Skinfold measurements are used to predict the body composition, or body fat percentage, using a regression equation. Skinfold measurements are taken using calipers, a tool designed for this purpose, at standardized sites on the body. Measurement sites vary between men and women based on the difference in body fat storing. Consistency in measurement is imperative in order to obtain the most accurate results.
Step 1
Identify the appropriate anatomical location. For women, anatomical locations for skinfold measurement are the triceps, thigh and suprailium, or hip. Anatomical locations must be accurate for appropriate caliper readings.
Step 2
Grasp the skin between the thumb and index finger. At the triceps, skin should be held at the back of the arm, vertically halfway between the shoulder and elbow. At the thigh, skin should be held at the front of the leg, vertically halfway between the hip and knee. At the suprailium, skin should be held diagonally at or just above the hip bone.
Step 3
Place calipers perpendicular to the skinfold. Position the pads 1/4 inch from the thumb and index finger. Wait approximately four seconds before reading the calipers to allow for fat to compress. Read the caliper to the nearest half millimeter.
Step 4
Repeat measurements at least two times per site. Wait at least 15 seconds between readings. Take measurements until the two numbers are less than 1 mm apart.
Step 5
Use the numbers to calculate body fat. Take 1.0994921 - 0.0009929 x the sum of measurements. Add 0.0000023 x the sum of measurements squared. Subtract 0.0001392 x age. Divide body density by 495 and subtract 450 times 100.
Things You'll Need
- Calipers
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