From the back as others have said. I think the "deepest part of the grip + 1 3/4"" was an industry move trying to standardize this measurement. My draw length (arrow length really) shortened up when I went traditional. Draw length depends on so many factors, knocking point, grip and stance etc... For me, what length of arrows do I need to make for them to be right for me. I think it's that simple. Happens to be 27 inches from the back of the bow to the string. I could change a few things up and that distance would change some, so it's really a personal thing for each shooter which only resembles the industry standard IMO.