Hope your good at math

this is what I found and it might help you.
"To make the completed Pepakura piece scaled to fit your body type, you'll need to do a little math. I learned the following formula from the 405th.com forums. Measure your height in inches (I'm 6 foot even, so that's 72 inches). Then add 3 inches to that measurement.(for me, 75 inches). Divide that by 86(75/86=0.872093). Then multiply that number by the scale of the current piece you are working on (Right Bicep's scale is 30.342, so 30.342x0.872093=26.461045). Take that last number(26.461045), go to 2DPatternWindow, then click "scale up/down development by specifying value...". Highlight that current scale and replace it with the one you just calculated."
Not my post so I will not take credit for it, I found it.