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League of Legends Burst Damage Calculator

Calculate your exact League of Legends burst combo damage. Combine physical, magic, and true damage output against a specific enemy target to see if you have lethal.

Target Defenses

Your User Stats

Combo Configuration

Calculator Guidelines

Do's

  • ✓ Combine the base damage of all abilities used in your combo before inputting.
  • ✓ Combine the total AD/AP ratios spanning the entire combo rotation.
  • ✓ Include your Ignite damage into the True Damage input if you plan to use it.
  • ✓ Account for item damage (e.g., Luden's or Electrocute) by adding it to base damages.
  • ✓ Adjust target HP to include visible shields (like Null-Magic Mantle or Barrier).

Don'ts

  • ✕ Don't calculate sustained DPS here; this is for 1-combo math.
  • ✕ Don't assume your burst goes through abilities like Tryndamere's R or Taric's R.
  • ✕ Don't forget to add flat penetration stats corresponding to your specific damage type.
  • ✕ Don't include cooldown-based abilities twice if your combo time is under 2 seconds.
  • ✕ Don't ignore the enemy's level-based resistance scaling.

Interpreting Your Result

Overkill (>100% Target HP): Absolute lethal, S-Tier execution. Lethal (100% HP): Perfect execution, A-Tier. Near Lethal (80-99% HP): Requires poke or ignite, B-Tier. Fail (Under 80% HP): Your combo is insufficient, find a different target or wait for more items.

✓ Do's

  • •Combine the base damage of all abilities used in your combo before inputting.
  • •Combine the total AD/AP ratios spanning the entire combo rotation.
  • •Include your Ignite damage into the True Damage input if you plan to use it.
  • •Account for item damage (e.g., Luden's or Electrocute) by adding it to base damages.
  • •Adjust target HP to include visible shields (like Null-Magic Mantle or Barrier).

✗ Don'ts

  • •Don't calculate sustained DPS here; this is for 1-combo math.
  • •Don't assume your burst goes through abilities like Tryndamere's R or Taric's R.
  • •Don't forget to add flat penetration stats corresponding to your specific damage type.
  • •Don't include cooldown-based abilities twice if your combo time is under 2 seconds.
  • •Don't ignore the enemy's level-based resistance scaling.

How It Works

The League of Legends Burst Damage Calculator evaluates the total mathematical burst rotation of a champion. Assassins and Burst Mages rely heavily on their "Time-To-Kill" and "Lethal Thresholds". This calculator processes mixed damage components (Base ability damage, AD/AP ratios, and True damage), runs them through the target's effective defenses in real-time, and determines definitively if your all-in will secure the kill or leave the enemy alive with a fraction of HP.

Understanding the Inputs

Target Max HP: The total viable health of your assassination target. Target Armor & MR: The defense stats mitigating your physical and magic damage elements respectively. Physical Combo Base & Ratio: The flat numbers and combined AD scaling of your physical hits. Magic Combo Base & Ratio: The flat numbers and combined AP scaling of your magical hits. Flat/Percent Penetration: Your mitigation-bypassing stats.

Formula Used

Mitigated Physical Damage = (Physical Base + (AD × Ratio)) × (100 / (100 + Effective Armor)) Mitigated Magic Damage = (Magic Base + (AP × Ratio)) × (100 / (100 + Effective MR)) Total Burst Damage = Mitigated Physical + Mitigated Magic + True Damage Effective Health Remaining = Target Maximum HP - Total Burst Damage

Real Calculation Examples

  • 1Akali Combo (Level 9): 450 Magic Base + 200% AP, 150 Physical Base + 120% Bonus AD, 200 True Damage. Target has 1500 HP, 50 MR, 60 Armor.
  • 2Zed R-E-W-Q-AA: 600 Physical Base + 320% Bonus AD vs 1800 HP target with 120 Armor. Factor in 38 Lethality.
  • 3Evelynn R: 800 Magic Base + 150% AP vs target in execute threshold (50 MR, 20 Flat Pen).

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The Comprehensive Guide

League of Legends Burst Damage Calculator: Determining Absolute Lethal

In League of Legends, playing an Assassin or Burst Mage revolves entirely around one invisible, psychological line: The Lethal Threshold. Knowing precisely when your opponent is mathematically executable separates mediocre players who die attempting impossible combos from challenger players who secure flawless kills. The League of Legends Burst Damage Calculator isolates your combo rotation, factors in overlapping damage types, and evaluates it against enemy defenses to answer the ultimate question: *Can I one-shot them?*

Understanding Burst Formulations

Burst damage is fundamentally different from DPS (Damage Per Second). While DPS represents sustained throughput over a long teamfight, Burst relies on front-loading 100% of your available kit's damage into a narrow 1-to-3 second window. This requires calculating simultaneous variables.

