Looking for a body fat percentage calculator navy method? This free tool gives you body fat percent from neck, waist and hip measurements. Just enter your numbers and press Calculate — results are instant.
The US Navy method estimates body fat from tape measurements instead of a scan: for men it uses neck and waist circumference with height; for women it adds the hip measurement. The measurements go into logarithmic formulas that were fitted against laboratory body-composition tests. It is an estimate — usually within about 3 to 4 percentage points — but it is free, quick, and good for tracking change over time if you measure the same way each time.
Example: Male · Height 175 cm · Neck 38 cm · Waist 80 cm
Body Fat Percentage: 19.27%
Usually within about 3 to 4 percentage points of a laboratory measurement. It is good enough for tracking change over time, but not exact enough for a medical decision.
Use a soft tape, measure on bare skin, keep the tape level and snug but not tight, and measure the same way each time — ideally in the morning. Waist is measured at the navel for men, at the narrowest point for women.
For men, the calculator classes under 6% as essential, under 14% athletes, under 18% fitness, under 25% average, and 25% or above as obese. For women the bands are under 14%, 21%, 25% and 32%. Athletes sit lower than the general population by design.
Less well. The Navy formulas were fitted on typical bodies, and unusual builds — very muscular, or carrying weight in unusual places — can push the estimate off. A scan is the accurate alternative.