What is Effective Health (EHP) in League of Legends?

Effective Health is a calculation of how much total raw damage a champion can take before dying, factoring in both their maximum HP and their resistances (Armor/MR).

What is the EHP formula for LoL?

The formula is EHP = HP * (1 + Resistance / 100). This shows that every 100 points of resistance effectively doubles your health pool against that specific damage type.

Which is better to buy: Health or Armor/MR?

It depends on your current ratio. If your Health is high relative to your Armor, Armor will increase your EHP more per gold. If your Armor is high but Health is low, buying Health is more efficient.

How does True Damage affect EHP?

True damage ignores resistances. Therefore, your EHP against true damage is always exactly equal to your raw HP pool.

Why does my EHP change depending on the enemy?

EHP is damage-type specific. You have a "Physical EHP" and a "Magic EHP." If the enemy has Armor Penetration, they effectively reduce your Physical EHP.

Does EHP account for shields?

Shields act as temporary HP. You can calculate your EHP with a shield by adding the shield value to your current Health in the calculator.

What is the "Golden Ratio" for tankiness?

A common rule of thumb is to aim for 100 Armor/MR for every 1000 HP you have. This balance usually maximizes EHP for your gold.

How do I increase my EHP the fastest?

Buying efficient "hybrid" items that provide both Health and Resistance (like Sunfire Aegis or Spirit Visage) is usually the fastest way to boost EHP.

Does level affect EHP?

Yes, most champions gain base health and base armor/MR per level, naturally increasing their EHP as the game progresses.

Is EHP the only thing that matters for a tank?

Not entirely. While EHP measures survival, factors like damage reduction (Alistar R), attack speed slowed (Frozen Heart), and healing/regeneration also play massive roles in actual combat.

Interpreting Your Result

A Physical EHP of 5,000 is a decent baseline for mid-game bruisers. A late-game tank should aim for 10,000 to 15,000 EHP against their primary threat damage type.

✓ Do's

•Calculate both Physical and Magic EHP to find your vulnerabilities.
•Include health from runes (like Overgrowth) in your HP input.
•Adjust your Armor/MR based on enemy penetration items for an "Effective EHP" check.
•Factor in shields from items like Sterak's Gage or Gargoyle Stoneplate.

✗ Don'ts

•Don't ignore Health—too much resistance with no HP makes you vulnerable to true damage.
•Don't assume a high health bar means you are tanky if your resistances are zero.
•Don't forget that some items provide "straight reduction" (like Randuin's Omen) which effectively increases EHP without changing stats.

How It Works

The League of Legends Effective Health (EHP) Calculator is the most advanced tool for theorycrafters and tank players. While your health bar shows a simple number, your "Effective Health" is the real measure of your durability. Every point of Armor and Magic Resist increases the amount of damage you can take by 1% of your max health. Use this calculator to find the perfect balance between buying Health and Resistances, ensuring you are as unkillable as possible on the Rift.

Understanding the Inputs

Health: Your current or maximum HP. Armor: Your total physical defense. Magic Resist: Your total magical defense.

Formula Used

Effective Physical HP = Health × (1 + Armor / 100) Effective Magic HP = Health × (1 + Magic Resist / 100) Note: For Armor/MR < 0, a different mitigation formula applies.

Real Calculation Examples

12000 Health and 100 Armor: Effective Physical HP = 2000 * (1 + 100/100) = 4000. It takes 4000 raw physical damage to kill you.
21500 Health and 50 MR: Effective Magic HP = 1500 * (1 + 50/100) = 2250. It takes 2250 raw magic damage to kill you.
33000 Health and 200 Armor: Effective Physical HP = 3000 * (1 + 200/100) = 9000.

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The Comprehensive Guide

League of Legends Effective Health (EHP): The Master Guide to Durability

Have you ever wondered why a 4000-HP Cho'Gath dies in seconds, while a 2500-HP Poppy seems to live forever? The answer lies in Effective Health (EHP). In League of Legends, your health bar is only half the story. The other half is your resistances. This guide will teach you the math of EHP and how to use it to optimize your tankiness.

What is Effective Health (EHP)?

Effective Health is a metric that represents the amount of raw damage an enemy must deal to kill you. It is the result of applying your damage reduction (from Armor and MR) to your total health pool. While your "raw HP" might be 2000, your "effective HP" against a Physical assassin might be 5000, meaning they have to dish out 5000 damage before you hit zero.

The EHP Formula

Calculating EHP in League is surprisingly simple and linear. Every point of resistance adds 1% of your maximum health to your effective durability against that damage type.

EHP = HP × (1 + Resistance / 100)

This simple relationship leads to some powerful insights:

100 Armor: Doubts your Physical EHP (200% survivability).
200 Armor: Triples your Physical EHP (300% survivability).
300 Armor: Quadruples your Physical EHP (400% survivability).

