Body fat estimate from BMI
Enter your values to see the result, check the formula and copy your calculation.
Enter your values, then calculate.
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The formula, explained
body fat % ≈ 1.2×BMI + 0.23×age − 10.8×coefficient − 5.4Deurenberg’s adult statistical estimate is not a body measurement or diagnosis. Coefficient: 1 male, 0 female. Individual error can be substantial, particularly in athletes. Do not use during pregnancy or for children.
Source and reference : Deurenberg et al., 1991 ↗
An example to check
Using the starting values below, the calculation gives:
How to use this tool
Check the required inputs: weight (kg), height (cm), adult age.
Choose the units and options that match your task. Calculate, check the result and use Copy or Print to keep a record. Rounding applies to the display; keep more precision in intermediate steps.
Can I use a decimal comma?
Yes. Numeric fields accept 12.5 or 12,5 and spaces for thousands, such as 1 234.50. Do not mix a point and comma in one number.
Where are my inputs processed?
Calculations run in your browser. Form values are not sent to Analytics. Copying, printing, sharing or opening an external service is your choice.
Method and interface checked on 2026-09-12 · Report an error