This uses the formula found in the Blizzard UI, for the Wrath of the Lich King expansion.
The "Attacker Level" field is the level of the player/npc who is causing damage, not receiving damage.
Examples:
- To find out your own damage reduction against the attacks of a raid boss, you would enter level 83 into the "Attacker Level" field, and your own armor into the "Armor" field.
- To find out how much damage reduction another player has against your attacks, enter your own level into the "Attacker Level" field, and your targets armor into the "Armor" field.
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