Formulas:Armor penetration
From WoWWiki
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How does Armor Penetration work? It simply removes armor from your opponent and recalculates their mitigation before your attack. If your opponent has 7700 armor and you have 1500 Armor Penetration, they only have 6200 armor versus your attack. They go from 42.2% mitigation to 37%. Therefore, you’ve increased your damage against them by 9.00%.[1]
