Question 1

How accurate is the Navy method compared with DEXA?

Accepted Answer

Typical error is about ±3–4 percentage points, similar to good skinfold measurements.

Question 2

Where should women measure the waist?

Accepted Answer

Navy instructions use the narrowest part of the natural waist for women and the navel level for men.

Question 3

Why does the formula use logarithms?

Accepted Answer

Body density changes less and less as circumference keeps growing; a logarithm captures that curve.

Your numbers