Body Fat Percentage Formula

Body Fat Percentage Formula

A Body Fat Percentage Formula can be used to estimate your body's total fat based on specific measurements. If you are more comfortable with the International System of Units (SI), use the "Metric Units" tab. To get the best results, measure to the nearest 1/4 inch (0.5 cm). This calculation is based on the US Navy method, but also includes the calculation of body fat percentage using the BMI method.

Measuring Body Fat Percentage - U.S. Navy Method

Body fat percentage (BFP) formula for males:

USC Units:

BFP = 86.010×log10(abdomen-neck) - 70.041×log10(height) + 36.76

Body fat percentage (BFP) formula for females:

USC Units:

BFP = 163.205×log10(waist+hip-neck) - 97.684×(log10(height)) - 78.387


BMI Method:

Body fat percentage (BFP) formula for adult males:

BFP = 1.20 × BMI + 0.23 × Age - 16.2

Body fat percentage (BFP) formula for adult females:

BFP = 1.20 × BMI + 0.23 × Age - 5.4

Body fat percentage (BFP) formula for boys:

BFP = 1.51 × BMI - 0.70 × Age - 2.2

Body fat percentage (BFP) formula for girls:

BFP = 1.51 × BMI - 0.70 × Age + 1.4

Note: formula is also called body fat percentage algorithm

Body Fat Percentage Categories

Classification Women (% Fat) Men (% Fat)
Essential Fat 10-12% 2-4%
Athletes 14-20% 6-13%
Fitness 21-24% 14-17%
Acceptable 25-31% 18-25%
Obese 32% + 25% +