or any Apple Health scale and Gyroscope logs your weight and bodyfat on its own, free on any plan. Open Gyroscope
