Health

Body Fat Calculator

Estimate body fat percentage using the U.S. Navy method.

Sex

Height

Waist

Neck

Hip (women only)

Calculated Output

Body fat (%) 17.513

Formula: U.S. Navy circumference method (log10 of body measurements)

Step-by-Step Breakdown

1. Values used:

2. Height = 70

3. Waist = 34

4. Neck = 15

5. Hip (women only) = 38

7. Body fat = 17.513%

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The math behind it

The method uses logarithms of circumference measurements (waist, neck, plus hip for women) and height. Measure in inches, relaxed and level.

Male, 70 in tall, 34 in waist, 15 in neck → about 17% body fat.

How accurate is it?

Within a few percent for most people; it's an estimate, not a clinical measurement.