The following formula was used to make the above calculations:
Eval. Int. Bonus: ((EvalInt * 3) / 100) + 1
Intelligence Bonus: (INT / 10) (Drop decimals from result)
GM Inscription Bonus: 10% Damage Bonus
Spell Damage Increase: Int. Bonus + Inscr. Bonus + Spell Damage Increase Items*
Total Damage: (Base Damage * Eval. Int. Bonus) * ((Spell Damage Increase / 100) + 1) (Drop decimals from result)
Mind Blast damage: Base Damage + ((Magery + Intelligence) / 5) (Drop decimals from result)
* Spell Damage Increase Items effects are capped at 15% in Player vs. Player combat.
Please note that the formulas on this page have not been confirmed by the developers and may be slightly inaccurate.