User blog comment:Willb32764/Health vs Armor/Magic Resist/@comment-6016076-20150710084448/@comment-38408556-20190203181403

Blaisem is right.

I only did the calculation for "Effective Health = ((100+Armor)*Health)/100" which is given from this website and also makes sense.

But majority of heros have around 85 armor and 2000 health when they are level 18. Additionally, usually you can buy either 1 Armor or 7.6 Health for 20 gold.

Therefore we modify the given equation above, and we get.

"Effective Health = [(100 + (85+Armor)) x (7.6*Health + 2000)]/100"

Notice that each Health point is weighted by 7.6 comparing to one point of Armor.

Now you run a 3D graph generator by letting Effective Health = Z, Armor = Y, and Health = X, then you get.

https://academo.org/demos/3d-surface-plotter/?expression=((100%2B(85%2By))*(7.6*x%2B2000))%2F100&xRange=0%2C+80&yRange=0%2C+80&resolution=33

As you notice, each Armor point gives you more Effective Health for the cost wise.