Originally Posted by billridesbikes

Here is the data in a graph for the ~100 responses with self reported height (inches) and reported frame size (converted to cm where needed). For multiple reported sizes I used either the middle one or the 'favorite' one.
So next time just take 95% of your height in inches and subtract 10.5 and that is your frame size in cm at least for BF members.... well, better take a test ride anyway.