Health
Body Fat Calculator
Estimate your body fat percentage from neck, waist and hip measurements using the US Navy method.
Your measurements
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The US Navy method
This calculator uses circumference measurements — neck, waist, and (for women) hip — to estimate body fat percentage without calipers or scanning equipment. It's the same method the US Navy uses for fitness assessments.
Frequently asked questions
How accurate is this method?
The Navy method is generally accurate within 3-4% of more precise methods like DEXA scans, making it a solid at-home estimate.
Where do I measure my waist?
Measure at the narrowest point, typically at the belly button level, for the most consistent results.