+Spell damage vs +Chance to Crit Items

[Skandranon]

A good rule of thumb is 1% to crit increases your damage by 1% (for a frost mage, a bit more for fire mages because ignite stacks).

Frostbolt does roughly 450 damage at it's highest rank, so to increase DPS by 1% you would need 45/.857 = 53 +frost damage. (Frostbolt is only a 3 second cast, so recieves only 0.857 of your bonus.)
[right][snapback]89964[/snapback][/right]

Wogan, this calculation is to raise average damage by ten percent, not one. 1% crit is not equal to +53 frost damage.