In case this hasn't been posted recently or at all: if you want to calculate the number of upvotes and downvotes from the current comment/post karma and % positive seen by cursor hover, this is the formula:
# upvotes = karma*%positive/(2*%positive-100%)
#downvotes = #upvotes - karma
This only works for non-zero karma. Maybe someone wants to write a script and make a site or a browser extension where a comment link or a nick can be pasted for this calculation.
This only works for non-zero karma.
The source code of the pages contains hypothetical % positive for the cases when a comment gets upvoted or downvoted by 1 point, so sufficient information about comments with zero karma is always present as well.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.