I found this on the Parker website, maybe with some help from a friend you can use it to determine your bows drawlength. Good luck...
How is draw length measured?
Draw length is measured when the bow is at full draw and being held in the "valley" or the highest let-off point on the cam. The measurement is taken from the point where the nock is attached to the string to a point 1-3/4" in front of the pivot point of the grip.
In other words, from the nocking point on the string to roughly the front edge of the bow. Draw length is NOT measured to the arrow rest mounting hole as many people think.