That is why I gave you the method using the rear tire against the wall. It allows you to make correlated measurements that yield stack and reach by subtraction. I don't bother calculating frame stack and reach, because I am working with the built up bike, but the methodology is very similar. Just measure from the wall to the center of the top of the head tube and also from the floor to the center of the top of the head tube. When you subtract the BB to wall and BB to floor from those, respectively, you get stack and reach.