Howdy, My first thought was 'Yeah, silly question". But, it would be nice to know we were all talking about the same thing. I believe the official AMO definition is from the center, or balance point, of the arrow shelf to the string, plus 1 3/4 inch for the arrow head. I find the whole 1 3/4" business a little confusing though. I guess it makes sense if the draw length is referring more to the length of the arrow being drawn, than to the distance the string is drawn.
Since I don't put risers or shelves on my bows I usually just measure from the back of the bow and forget about the 1 3/4'. I figure that's pretty close to where the arrow rests on my knuckle. Ron