You may want to actually measure your cycling inseam. In stocking feet or bare footed, no cloths but thin undies (or actual, no pad cycling shorts), stand back to a wall on a tile or wood floor (no carpet) and have a buddy shove a hard cover book with a one inch spine up into your crotch until your feet go light and it starts to hurt. Put a mark on the wall at the top of the book spine. Do this three times and average. That is your cycling inseam. Knowing your starting point saddle height and preferred top tube length will help you to size frames. If you have a 33.5 inch cycling inseam, then per the Lemond Formula your saddle stating position, measured from the center of the bottom bracket, along the seat tube to the top of the saddle is 29.6 inches. JFYI.

Me on my CC:

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Thanks Loose Chain. I applied your scientific method (replacing book with “Kung Fu Hustle” DVD case) and measured a 35.5 inseam.