The "Golden Ratio": Balancing HP, Armor, and MR

Because EHP is a multiplicative formula (HP × Resistance), there is a mathematical "sweet spot" for spending your gold. If you have 5000 HP but 0 Armor, buying Armor is incredibly efficient. If you have 100 HP but 500 Armor, buying Health is much better.

The standard rule of thumb: For every 1000 HP you have, aim for roughly 100 of each resistance.
- 2000 HP → 100 Armor / 100 MR
- 3000 HP → 200 Armor / 200 MR
- 4000 HP → 300 Armor / 300 MR

Building according to this ratio ensures that your next gold spent provides the largest possible increase to your EHP pool. Going too heavy into one stat while ignoring the other leads to "diminishing returns" on your gold efficiency.

Effective Health vs. Different Damage Types

In League of Legends, you don't have just one EHP value. You have three distinct "survivability thresholds":

1. Physical EHP

Calculated using your Armor. This is what protects you from the enemy ADC, AD Mid-laners (like Zed or Talon), and Turret shots. If the enemy team is full AD, this is the only number that matters.

2. Magic EHP

Calculated using your Magic Resist. This protects you from mages and AP assassins. Items like Kaenic Rookern or Force of Nature are designed to bolster this specific number.

3. True Damage EHP

IMPORTANT: True damage ignores all resistances. This means your EHP against true damage is always equal to your raw HP. If you are playing against a Vayne, Camille, or Master Yi, buying Armor won't help you live longer. You must stack raw Health (like Heartsteel or Warmog's Armor) to increase your survival time.

The Impact of Penetration on EHP

When an enemy buys Lord Dominik's Regards or Void Staff, they aren't just "reducing your stats"—they are effectively destroying your EHP. Let's look at the math:

You have 2000 HP and 200 Armor (6000 Physical EHP).
An enemy buys 40% Armor Penetration.
Your Armor is treated as 120 for their attacks.
Your EHP against that enemy drops to 2000 × 2.2 = 4400 Physical EHP.

By buying one item, the ADC "deleted" 1600 of your effective health points. This is why penetration is the ultimate counter to tanks.

EHP and Sustain: The Hidden Multiplier

EHP becomes even more powerful when you factor in Healing and Shielding. If you have a champion like Mundo or Warwick who heals 1000 HP during a fight, that 1000 HP is amplified by your resistances.
- With 0 Armor, 1000 healing = 1000 extra damage absorbed.
- With 300 Armor, 1000 healing = 4000 extra damage absorbed.
This is why resistances are mandatory for "drain tanks." Every hit point they regain is worth four times as much as a squishy's hit point.

How to Use the EHP Calculator to Carry

Analyze the Threat: Identify who is dealing the most damage to you. Is it the 10/0 Orianna? Then focus on your Magic EHP.
Check Your Current Stats: Input your HP and the relevant Resistance. Note the result.
Theorycraft Your Next Item: Look at a Chain Vest (+40 Armor) vs. a Ruby Crystal (+150 HP). Input the new stats into the calculator. Whichever gives the higher EHP increase is the mathematically superior buy for your current situation.
Don't Forget the Passives: Remember that some items like Randuin's Omen or Frozen Heart provide "invisible EHP" through crit reduction or attack speed slows that aren't shown in the raw stats but are vital in combat.

Conclusion

The LoL Effective Health Calculator is the ultimate tool for anyone serious about the math of the Rift. By shifting your perspective from "How much health do I have?" to "How much damage can I take?", you gain a massive edge in itemization. Balance your resistances, stack your health against true damage, and monitor enemy penetration to remain the unkillable force your team needs. See you in Challenger!

Usage of This Calculator

Who Should Use This?

Professional theorycrafters, tank/bruiser mains looking to optimize their items, and players who want to understand why they are dying so fast despite having "high health."

Limitations

The calculator assumes raw incoming damage. It does not account for critical strikes (which deal more damage but don't change your EHP) or armor-shredding abilities that change your stats mid-fight.

Real-World Examples

The Malphite Wall

Scenario: Malphite with 4000 HP and 600 Armor.

Outcome: Physical EHP = 4000 * (1 + 6) = 28,000. He can absorb 28,000 raw physical damage.

The Squishy ADC

Scenario: Jinx with 2000 HP and 80 Armor.

Outcome: Physical EHP = 2000 * (1.8) = 3600. A single 1000 damage crit removes nearly 30% of her EHP.

Summary

The LoL Effective Health Calculator is the ultimate tool for mastering the Rift's defensive math. By balancing your Health and Resistances, you can mathematically ensure you have the highest possible survival threshold for every gold spent.

League of Legends Effective Health Calculator