How this calculation works
Estimate adult body-fat percentage from circumference measurements using the U.S. Navy method. The result is calculated locally in your browser from the visible inputs, and the method below remains available for checking.
Worked example
Entered tape measurements produce a rough adult body-fat estimate, not a clinical measurement.
Assumptions and limits
- Inputs use the units shown beside each field.
- Intermediate values retain precision; displayed values are rounded for readability.
Questions people ask
How does the Body Fat Calculator work?
It applies this displayed method: The U.S. Navy circumference equations use log₁₀ of height and waist/neck, with hip included in the female equation. Values stay in your browser and are not submitted to a server.
What should I check before using the Body fat result?
Inputs use the units shown beside each field. Intermediate values retain precision; displayed values are rounded for readability. This is a general adult estimate, not a diagnosis or personalised medical advice. Seek a qualified clinician for health decisions.
Does this Body fat calculator save my information?
No. Calculation inputs are processed on this device. Sharing creates a URL only when you choose the share action.