Enter your measurements to calculate your body fat percentage using U.S. Navy standards.
The U.S. Navy Body Fat Calculator is a widely used method for estimating body fat percentage. It uses circumference measurements and height to calculate body fat, making it a convenient and non-invasive approach.
The formula differs for males and females:
Where all measurements are in inches.
Let's calculate the body fat percentage for a male who is 70 inches tall, weighs 180 lbs, has a neck circumference of 15 inches, and a waist circumference of 34 inches.
Step 1: Apply the U.S. Navy Formula for males
$$\begin{align} Body Fat \% &= 86.010 \times \log_{10}(34 - 15) - 70.041 \times \log_{10}(70) + 36.76 \\ &= 86.010 \times \log_{10}(19) - 70.041 \times \log_{10}(70) + 36.76 \\ &= 86.010 \times 1.2788 - 70.041 \times 1.8451 + 36.76 \\ &= 109.98 - 129.23 + 36.76 \\ &= 17.51\% \end{align}$$
Step 2: Calculate Fat Mass
$$\begin{align} Fat Mass &= (Body Fat \% \div 100) \times Weight \\ &= (17.51 \div 100) \times 180 \\ &= 31.52 \text{ lbs} \end{align}$$
Step 3: Calculate Lean Body Mass
$$\begin{align} Lean Body Mass &= Weight - Fat Mass \\ &= 180 - 31.52 \\ &= 148.48 \text{ lbs} \end{align}$$
Therefore, this person has an estimated body fat percentage of 17.51%, with 31.52 lbs of fat mass and 148.48 lbs of lean body mass.
This pie chart visually represents the body composition of the person in our example calculation. It shows the proportion of lean body mass (148.48 lbs) to fat mass (31.52 lbs) in their total body weight of 180 lbs.