Free Body Fat Percentage Calculator
Estimate your body fat percentage using the US Navy method — no expensive equipment required. All you need is a tape measure and a few body circumference measurements.
Estimate Your Body Fat %
Measure and enter your circumferences to estimate body fat using the US Navy formula.
About the US Navy Method
Developed by the United States Navy, this method uses body circumferences and height to estimate body fat percentage using logarithmic equations.
For males: Uses neck and waist circumferences.
For females: Uses neck, waist and hip circumferences.
The method has been validated against more expensive measurement techniques (DEXA, hydrostatic weighing) and provides a reasonable estimate for most people. However, all body composition methods have a margin of error.
Body Fat Reference Ranges
Males
Females
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Frequently Asked Questions
Medical Disclaimer: Body fat estimates using circumference measurements have a margin of error. They should not be used as a medical assessment. Full disclaimer →