Body Fat Percentage Calculator
Approximates body fat percentage using the U.S. Navy circumference method or the BMI method.
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With just your neck and waist (and hips for women) circumference measured by tape, it estimates your body fat percentage using the U.S. Navy formula; if measuring is hard, you can calculate quickly from height, weight, and age. It's handy for checking your rough body fat level and rating when you don't have a body-composition analyzer.
How to use
- Select the 'U.S. Navy method' or 'BMI method' tab and your sex.
- For the U.S. Navy method, enter your height, neck, and waist (plus hips for women) in cm.
- For the BMI method, enter your height, weight, and age.
- Check your estimated body fat percentage and rating (essential fat, athlete, good, average, obese).
FAQ
- How do I take measurements for the U.S. Navy method?
- Measure the narrowest part of the neck just below the larynx; the waist at the navel for men and at the narrowest part for women; and the hips at the most protruding point, horizontally with a tape and entered in cm. The waist must be larger than the neck for the calculation to work.
- Which of the two methods is more accurate?
- The U.S. Navy method, with direct circumference measurements, is usually more accurate. The BMI method (Deurenberg formula) doesn't account for muscle mass, so it has a large margin of error for muscular or skinny-fat body types.
- Can I use this instead of a body-composition scan?
- It's a formula-based approximation, so treat it as a reference. It can differ from your actual body fat by 3-5 percentage points or more, so measure with body-composition equipment for an accurate value.