Combo Base Damage = Sum(Ability 1 Base + Ability 2 Base + ... + Active Item Base)

Combo Raw Output = Combo Base Damage + (Your Stat × Combined Ratios)

Effective Enemy HP = Target Max HP + Any Active Shields

The Complexities of Mixed Burst Damage

Many 'One-Shot' champions do not operate strictly in a single damage type. For example, Yone outputs a tremendous amount of Physical Damage, but his ultimate and passive cleave deal Magical Damage alongside it. Ahri utilizes standard Magic Damage but ensures an execution via the True Damage return of her Orb of Deception (Q).

Our calculator mitigates each damage type individually against the target's specific Armor and Magic Resist before summing them up. This demonstrates clearly why building MR against Akali works, but only dampens about 75% of her total burst, since her E and auto-attacks still apply respectable physical coefficients.

The Penetration Check: Why Assassins Need Lethality/Magic Pen

The single greatest multiplier of burst damage against squishy targets is Flat Penetration (Lethality for physical, Flat Magic Pen for magical). Consider a Zed against an ADC with 65 Armor. If Zed builds pure AD, his 2000 damage combo is mitigated by nearly 40%. The ADC survives.

If Zed opts for Lethality items (e.g., Youmuu's Ghostblade, Opportunity), dropping that ADC's Effective Armor to 10 or 15, his 2000 damage combo applies almost entirely as True Damage. The calculation swings from a failed engage into an absolute overkill scenario simply due to how mitigation curves work.

Identifying The Overkill Range

A crucial strategy for high-Elo assassins is understanding "Overkill". If your burst calculator determines your combo does 2800 damage to an ADC who only has 1800 Max HP, you possess a massive Overkill buffer.

  • Holding Cooldowns: If you have an Overkill of 1000 damage, you do not need to use your Ultimate (R) or Ignite to kill the ADC. You can assassinate them with a basic ability rotation (Q+W+E), saving your most powerful cooldowns for the remaining teamfight.
  • Surviving Support Peeling: A high Overkill rating means you can kill the target even if the enemy Lulu casts her shield (E) on them mid-combo. If your burst only exactly matches their Max HP, any external shielding or healing will force your engage to fail.

Unseen Variables in Live Gameplay

While the mathematical outputs of the League of Legends Burst Damage Calculator are exact, player execution is variable. Missing a critical skillshot like Ahri's Charm immediately removes a massive chunk of the 'Combined Ratios' metric. Additionally, runes like Bone Plating or items like Guardian Angel are designed specifically to disrupt the assumptions of an uninterrupted lethal calculation. Utilize the tool to find your baseline "perfect execution" thresholds so that you can consciously adapt when a game throws unpredictable variables your way.

Frequently Asked Questions

Usage of This Calculator

Who Should Use This?

Assassin mains (Zed, Talon, Akali, Evelynn), Burst Mages (Syndra, Veigar, Annie), and competitive analysts determining definitive time-to-kill (TTK) thresholds in high-level match drafts.

Limitations

Assumes 100% accuracy of the stated combo. Does not automatically resolve dynamic mid-combo resistance shreds (like Black Cleaver stacking) unless averaged out. Does not account for damage reduction spells.

Real-World Examples

Case Study A: The Assassin's Threshold

Scenario: Syndra (700 AP, 40 Flat Pen, 40% Magic Pen) initiates a QEWR combo. Combined Base Magic Dmg: 1200. Combined AP Ratio: 250%. Target ADC: 2000 HP, 60 MR.

Outcome: Raw Burst = 1200 + (700 * 2.5) = 2950 Magic Damage. Effective MR = (60 * 0.6) - 40 = -4. (Treated as 0 by pen limits). Mitigated Dmg = 2950. Target HP = 2000. Overkill = 950. The combo guarantees absolute lethal.

Case Study B: Bruiser Mixed Output

Scenario: Jax using Q, E, W, and one Auto. 150 Bonus AD, 50 AP. Target: 1800 HP, 100 Armor, 80 MR. Physical Burst: 450 Base + 180% AD. Magic Burst: 300 Base + 60% AP. No Pen.

Outcome: Raw Physical = 450 + 270 = 720. Mitigated Physical = 720 / (100/200) = 360. Raw Magic = 300 + 30 = 330. Mitigated Magic = 330 / (100/180) = 183. Total Burst = 543. Result: Heavy damage but far from lethal (70% HP remaining).

Summary

The League of Legends Burst Damage Calculator is the definitive truth-teller for 'One-Shot' potential. By consolidating your physical, magical, and true damage components across your entire combo, you can conclusively prove whether that flash-engage is a match-winning highlight or an embarrassing int. Do the math, know your limits, and secure the kill.