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Y math? Use this: http://yojimg.net/bike/web_tools/stem.php
amey-
Well it's just basic geometry. If you move a stem down and the saddle stays in the same place, the distance between saddle and bars will increase, assuming your steerer doesn't describe an arc with your saddle nose as the centre point.
Cheers tho, and @edscoble
fizzy.bleach
Saddle-bar drop question.
I had a fit about 18 months ago and got a fairly small drop of 34mm, possibly because I'm tall, (was) pretty inflexible and asked the fitter to fit me for an "audax" position. Since then I've gradually removed 2 spacers to drop this down with no noticeable effect, but I've not taken that bike out for long runs. In that time I'm sure my flexibility has improved, due to running-related hip exercises.
TLDR: if I drop the bars (by removing spacers or lowering a quill stem) to accommodate more flexibility in my back/bum/hips/hamstrings, will I need to think about adjusting other stuff as well like reach? Maths says that lowering stem pushes bars slightly forwards...