Estimate body fat percentage with the US Navy tape method.
Estimate your body fat percentage using the US Navy circumference method — just a tape measure needed. Enter your height, neck and waist (plus hip for women). It's an estimate, useful for tracking trends over time.
It's a reasonable estimate (±3–4%) and great for tracking change, though not as precise as a DEXA scan.
Measure the neck below the larynx, the waist at the navel, and (women) the hip at the widest point, keeping the tape level.