What are skinfold measurements?

Skinfold measurement is a technique to estimate how much fat is on the body. It involves using a device called a caliper to lightly pinch the skin and underlying fat in several places. This quick and simple method of estimating body fat requires a high level of skill to get accurate results. Skinfold measurement is best used when comparing results from one measurement to the next, rather than relying on the results of a single measurement. To compare results from one measurement to another, it is best to have the same person do the measurements each time.

Skinfold measurements measure the thickness of skin and relate how much body fat a person is holding in their body based on how thick their skin fold measurements are.  There are several sites to measure skinfold fitness and several formulas to use based on those measurements which will give you an accurate estimation of body fat levels.