Health
Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method — no calipers or scans needed.
How this is calculated
Uses the US Navy circumference method, which estimates body fat from neck and waist measurements (plus hip, for women) relative to height. Measure the waist at the navel and the neck just below the larynx for the most consistent results.
How accurate is it?
It is less accurate than a DEXA scan or hydrostatic weighing, typically within a few percentage points. Its real value is consistency: measured the same way each time, it tracks change reliably even if the absolute number is a little off.
Estimate only. Accuracy varies by individual body type.