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As far as I can tell, it's something like this:

damage reduction = armor / (armor + 100)

Is this accurate?

Matthew
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2 Answers2

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Yes, that's correct. The calculations are:

Armour Resist: Damage Reduction = Total Armor / (100 + Total Armor)

Magic Resist: Damage Reduction = Total Magic Resistance / (100 + Total Magic Resistance)

Kevin Yap
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    And despite what it might seem, Armor does not have diminishing returns. – Raven Dreamer Aug 16 '10 at 22:36
  • @Raven: That's true, but it's important to remember that a lot of armor is not better than a mix of armor/hp. Because armor boosts your survivability by a percentage of your hp, and most hp items give a flat hp boost, it's often better to buy hp once you have significant armor. I'm sure you already know this, I'm just leaving it here for any other readers. – Matthew Aug 19 '10 at 17:04
  • @Raven Dreamer I would love for you to explain how Armor doesn't have diminishing returns. As is clearly stated in the formula, it does have diminishing returns. A diminishing return means that the more armor you add the less damage is reduced for each point of armor. – Steven Oxley Nov 03 '10 at 19:47
  • @Steven Oxley -- you're looking at it from the wrong perspective. While the amount of armor required per point of %damage reduction does increase (the diminishing returns you're seeing), the effectiveness per point of armor doesn't decrease. I'd open a new question if you'd like to know more -- comments aren't really suited to the indepth explanation a fuller answer would require. Please don't condescendingly assume I don't know what "Diminishing Returns" mean. – Raven Dreamer Nov 03 '10 at 19:54
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    @Raven Dreamer http://gaming.stackexchange.com/questions/10244/why-would-someone-say-that-adding-armor-in-league-of-legends-does-not-have-dimini Explain away. I didn't mean to be condescending. I was just making sure we had a definition of "Diminishing Returns" to work off of. – Steven Oxley Nov 04 '10 at 16:24
  • @Raven I think your phrasing is slightly off. In terms of Effective Hit Points armor does not have diminishing returns. In terms of Damage Reduction it most certainly does (every point reduces your RoI for the next point). There are two concepts here and its easy to mistake one for the other. – tzenes Nov 04 '10 at 17:03
  • @Steven Oxley -- no worries. I'll gladly write up the longer answer for you. @Tzenes Yes, I agree with you. That is what I was trying to convey. – Raven Dreamer Nov 04 '10 at 17:07
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When it comes to reduction It is indeed diminishing, but when You work out the formula for Ehp (Estimated hp) 1 point of armor actually always gives 1 additional % of hp based on the base hp.