Circumference Bodyfat / Lean Body Mass Calculator
The following calculator gives you an estimate of your % bodyfat and lean body mass based on your weight, height, age and simple tape measurements (i.e. anthropometric measurements). Skin-fold measurements alone tend to underestimate body fat percentage in the obese  and very lean (particularly with low hydration levels). The following calculator is based on equations [2, 3] which are useful for people in these groups as well as people with loose skin after very large weight loses. It is generally accurate to within a few percent. Anecdotally, it has also proven to be reasonably accurate with drug-free, genetically typical bodybuilders.
- Age – your age in years
- Height – your height without shoes
- Waist size – measure around your waist at your navel and also at the point midway between your navel and the bottom of your sternum, and take the average of these two measurements - that is your "Waist" measurement. Stand tall, but do not deliberately suck in your stomach or the estimation will be wrong.
- Iliac – measure around where your upper pelvic bones protrude the most (you can feel for them on either side of your waist/hips)
- Hips – measure around the hips at the maximum protrusion of the buttocks
- Ada L. Garcia, Karen Wagner, Torsten Hothorn, Corinna Koebnick, Hans-Joachim F. Zunft, and Ulrike Trippo, "Improved Prediction of Body Fat by Measuring Skinfold Thickness, Circumferences, and Bone Breadths", Obesity Research, Vol. 13, No. 3, March 2005, pp. 626-634.
- Tran Z.V. and Weltman A., "Predicting body composition of men from girth measurements", Hum Biol. Vol. 60, Feb. 1988, pp. 167-175.
- Tran Z.V. and Weltman A., "Generalized equation for predicting body density of women from girth measurements", Med Sci Sports Exerc. Vol. 21, Feb. 1989, pp. 101-104.
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