Health & Fitness
Body Fat Estimate (Navy Method) Calculator
Estimate body fat percentage from tape measurements using the US Navy circumference method.
Formula
For men the Navy formula uses waist, neck and height; for women it adds hip measurement, all combined with base-10 logarithms.
How it works
Tape measurements are fed into the Navy equation, which estimates body density and converts it to a fat percentage. Measure waist at the navel, neck below the Adam's apple, and hip at the widest point, keeping the tape snug but not tight.
FAQs
How accurate is it?
Within a few percentage points for many adults, but tape placement alone can shift it.
Why does it ask for neck size?
Neck size helps adjust for frame size in the Navy equation.
Can it replace a scan?
No. Scans and calipers measure differently; this is a free rough estimate.
General information only, not medical advice.