+Spell damage vs +Chance to Crit Items

[Xanthix]

A good rule of thumb is 1% to crit increases your damage by 1%
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I thought that a 1% increased chance to crit would increase your overall damage by 0.5%, because a spell crit by default results in 150% damage, unlike a melee crit which is 200% damage.

Of course, there are various talent points to increase spell crits to 200% or even 250% damage. I don't know if that's what you were talking about.