Body Fat Calculator
Estimate body-fat percentage from circumference measurements.
Uses the U.S. Navy circumference estimate; measurement technique affects the result.
How to use this calculator
- Choose the equation sex and enter height, waist, neck, and hip where required, using centimetres consistently.
- Review the live result and use Copy result when you need to share it.
How the calculation works
The U.S. Navy circumference equations use logarithmic relationships between height and measured circumferences.
Formula
The U.S. Navy circumference equations use logarithmic relationships between height and measured circumferences.
Step-by-step calculation
- Choose the equation sex and enter height, waist, neck, and hip where required, using centimetres consistently.
- The U.S. Navy circumference equations use logarithmic relationships between height and measured circumferences.
- Check the displayed result, then copy it if needed.
Worked example
A 165 cm woman with 78 cm waist, 34 cm neck, and 98 cm hips receives a circumference-based estimate.
Risk guidance
Frequently asked questions
Does this tool send my inputs anywhere?
No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.
How should I use the result?
Check that the entered units and values match your situation, especially around dates, breaks, and rounding.
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