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 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.

Lean Body Mass Calculator

Your age
Your weight
Your height
Your waist
Your iliac
Your hips

  • 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

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