📊 Body Fat Calculator

Enter your body measurements below to calculate body fat percentage (BF%), fat mass, and lean body mass (LBM). Uses the U.S. Navy Method, accurate to within +/-2-3% of hydrostatic weighing.

Gender

Age

Height (cm)

Weight (kg)

Neck Circumference (cm)

Waist Circumference (cm)

Hip Circumference (Female) (cm)

Results

Body Fat %

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Classification

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Fat Mass

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Lean Body Mass

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How to Use the Body Fat Calculator

Using the Body Fat Calculator is straightforward:

Enter Your Values
Input the required numbers and parameters into the calculator fields. Each field is clearly labeled — simply type your values or use the spinner controls to adjust them.
Configure Options
Select any additional options such as computation mode, currency, time period, or precision level. The calculator updates automatically as you change values.
View the Results
The calculated result is displayed instantly with clear formatting. You can Copy the result to your clipboard or adjust input values to see how different scenarios affect the outcome.

FAQ

What is body fat percentage?

Body fat percentage (BF%) is the proportion of fat in your total body weight. It provides a more accurate assessment of body composition and health than BMI or weight alone.

How accurate is the U.S. Navy Method?

The U.S. Navy Method is one of the most widely used body fat estimation techniques, with accuracy close to hydrostatic weighing (+/-2-3% error margin). It uses simple circumference measurements to estimate body density.

Why do women need hip measurement?

Women store fat differently than men, so the formula requires an additional hip measurement for accuracy. The male formula uses height, neck, and waist only.

What is a healthy body fat percentage?

Healthy ranges: Men 6-24% (athletes 6-13%, average 14-24%), Women 14-31% (athletes 14-20%, average 21-31%). Both too high and too low body fat can be unhealthy.

What is lean body mass (LBM)?

Lean Body Mass (LBM) is your total body weight minus fat mass. It includes muscle, bones, organs, and water. Higher LBM boosts metabolism and helps maintain healthy body composition.