Quote:
Originally Posted by jackie_w
This usually means it's been converted by Calibre. Font sizing is a bit complex in Calibre but all its font scaling seems to use pts as input and ems as output. If your source is 12pt and you convert in Calibre with base font-size set to 12pt then you end up with an epub whose main body text has font-size 1em. Thus 1.29167em is 15.5pt and 1.41667em is 17pt. This probably means 15.5pt and 17pt formed part of the Calibre Convert - Look&Feel - Font-size key string when the epub was created.
I've probably made that clear as mud 
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NOT at all - I figured that fractions weer being converted somewhere to create those weird decimals, but did not guess 17/12 or 15.5/12. I leave the calibre font size key string on default, but tweak most large values down a little in css, if they look overpowering on Sony.