Body Fat Calculator
Estimate adult body-fat percentage with the Deurenberg BMI-age-sex model and show its uncertainty and limitations.
Enter or adjust the values above, then calculate.
Body Fat: estimate Body Fat Percentage
Estimate adult body-fat percentage with the Deurenberg BMI-age-sex model and show its uncertainty and limitations.
Inputs this tool uses
- Age
- Sex used by the formula
- Height
- Weight
What you get
Deurenberg BMI-age-sex body-fat estimate.
How to use the Body Fat Calculator
- Enter age, sex used by the formula, height and the other fields relevant to this calculation.
- Select any method, activity level or option shown on this page, then choose Calculate.
- Read the main result together with the supporting values, method, assumptions and limitations below before using the estimate.
How this calculation works
The Deurenberg model estimates adult body-fat percentage from BMI, age and sex. It is a population equation, not a direct body-fat scan.
Example calculation
The sample values loaded into the calculator produce 30.6%. This example exists to show how the output is structured; replace the sample values with your own inputs for your calculation.
Assumptions and limitations
- Anthropometric formulas are estimates and can differ from direct clinical measurements.
- Results are educational screening/reference values and do not diagnose health conditions.
Sources and review status
Source set last verified 2026-09-25. No clinician review is claimed unless a real named reviewer is displayed.
Questions people ask about Body Fat Calculator
Is this body-fat estimate as accurate as DEXA?
No. This page uses a population equation based on BMI, age and sex. It is not equivalent to DEXA, air-displacement plethysmography or another direct body-composition assessment.
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