Here is a quote from the text file accompaning Freakachu's "TwoMeter.pp2" (from the free stuff).

"the standard poser unit equals one and a third DFX units, or eight feet...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)"