This is a little SpellPower Damage calculator, based on the Post, that can be found here.

You need to select the Spell from the SpellList-Dropdown, followed by the selection of your Items you are carrying. The Spell-Damage List will be calculated in the following way:

(1) This means, if you select a Item, that will modify the Damage of a Spell, the base damage in the table will refelct this increase as well for all Damage increase Items. Items increasing the critical damage, will be applied in the critical rows accordingly.

For Damage per Spellpoint (DpS) calculation, the same rules apply as above. The formular is as follow:

The average Damage per Spellpoint calculation simple shows the avarage Damage of the Spell in relation to the DpS.

If you find an Error / Bug, please report on my post, that can be found here.

Select Damage Amplifier Enhancement
Auto (avail to caster level)
None
Manipulation I (+10%)
Manipulation II (+20%)
Manipulation III (+30%)
Manipulation IV (+40%)
Select Damage Amplifier Item
none
lesser (+10%)
normal (+20%)
improved (+30%)
greater (+40%)
superior (+50%)
Select Critical Amplifier Enhancement
Auto (avail to caster level)
None
Lineage of Deadly I (+.25)
Lineage of Deadly II (+.5)
Lineage of Deadly III (+.75)
Select Critical Amplifier Item
none
minor (+0.25)
lesser (+0)
normal (+0.25)
greater (+0.25)
superior (+0.5)