Body Fat Calculator
Estimate your body fat percentage using the US Navy measurement method. Enter your measurements for instant results.
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How to measure: Use a flexible tape. Neck — just below the larynx. Waist — narrowest point (women) or navel (men). Hips (women) — widest point.
About This Tool
What it does
Estimates body fat percentage using the US Navy circumference method — a widely used formula requiring only a tape measure. Shows your result alongside healthy range guidance from the American Council on Exercise (ACE).
Who it's for
Anyone wanting a quick body composition estimate without specialist equipment. Popular with gym-goers, athletes and anyone tracking fitness progress. More meaningful than BMI alone as it distinguishes fat from muscle.
Your privacy
All calculations happen in your browser. No data is transmitted or stored anywhere.
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Frequently Asked Questions
How is body fat percentage calculated?
This calculator uses the US Navy circumference method using neck, waist and hip measurements. It is one of the most accessible methods that does not require specialist equipment such as calipers or DEXA scanning.
What is a healthy body fat percentage?
According to the American Council on Exercise (ACE): women — athletic 14-20%, fit 21-24%, acceptable 25-31%. Men — athletic 6-13%, fit 14-17%, acceptable 18-24%. Essential fat (minimum needed for health) is 10-13% for women and 2-5% for men.
How accurate is the Navy method?
Accuracy is approximately ±3-4% when measurements are taken correctly. Less accurate than DEXA scanning but far more accessible. For most consistent results measure first thing in the morning.
How do I measure correctly?
Use a flexible tape. Neck: just below the larynx. Waist: narrowest point (women) or navel level (men). Hips (women only): widest point. Stand relaxed and exhale before measuring.
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