Calculate your body fat percentage using the U.S. Navy formula. Enter your height, neck, waist, and hip measurements to estimate body fat percentage, fat mass, and lean mass. This free body fat calculator helps you track your fitness progress and understand your body composition.
Choose between Male or Female. Women store fat differently, so the calculator uses a different formula that requires an additional hip measurement.
Input your height, neck circumference, and waist circumference in centimeters. Use a flexible measuring tape for accurate readings.
If you selected Female, enter your hip circumference as well. This measurement is essential for the U.S. Navy formula for women.
Click Calculate to see your body fat percentage, fat mass, lean mass, and category. The color-coded gauge shows where you fall on the body fat spectrum.
Q: What is the U.S. Navy body fat formula?
A: It is a widely used estimation method developed by the U.S. Navy that uses body circumference measurements (neck, waist, height, and optionally hips) to calculate body fat percentage.
Q: How accurate is this body fat calculator?
A: The U.S. Navy formula provides a good estimate within 2-3% of hydrostatic weighing, making it one of the most accurate circumference-based methods available.
Q: Why do women need a hip measurement?
A: Women naturally store more fat in the hip and thigh area, so the formula includes hip circumference to account for this difference and provide a more accurate result.