When you co to the archery shop, they have a tool for measuring your draw length. They'll also be able to confirm the draw length of the bow and measure arrows based on that and the position of the rest, etc. If you have an overdraw, that makes a difference, too. Usually the arrows are cut an extra inch or so, leaving room between the back of the broadhead and the riser. It's really hard to tell you specifics without looking at your bow. That's why you should develop a relationship with a shop. I think the Nock Point is the closest to you.