Estimate body fat percentage
Estimate adult body-fat percentage using the Deurenberg BMI-based regression.
Input & settings
How to use this tool
Formula: 1.20×BMI + 0.23×age − 10.8×sex − 5.4, where the published sex coefficient is 1 for male and 0 for female.
Limits and behavior
Supports age 20–83 and BMI 13.9–40.9 within the published sample ranges. The reported standard error was 4.1 percentage points; it is not an individual confidence interval. No body-fat category or treatment advice is inferred. Source DOI: 10.1079/BJN19910073. Educational estimate only. Not a diagnosis or a prescribed calorie intake. Not suitable for children, pregnancy, lactation, acute illness or individualized clinical decisions. These population equations may perform differently across ethnicities, muscularity and health conditions. Inputs remain in your browser. Input is limited to 1 MB and output to 3 MB. No input content is saved by CraftAI.
Estimate body fat from a population regression
Use supported adult input measurements for a regression-based body-fat estimate.
Can this replace an actual body composition measurement?
No. The estimate can be inaccurate for individuals and is not a clinical measurement or diagnosis.
Related tools: calculate bmi · calculate basal metabolic rate