Body Fat Percentage Calculator
Estimate your body fat percentage using the US Navy circumference method, which needs only a tape measure rather than special equipment. Enter your height and neck and waist measurements (plus hips for women), and the calculator applies the Navy formula to estimate the share of your body weight that is fat. It also shows your estimated fat mass and lean mass if you enter your weight, and places you in a general category. This method is a convenient screening estimate and can be off by several points compared with a lab scan, so use it to track change over time rather than as an exact number. Take measurements consistently for the best trend. Everything is computed locally in your browser.
How to use Body Fat Percentage Calculator
- Select your sex and enter your height.
- Measure and enter your neck and waist.
- Enter your hips if you are female.
- Read your estimated body fat percentage.
Frequently asked questions
Which method does this calculator use?
It uses the US Navy circumference method, which estimates body fat from tape measurements rather than skinfold calipers.
What measurements do I need?
You need your neck and waist for men, plus hips for women, along with your height. All are simple tape measurements.
How accurate is the US Navy method?
It is a reasonable estimate for most people but less precise than methods like DEXA. Measure consistently for the best repeatability.
What is Body Fat Percentage Calculator?
Estimate your body fat percentage using the US Navy circumference method, which needs only a tape measure rather than special equipment. Enter your height and neck and waist measurements (plus hips for women), and the calculator applies the Navy formula to estimate the share of your body weight that is fat.
Is Body Fat Percentage Calculator free to use?
Yes. Body Fat Percentage Calculator is completely free, with no sign-up and no usage limits.
Does Body Fat Percentage Calculator work in a web browser?
Yes. Body Fat Percentage Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Body Fat Percentage Calculator?
Yes. Body Fat Percentage Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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