Seat angle question

I apoligize in advance as I’m sure this info is on this site somewhere but I can’t find it. Is there a chart somewhere? The tip of my saddle is exactly even with the MBB. What is my effective seat angle? The bike specs show the down tube at 75 degrees.

Thanks

http://www.slowtwitch.com/mainheadings/techctr/anglefinder.html
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