Armor Pen Calculator LoL
Estimate final armor after reductions, percent armor penetration, percent bonus armor penetration, and level-scaled lethality, then see the physical damage multiplier and EHP swing.
⚔ Champion And Item Presets
🎯 Armor Pen Inputs
Full Calculation Breakdown
📊 Live Comparison Grid
No Penetration
Reductions Only
Percent Pens
Full Setup
🧮 Current Calculation Snapshot
📘 Modifier Order Reference
| Order | Layer | What It Changes | Calculator Treatment |
|---|---|---|---|
| 1 | Percent armor reduction | Reduces the target's total armor for everyone hitting that target. | Multiplies base and bonus armor by the remaining percent. |
| 2 | Flat armor reduction | Removes a flat amount of target armor after percent reduction. | Consumes remaining bonus armor first, then base armor, and may go negative. |
| 3 | Percent total armor penetration | Ignores a percent of the remaining positive armor for this attacker. | Applies to the remaining base and bonus armor portions. |
| 4 | Percent bonus armor penetration | Ignores only the remaining bonus armor portion for this attacker. | Leaves base armor intact and reduces only the bonus armor part. |
| 5 | Lethality | Flat armor penetration after scaling by attacker level. | Subtracts from positive armor after all percent penetration layers. |
🛡 Armor Multiplier Reference
| Final Armor | Physical Damage Multiplier | Physical EHP On 2000 HP | Practical Read |
|---|---|---|---|
| -20 armor | 116.7% | 1714 EHP | Negative armor makes physical hits stronger than raw damage. |
| 0 armor | 100.0% | 2000 EHP | No mitigation and no bonus damage from armor math. |
| 50 armor | 66.7% | 3000 EHP | Common early bruiser or marksman armor range. |
| 100 armor | 50.0% | 4000 EHP | Physical damage is cut in half before other effects. |
| 200 armor | 33.3% | 6000 EHP | Percent penetration usually starts gaining more value. |
| 300 armor | 25.0% | 8000 EHP | Frontline targets still keep high EHP after flat penetration. |
🗡 Preset Scenario Reference
| Preset | Main Pen Layer | Target Profile | What To Watch |
|---|---|---|---|
| Zed Lethality vs ADC | Scaled lethality | Low bonus armor carry | Flat penetration has strong value while armor is low. |
| Pantheon Cleaver Stack | Percent reduction | Mid armor skirmisher | Reduction helps allied physical damage too. |
| Marksman LDR vs Bruiser | Percent total penetration | High bonus armor fighter | Percent penetration grows with target armor. |
| Yasuo Ult vs Tank | Bonus armor penetration | Large bonus armor tank | Base armor remains, so the final armor may stay meaningful. |
| Team Shred Combo | Reduction plus penetration | Stacked frontline | Layering can create a bigger EHP swing than one stat alone. |
⏱ Lethality Scaling Reference
| Attacker Level | Scaling Factor | 18 Lethality Becomes | 36 Lethality Becomes |
|---|---|---|---|
| Level 1 | 62.2% | 11.2 flat pen | 22.4 flat pen |
| Level 6 | 73.3% | 13.2 flat pen | 26.4 flat pen |
| Level 11 | 84.4% | 15.2 flat pen | 30.4 flat pen |
| Level 13 | 88.9% | 16.0 flat pen | 32.0 flat pen |
| Level 16 | 95.6% | 17.2 flat pen | 34.4 flat pen |
| Level 18 | 100.0% | 18.0 flat pen | 36.0 flat pen |
💡 Armor Pen Tips
Armor penetration in League of Legends follow a specific order of operations. The order of operations for armor penetration determines the amount of damage that will be dealt to a target. The game dont apply all forms of armor penetration to the target at the same time.
Instead, the game applies armor penetration in a specific sequence. The game first applies armor reduction, then percent penetration, then bonus armor penetration, and finally lethality. Each of these form of armor penetration can impact the amount of armor that the other forms of armor penetration see.
How Armor Penetration Works and How to Use the Calculator
Thus, the specific order in which the game applies armor penetration is the reason that two champions that has the same amount of lethality may deal different amounts of damage to the same target. The armor penetration calculator allow you to enter a variety of parameters for the target that you are about to attack. These parameters includes the armor of the target, the base armor of the target, your current level, and various sources of armor penetration.
The armor penetration calculator will apply armor penetration in the proper order to your target, and will display for you the armor that your target will have after armor penetration are applied to them. Most player will not manually calculate armor penetration. Instead, they will rely upon there intuitions about the value of different forms of armor penetration, often overvaluing lethality and undervalue percent penetration.
However, by watching the final armor number for the target update as you select different options, you can gain an understanding of the relative value of the different forms of armor penetration. Armor reduction is a type of armor penetration that will impact the armor of the target for everyone on your team. For instance, if one of your champion has 30% armor reduction, each teammate will see a reduction in the armor of their target.
For instance, if the target has 300 armor, each teammate will only have to deal with 210 armor. The armor penetration calculator will show you how much armor penetration reduction there will be before armor penetration that affects individuals is applied to the target. Armor penetration reduction have diminishing returns when the target has low armor.
Due to these diminishing returns, armor penetration reduction is usually applied in conjunction with percent penetration instead of being used as the only form of armor penetration. Lethality increase with your champion level. At level 1, lethality is only 62% efficient, but at level 18, lethality becomes 100% efficient.
This difference in efficiency can impact your decisions about items, encouraging you to buy items at level 9 instead of level 13, for instance. The armor penetration calculator accounts for your level, allowing it to calculate the effectiveness of lethality at any level. Thus, you can use the armor penetration calculator to determine whether you should buy an item with lethality at level 9 or an item with percent penetration at level 13.
Bonus armor penetration only apply to armor that the target gains from items, runes, or abilities. Thus, bonus armor penetration will not impact the base armor of the target. Those champions with high base armor but low items will gain little from bonus armor penetration.
However, bruisers that has high armor from items will lose alot of their tankiness when hit with bonus armor penetration. The armor penetration calculator allows you to view the armor penetration that will be applied to the bonus armor of the target instead of the base armor of the target. Effective health is a measurement of the health that the target will have remaining against physical damage.
Reducing armor will increase the damage that you do to the target, but it will also reduce the amount of effective health that the target will have against your physical damage. Thus, a small increase in damage can result in a more large decrease in the effective health of the target. This is important against those opponents with heals or shields.
Armor penetration is most effective when you use the correct type of armor penetration for the correct type of target. Lethality is better for marksmen with low armor, percent penetration is better for tanks with high armor. By using the armor penetration calculator, you can test out different type of armor penetration for your champion against your specific target.
Thus, the armor penetration calculator will help you to decide which item to buy first and which enemy to target in a fight.
