Heroes 3 army strength calculator

The game never shows how strong an army is, yet it uses that strength: when a hero walks up to a neutral stack, the stack weighs the hero's army against itself to decide whether it fights, offers to join or flees.

Strength is the sum of each stack's AI value times its count over the hero's army slots, raised by the hero's Attack Skill and Defense Skill. A neutral stack's strength is its AI value times its count.