Body Fat Calculator
This estimate uses tape measurements of height, neck and waist, plus hips for women, with the navy tape formula. It gives a rough body fat percentage. Tape methods are less exact than a scan or a water test.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The formula works with logarithms of your measurements, taken in inches. For men it uses waist minus neck and height. For women it uses waist plus hips minus neck and height.
Measure the neck just below the voice box, the waist at the navel for men and at its narrowest point for women, and the hips at their widest point. Keep the tape level and snug, not tight.
Worked example
With 68 in height, 15 in neck and 34 in waist, the estimate is 18.4% body fat.
Questions
How accurate is a tape measure?
It is a rough estimate. A small change in where the tape sits can move the result by a percent or more, so measure the same way each time.
Why does the female formula need hips?
This method was built with hip size for women, because many women carry more fat around the hips than men do.
What do I do with the number?
Track it over time with the same measurements, and talk with a doctor or fitness professional about what it means for you.
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