Body Fat Calculator
This estimates body fat from a few body measurements taken with a tape. It is a rough estimate, not a medical test, and it gives no category or verdict.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The US Navy tape method uses the logarithm of your measurements. For men it uses waist minus neck and height. For women it uses waist plus hip minus neck, and height. Everything is converted to centimetres first.
Take the waist at the narrowest point, the neck just below the voice box, and for women the hip at its widest, with the tape level and snug but not tight.
Worked example
With a height of 70 in, a neck of 15 in and a waist of 34 in, the estimate is about 24 percent body fat.
Questions
How accurate is the tape method?
It is a rough estimate. Results change with how the tape sits and how you breathe, so measure the same way each time.
Why does it ask for hip only for women?
The published women's version of this formula uses the hip measurement. The men's version does not, so the hip box is ignored for men.
Is this a diagnosis?
No. It is a rough number with no label attached. Talk with a doctor if you want to know more about your body composition.
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