Body Fat Calculator
Your body fat from a tape measure: height, neck and waist.
Body fat
—
Choose female or male, then type your height, neck and waist to see your body fat.
An estimate from a tape measure, usually within 3 to 4 points of a lab scan. It is not medical advice; a doctor or nurse can tell you what it means for you.
Saved readings
Save a reading to keep it on this device and see how it changes over time.
How this works
This is the US Navy tape method (Hodgdon and Beckett), in inches; metric is converted first (1 in is 2.54 cm). Men: 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76. Women: 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387. That is why it asks your sex, and why women measure their hip.
The ranges are the American Council on Exercise's. Women: athletes from 14%, fitness from 21%, average from 25%, obese from 32%. Men: athletes from 6%, fitness from 14%, average from 18%, obese from 25%. Below athletes is essential fat, the least the body needs (about 10% for women, 2% for men). With your weight it shows fat mass (weight times body fat) and lean mass (the rest: muscle, bone, organs, water).
Use a soft tape, snug but not pressing in, and measure twice. Tape methods are usually within 3 to 4 points of a lab scan, less close for very lean, muscular or large bodies, and not meant for children or pregnancy. This is not medical advice.
Your measurements are remembered on this device; readings are kept only when you save them (up to 20). Clear all empties the form, and Undo brings it back.
Saved on this device only. Nothing is sent anywhere.