I am a visual designer, working on an android design and I\"m trying to spec my PSD file for our engineers. I cannot seem to find any documentation regarding the conversion
In contrast to dp (and sp with minus the user text sizing factor), pt has pretty much the exact same physical measurement. Dp is more or less a rough approximation, since it uses the same factor for a wide dpi range.
You cannot convert pt to sp, like said by Flavio. You can, however convert pt to dp roughly (+/- 30% in extreme cases, but at least expect +/-10%).
Using the dpi buckets (ldp=120,mdpi=160,hdpi=240,xhdpi=320) the most generic conversion factor would be x0.45 (= 72/120*0.75 = 72/160*1 = 72/240*1,5 = 72/320*2) if using the exact dpi bucket values.
For more precise factors:
So 12 pt would be on...
You could use the same values for sp, but keep in mind, that these could be in/decreased by the users settings.