To the belly of the handle? So how are you going to shoot arrows?
Before the confound device came about, we actually knew that an arrow (hunting arrow especially) could not come back past the back of the bow at the arrow shelf. For obvious reasons.
At some point, common sense just flew out the window and we needed a formula to figure it out.
Well..fact is, you still need to keep your broadheads on the backside of the bow at draw.
So...your draw lenght should be somewhat shorter than that. Measure it to the back of the bow...it will be consistent with every bow you use, and makes more sense than trying to use math forumla. Some people could screw-up making a broom handle.