Use height and body circumferences to estimate body-fat percentage with the equation selected by sex.
Calculate with the Body Fat Calculator
Enter the details below. Your values stay in this browser and are validated before results are shown.
Body Fat Calculator results
How to use the Body Fat Calculator
- Select the requested method and unit system where available.
- Enter measured values carefully using the labels and active units.
- Select Calculate or press Enter.
- Read the estimate together with its method, assumptions, limitations, and safety notice.
Worked example
Small changes in waist, neck, or hip measurement can noticeably change the estimate, so use consistent measurement locations.
Interpreting the estimate
Reference bands are deliberately broad and neutral because ranges differ by age, sex, athletic status, and source.
Limitations
- Circumference error can materially affect the estimate.
- This method does not diagnose obesity, fitness, or health risk.
Frequently asked questions
Why does measurement technique matter?
The formula uses differences between circumferences inside logarithms, so even modest tape-placement or tension differences can affect the result.
Is the body-fat calculator a medical assessment?
No. It provides an educational estimate from the values entered and cannot account for every individual or clinical factor.
Does CalculatorCheck store my health information?
No. The calculation runs in your browser, and the entered values are not sent to a server or added to the page URL.