Body Fat Calculator

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

Sex

Height

Waist

Neck

Hip (women only)

Body fat (%) 17.513

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

Step-by-step with your numbers:

1. Values used:

2. Height = 70

3. Waist = 34

4. Neck = 15

5. Hip (women only) = 38

7. Body fat = 17.513%

Did we solve your problem today?

Estimate body fat percentage from simple tape measurements using the U.S. Navy method.

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.