Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method.
Uses the US Navy circumference method. Measure the neck below the larynx, the waist at the navel, and (for women) the hips at the widest point.
This tool is for general information only and is not medical advice. Talk to a qualified healthcare professional before making health decisions.
About the Body Fat Calculator
This calculator estimates your body fat percentage using the US Navy circumference method, which needs only a tape measure and no special equipment.
Enter your height and a few body measurements and it returns an estimated body fat percentage along with a fitness category. It is a practical way to track changes over time.
Measurements are calculated in your browser and never uploaded. Circumference methods are estimates and can differ from lab measurements.
Key features
- US Navy tape-measure method
- Body fat percentage and category
- Separate formulas for men and women
- Private, in-browser calculation
How to use
- 1Select your sex and enter your height.
- 2Measure and enter your neck, waist and (for women) hips.
- 3Read your estimated body fat percentage.
Frequently asked questions
- How do I measure correctly?
- Measure the neck just below the larynx, the waist at the navel, and (for women) the hips at the widest point. Keep the tape level and snug but not tight.
- How accurate is it?
- The US Navy method is a reasonable estimate for most people, usually within a few percent of more expensive methods, and is very consistent for tracking progress.