Body Fat Calculator

Body Fat Estimate

BMI is unitless. Age is entered in years.

Formula: body fat % = 1.2 x BMI + 0.23 x age - 10.8 x sex - 5.4.

Understanding Body Fat Estimate

1. What This Calculator Measures

This calculator gives a rough body fat percentage estimate from BMI, age, and gender.

2. How the Calculation Works

It uses a population-based formula, so it is helpful for screening but not a medical diagnosis.

3. Formula or Rule Used

body fat % = 1.2 x BMI + 0.23 x age - 10.8 x sex - 5.4.

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