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**Lickmybubble**:

That link is a terrible calculation. 25 MR is going to be somewhere around 7% Magic Resist, not 20 or 25%.

25 MR is approximately... no, it straight up IS 25% more effective health vs Magic Damage. So with 3k HP it's around 750 more EHP. However, that's only against magic damage, the 200+5% works on magic, physical, and true. With 3k health in addition, they'd provide 360 (the % would apply to the 200 as well, I reckon) or more (I don't feel like doing the limit of the 5% gains on itself).

As for how Resistance -> EHP works...

The "resist percentage" R is r/(r+100) percent less damage taken, where r is your resistance.

Damage Taken is thus D - DR, or rather, damage allowed is D(1-R)

Set D(1-R) equal to your HP (since we're trying to find you effective health): D(1-R)=H

Move the damage allowed % to the other side so it's an HP multiplier instead of a damage multiplier: D= H/(1-R)

Replace R with its r form: D = H / (1- r/(r+100))

Do some algebra: D = H / (((r+100) - r)/(r+100)) = H / (100/(r+100)) = (Hr + 100H) / 100

Rearrange: D = H + H(r/100)

Your effective health is your Health plus 1% per point of resistance.

EHP is a much better model for resistances than damage reduction, as it turns it into a personal buff instead of an enemy debuff.

As to the stats, 25 MR is *exactly* 20% damage reduction, and 100 MR is *exactly* 50% damage reduction. it's just they do this by providing 25% and 100% more effective health.

If the 1/4 gives 1/5 redux is confusing you think of it this way. You're at 4/4 and you add 1/4. You're now at 5/4.