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Body fat/Skinfold Calculator

Durnin and Womersley Method

Among affordable methods for measuring body fat percentage, using a skinfold caliper is still the best and the four spot formula by Durnin and Womersley is very accurate for most people.

Take measures as indicated to the left, dial them up on the calculator below with the other info for a bodyfat percentage and lean weight.



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  1. Measure skinfold in millimeters as indicated on the pictures and enter values.
  2. For further instructions see our guide How to measure body fat with a skinfold caliper


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This guide tells how to use a skinfold caliper and how to choose the right test.

First of all you need a skinfold caliper. Many different qualities are available on the market today. Our recommandation is, that if you need research grade quality, you should go for the Harpenden skinfold caliper or the Lange skinfold caliper ($300-$400). If you just need a good caliper at an affordable price, we recommend the Slim Guide caliper ($20-$30).

Currently we are providing the Durnin and Womersley formula , which is suitable for most purposes and the Slaugther formula for children. Later more protocols will follow.

Conducting the measurements
It is important that you practice and get experienced with the measurements in order to achieve a high reliability in your measurements.

  1. When using the caliper you gently pinch a skinfold with your thumb and index finger.
  2. 1-2 cm aside from your fingers you place the measuring tips of the caliper.
  3. Release the caliper and wait 1-2 seconds before you make the reading on the calipers scale.
  4. Repeat an additional 2 times at the same spot. Use the average of the 3 readings