Someone posted this in another thread: http://www.habcycles.com/fitting.html

The angle is from the horizontal. So, add the stated stem angle to (90 - head tube angle). A typical road bike is 73*, so your 7* stem is probably about 24* from the horizontal [ie, 7 + (90 - 73) = 24], but you can round to 25*.

Your effective reach is about 90 mm. Use the chart to find the right stem to get you more height while keeping your eff. reach to about 90 mm. For example, a 110mm/17*(~35* from horizontal) stem will give you about a 2 cm increase in height with the same, 90 mm, reach.