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This is quoted from tivelositos from the sticky in the mage forums by Swindy, possibly one of the most helpful people to mage damage calculations in TBC
"So lets convert those formulas to a real world example. Let's take a fire mage with 900 spelldamage, 100 hit rating, and 30% to crit with fire.
+50 spell damage would mean (B+c*(D+n))/(B+c*D) = (902.5+1.035*(900+50)) / (902.5+1.035*900) = 1885.75 / 1834 = 1.0282 which is 2.82% more DPS.
+50 spell crit rating would translate to 2.26244 more crit chance (1.1*(C+n)+1) / (1.1*C+1) = (1.1*(0.3+0.0226244)+1) / (1.1*(0.3)+1) = 1.35488684 / 1.33 = 1.0187 which is 1.87% more DPS.
+50 spell hit rating is 3.96825 more hit chance on top of the 7,93651 hit chance the mage allready has (0.83+H+n)/(0.83+H) = (0,83 + 0,0793651 + 0,0396825)/(0,83+0,0793651) = 0,9490476/0,9093651 = 1,0436 meaning a whoping 4,36% more increase in DPS!"
"So lets convert those formulas to a real world example. Let's take a fire mage with 900 spelldamage, 100 hit rating, and 30% to crit with fire.
+50 spell damage would mean (B+c*(D+n))/(B+c*D) = (902.5+1.035*(900+50)) / (902.5+1.035*900) = 1885.75 / 1834 = 1.0282 which is 2.82% more DPS.
+50 spell crit rating would translate to 2.26244 more crit chance (1.1*(C+n)+1) / (1.1*C+1) = (1.1*(0.3+0.0226244)+1) / (1.1*(0.3)+1) = 1.35488684 / 1.33 = 1.0187 which is 1.87% more DPS.
+50 spell hit rating is 3.96825 more hit chance on top of the 7,93651 hit chance the mage allready has (0.83+H+n)/(0.83+H) = (0,83 + 0,0793651 + 0,0396825)/(0,83+0,0793651) = 0,9490476/0,9093651 = 1,0436 meaning a whoping 4,36% more increase in DPS!"