Armor and Effective HP in Dota 2 | Calculator
What is Effective HP in DOTA 2?
Effective HP(EHP) is the total amount of physical damage a unit can withstand based on its armor. It’s a measure of how much damage a unit can take before being defeated.
Effective HP Calculator
Effective HP:
Damage Multiplier:
Armor and Effective HP
For every 1 armor, you get an EHP of 6% added to your initial HP. This is a linear increase, so the EHP increase is just a constant 6% per armor. This happens because armor provides physical damage resistance before dealing with actual damage. To compute your armor use the formula below:
Armor = ( (Base Armor + (Σ Current AGI stat)/6) × (1 – Armor Negation) ) + Bonus Armor
Σ Current AGI stat = Base Agility + AGI gain
Armor Negation is an ability or item that will ignore armor, this is usually removed in percentages.
Unlike some systems where each point of a stat provides diminishing returns, here, each point of armor has the same impact on both health and survivability. Gaining 1 armor always increases the EHP by 6%. Armor is less effective when it’s in negative values. As armor becomes negative, the total EHP decreases. However, it never goes below 50%. This means even with very low or negative armor, a unit can still withstand a significant amount of damage.
Source: https://dota2.fandom.com/wiki/Armor#Effective_HP
Reducing the armor of a Hero from 10 to 0 is more effective than reducing the armor of a Hero from 0 to -10.
Formula to get Effective HP
The first step to getting the Effective HP of a Hero is knowing the damage multiplier that will affect the HP of your Hero like damage reduction and damage amplification.
Damage reduction (DR) = (0.06*Armor)/(1+0.06*Armor)
Damage Amplification (DA) = (0.06*|Armor|)/(1+0.06*|Armor|)
To get the damage multiplier, we need to combine the two formulas:
Damage Multiplier(DM) = 1 – ( (0.06*Armor)/(1+0.06*|Armor|) )
To get the Effective HP the formula is:
Effective HP(EHP) = Current HP / Damage Multiplier
Source of the formulas: https://liquipedia.net/dota2/Armor
| Armor | Damage Multiplier | EHP (for 1000 current HP) |
|---|---|---|
| 10 | 0.6250 | 1600.00 |
| 5 | 0.7692 | 1300 |
| 4 | 0.8065 | 1240 |
| 3 | 0.8475 | 1180 |
| 2 | 0.8929 | 1120 |
| 1 | 0.9434 | 1060 |
| 0 | 1.0000 | 1000 |
| -1 | 1.0566 | 946.43 |
| -2 | 1.1071 | 903.23 |
| -3 | 1.1525 | 867.65 |
| -4 | 1.1935 | 837.84 |
| -5 | 1.2308 | 812.50 |
| -10 | 1.3750 | 727.27 |
