Heroes 3 spell calculator

Combat spells are cast from the hero's spell book, one per round; the book shows each spell's effect at the hero's current Spell Power and school level, but nothing for another level, another target or an artifact the hero does not wear.

A spell's value is its effect at the cast level plus its coefficient times Spell Power. The best of Fire Magic, Air Magic, Water Magic, and Earth Magic among the spell's schools sets that level, an orb of the spell's school multiplies the value by one and a half, and Sorcery adds its share; golems take part of it and opposed elementals take double. Pick a spell and a target stack to see the value, the mana cost and the losses.