Values of stats change depending on what stats you already have. Only accurate way is to sim yourself, and then plug those stat weights into something like Pawn to do the adding up for you, for a total score.
I use Pawn, I'm really happy with it. But a tip that I can give you is, not trust this 100% of the times, sometimes even the increase of a good stat does not pay the loss of a great amount of other stats.