Any conversion between Poser and real world units is a matter of convention. The standard convention has been that one foot = 0.125 Poser units, one inch = 0.0104166... Poser units. On this same convention 1 meter = aprox 0.410 Poser units. On this convention a Poser unit is 96 inches, and 96 inches = 8 feet. Poser 5 introduced the option to display units in inches, and it seems that the convention they used in the first release was that one Poser unit = 103.23 inches. I have heard that diffrent releases/service pacs of P5 used diffrent conventions, one of them being 0.125 to the foot, but I haven't verifed this. The standard convention that one foot = 0.125 Poser units is based on work by Freakachu, here is the text of one of his readme files:

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Here's the logic behind the prop. TwoMeter.pp2 and Ruler.pp2 are based on a bit of 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) TwoMeter.pp2 and Ruler.pp2 are meant to approximate the heights of your Poser figures. For the TwoMeter.pp2 prop, each segment of the ruler, up to 150 cm, is approximately 50 cm in the Poser universe. Segments past 150 cm are 10 cm high. For the Ruler.pp2 prop, each segment of the ruler, up to five feet, would be approximately 12 inches in the Poser universe. Segments past five feet are 2.4 inches high. Now if someone could build a Poser scale. AMc *p 167 - - - - - -

There are other conventions such as Dr Geeps. Personally I stick with the one Poser unit = 96 inches = 8 feet, one foot = 0.125 Poser units convention.