Skinfold Body Fat Calculator

Jackson-Pollock 3-site formula. Measure each site in mm. Informational only.

How the Math Works

The Skinfold Body Fat Calculator uses the 3-site Jackson-Pollock method, which involves measuring subcutaneous fat at three specific body sites: the chest, abdomen, and thigh for men, or the triceps, suprailiac, and thigh for women. These measurements, taken with calibrated calipers, are input into empirically-derived equations that account for the sum of the skinfold readings multiplied by specific coefficients, then divided by a constant and adjusted by body density calculations to estimate body fat percentage. While the precise mathematical formulas involve complex constants derived from population studies, the calculator internally processes these measurements to provide an accurate body fat percentage estimate.

Practical Applications

To use this calculator practically, start by locating the correct measurement sites: for men, measure the chest (midpoint between the last rib and iliac crest), abdomen (vertical distance 1 inch to the right of the navel), and thigh (midpoint between the hip and knee on the front of the thigh). For women, measure the triceps (back of the arm), suprailiac (above the hip bone), and thigh using the same thigh measurement as men. Use a high-quality skinfold caliper, ensure proper technique by relaxing the muscle and taking measurements quickly and consistently, then input all three measurements into the calculator to obtain your body fat percentage.

Day-to-Day Use

Knowing your body fat percentage through this calculator helps you track meaningful fitness progress beyond simple weight measurements, as it reveals changes in muscle mass versus fat loss. This information is valuable for athletic performance optimization, as different sports and activities require specific body composition ranges. Additionally, understanding your body fat percentage aids in setting realistic health goals, monitoring the effectiveness of nutrition and exercise programs, and making informed decisions about supplements or training modifications to achieve optimal physical condition.

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