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The following calculator gives you an estimate of your % bodyfat and lean body mass based on your weight, age and thickness measurements of 3 skin folds. It is based on the Jackson-Pollock 3-point method and is reasonably accurate for most people. This method, however, as almost all popular skin fold methods, tends to underestimate body fat levels in very lean bodybuilders.DOWNLOAD CALCULATOR
To perform each measurement: Using the tips of your thumb and forefinger pinch the skin in the area to be measured. Pull the skin away from the muscle, being sure to ‘get’ all the subcutaneous fat underneath the skin but don’t include the underlying muscle. Measure the thickness of this fold of fat and skin, in millimeters, with either a ruler (metric) or skin fold calipers. If you do have calipers, the jaws should be placed close to where the fingertips have the skin pinched so an accurate reading can be obtained (about 1 cm (1/4 in) away from the fingers). Release the caliper’s handles and wait 2 seconds before taking the reading. Take a reading of that same site a few more times (release the fold and get a new ‘pinch’ for each measurement) and take the average – each reading should be within 1 or 2 mm of each other. If you don’t have calipers you’ll have to make do with a ruler.
The procedure differs between genders. Males take measurements at the pectoral, abdominal and thigh regions and females take measurements at the triceps, suprailiac and thigh regions. The locations for both sexes are illustrated below.