Wanted to comment on the formulas for mages, because the ones, available at this thread's OP are somewhat crude.
Crit ratings for lvl70 are calculated with this formula: CritRate/1148*52, which is about equal to 22,076923 rating per crit%.
Formula taken from here:
http://wowwiki.com/Combat_Ratings
The best explanation of how int works is found in this reply, earlier in this thread:
Originally Posted by Arawethion
Seems like just about 80 Int/crit% for a Mage for me. Stripping naked:
(435-151)/(6.35-2.80)=80.0.
Yeah, it's only one data point, but the two-decimal precision of the default UI doesn't leave much room for rounding error.
This would yield a base crit for Mages of
0.9125 + Int/80.
Yielding an "intended" base Int value for Mages (defined as: Int required to attain precisely 5% crit) of exactly 327. Seems reasonable.
Probably a more handy way to think of it:
Crit = 5 + (Int-327)/80
|
Proof?
I am a 402 int mage with 249 crit rating, currently sitting at 17,21% crit for untalented spells (non-fire basically).
If we assume 22,1 crit rate for 1% crit and 78,5 int for 1% crit, the numbers add up only if you introduce a 0,82% base crit value.
However, if we assume that CritRate / 1148 * 52 + 5 + (Int - 327) / 80 formula, than the numbers add up nicely, with the formula giving us a 17,21625 crit rating (well within 17,21% crit, shown in Armory).
I won't provide my armory link, since it will expire as soon as i get an item upgrade

, but if you still want it feel free to look up Maxi on Defias Brotehrhood EU. Or check the numbers against your own mage stats.
Rundown: 1148 / 52 Crit rating for every 1% crit, as well as 80 Int for 1% crit, with (5 + (Int - 327) / 80 ) formula for int.
Yes, i am nitpicking, but stuff like that is important if you want to make a perfect mage dps spreadsheet :P