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Free Online Tool
Body Fat Calculator
Estimate body fat percentage.
Instant resultsNo signup100% free
Works entirely in your browser
What is Body Fat?
Body fat percentage tells you how much of your weight is fat versus lean mass. This calculator uses the U.S. Navy circumference method — waist, neck and height — to give you a dependable estimate.
- U.S. Navy circumference method
- Gender-specific category ranges
- Fat mass & lean mass breakdown
How to Use
- 1Select your gender.
- 2Enter your weight, waist, neck and height.
- 3Press Calculate to see your estimated body fat percentage and category.
Stay healthy, stay happy!
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Frequently Asked Questions
How accurate is this method?
The U.S. Navy method is a well-regarded estimate. For a precise reading, professional body composition testing is recommended.
What is a healthy body fat percentage?
Athletes are typically 6–13% (men) or 14–20% (women); fitness ranges are 14–17% and 21–24% respectively.
Is this medical advice?
No. Use it as a general guide and consult a professional for a full health assessment.