The following is an extract from the readme for AMc's 'twometer.pp2', it expresses what I beleve to be the most popular convention for converting between real world and Poser units. Quote: ...information from the Poser manual* which states that "Poser considers one DFX unit equal to the male figure's height--about six feet." In the Poser universe, the standard poser unit equals one and a third DFX units, or eight feet (which makes for a nice round number.) The poser unit is the distance that the translate tools or parameter dials need to move an object a single unit in Poser. (i.e. A "y-trans" setting of 1.000 would move an object 8 feet above an object with a "y-trans" setting of 0.000) Since the male figure is 0.750 poser units tall it's easy to do the math and divide the units into their English and Metric counterparts. Here's the breakdown: 1 foot = 0.125 poser units (a "box" prop scaled to 125% would be a cubic foot) 1 meter = 0.410 poser units (a "box" prop scaled to 41% would be 10 cubic centimeters)