How do I use the Body Fat Calculator?

Select your gender. Enter your height and weight. Measure your waist circumference at navel level. Measure your neck circumference. For females, also measure hip circumference. Click Calculate to see your estimated body fat percentage.

Is the Body Fat Calculator free?

Yes, the Body Fat Calculator is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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Body Fat Calculator

Estimate body fat percentage using the U.S. Navy method with waist, neck, and hip measurements.

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Body fat calculator

Estimate your body fat percentage

Uses the U.S. Navy method with waist, neck, and hip measurements.

Gender Height

Weight

Waist circumference

At navel level Neck circumference

Hip circumference

Required for females

Results

Body fat

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Category	Men	Women
Essential fat	2-5%	10-13%
Athletes	6-13%	14-20%
Fitness	14-17%	21-24%
Average	18-24%	25-31%
Obese	25%+	32%+

How to Use the Body Fat Calculator

1 Select your gender.
2 Enter your height and weight.
3 Measure your waist circumference at navel level.
4 Measure your neck circumference.
5 For females, also measure hip circumference.
6 Click Calculate to see your estimated body fat percentage.

The U.S. Navy body fat method uses circumference measurements to estimate body fat percentage. For males, it uses waist and neck measurements relative to height. For females, it adds hip measurement. While not as accurate as DEXA scans or hydrostatic weighing, the Navy method is free, quick, and reasonably accurate within 3-4% for most people.

Body fat categories vary by gender. For men, 6-13% is athletic, 14-17% is fitness, 18-24% is average, and 25%+ is obese. For women (who naturally carry more essential fat), 14-20% is athletic, 21-24% is fitness, 25-31% is average, and 32%+ is obese. Fat mass and lean mass are calculated from your body fat percentage and total weight.

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