FE Heroes Damage Calculator

Accurately predict combat outcomes in Fire Emblem Heroes

FE Heroes Damage Calculator

Input your unit’s and enemy’s stats and skills to determine the damage dealt in combat. This FE Heroes Damage Calculator helps you optimize builds and plan strategies.

Defender’s Stats

Weapon Triangle Advantage (WTA) Chart

Attacker Type	Defender Type	Effect on Attacker’s Atk
Red (Sword, Red Tome)	Green (Axe, Green Tome)	+20% (Advantage)
Red (Sword, Red Tome)	Blue (Lance, Blue Tome)	-20% (Disadvantage)
Blue (Lance, Blue Tome)	Red (Sword, Red Tome)	+20% (Advantage)
Blue (Lance, Blue Tome)	Green (Axe, Green Tome)	-20% (Disadvantage)
Green (Axe, Green Tome)	Blue (Lance, Blue Tome)	+20% (Advantage)
Green (Axe, Green Tome)	Red (Sword, Red Tome)	-20% (Disadvantage)
Colorless (Bow, Dagger, Staff)	Any Color	Neutral (1.0x)
Any Color	Colorless (Bow, Dagger, Staff)	Neutral (1.0x)

What is an FE Heroes Damage Calculator?

An FE Heroes Damage Calculator is an essential online tool designed for players of the popular mobile game, Fire Emblem Heroes (FEH). This calculator allows users to input various combat parameters for both their attacking unit and an enemy unit to predict the exact amount of damage that will be dealt in a single combat interaction. By simulating battles outside of the game, players can make informed decisions about unit builds, skill inheritance, team composition, and strategic positioning.

This tool is invaluable for anyone looking to optimize their gameplay, whether they are competitive Arena players, Aether Raids strategists, or simply want to understand the intricate damage mechanics of the game. It helps in theorycrafting new builds, testing unit matchups, and understanding the impact of buffs, debuffs, and special skills without spending in-game stamina or resources.

Who Should Use an FE Heroes Damage Calculator?

• Competitive Players: Essential for Arena, Aether Raids, and Summoner Duels to ensure optimal damage output and survivability.
• Theorycrafters: For experimenting with new unit builds, skill combinations, and weapon refines.
• New Players: To grasp the fundamental damage mechanics and how different stats and skills interact.
• Content Creators: For demonstrating unit potential and explaining combat scenarios.
• Casual Players: To simply satisfy curiosity about specific matchups or to plan for challenging in-game content.

Common Misconceptions about FE Heroes Damage Calculation

Many players often misunderstand certain aspects of damage calculation in FEH:

• Flat Damage vs. Percentage Damage: Not all damage modifiers are applied at the same stage. Flat damage (like from Wo Dao or Wrath) is usually added at the very end, while percentage-based damage reduction (like from Spurn or Close Call) is applied to the calculated damage.
• Visible vs. In-Combat Stats: Visible stats (blue/red numbers on the unit screen) are affected by buffs/debuffs from skills like Hone Atk or Panic. In-combat stats are temporary boosts/penalties that only apply during combat (e.g., from Death Blow, Steady Stance) and are not reflected on the unit screen. The FE Heroes Damage Calculator accounts for both.
• Weapon Triangle Advantage (WTA): WTA is a multiplier applied to the attacker’s Atk stat, not directly to the final damage. It’s a crucial factor, but its exact application point matters.
• Special Skill Timing: Special skills like Glimmer, Luna, and Astra modify damage at different stages of the calculation, leading to varied results. Ruptured Sky, for instance, has a unique interaction with Dragon/Beast foes.

FE Heroes Damage Calculator Formula and Mathematical Explanation

The core damage calculation in Fire Emblem Heroes is a multi-step process. Our FE Heroes Damage Calculator simplifies this by taking your total effective stats, but understanding the underlying formula is key to mastering the game.

Step-by-Step Derivation of Damage:

1. Determine Effective Attacker Attack (EAtk):
   
   EAtk = (Base Atk + Weapon Might + Atk from Skills + Visible Atk Buffs)
   
   This is the total attack value your unit brings into combat before any weapon triangle or special skill modifications.
2. Determine Effective Defender Defense/Resistance (EDef/Res):
   
   EDef/Res = (Base Def/Res + Def/Res from Skills - Visible Def/Res Debuffs)
   
   This is the total defensive value the enemy unit presents, considering their own skills and any debuffs applied to them.
3. Apply Weapon Triangle Advantage (WTA):
   
   Based on the attacker’s and defender’s weapon types, a multiplier is applied to the Attacker’s Effective Attack.
   
   WTA Multiplier = 1.2 for Advantage (e.g., Red vs. Green)
   
   WTA Multiplier = 0.8 for Disadvantage (e.g., Green vs. Red)
   
   WTA Multiplier = 1.0 for Neutral (e.g., Colorless vs. Any, or same color)
   
   Modified EAtk = EAtk * WTA Multiplier
4. Calculate Base Damage Before Reductions:
   
   Base Damage = Modified EAtk - EDef/Res
   
   If Base Damage < 0, it is typically set to 0. In FEH, if damage is > 0, the minimum is 5.
5. Apply Special Skill Modifiers:
   • Glimmer: Base Damage = Base Damage * 1.5
   • Luna: Base Damage = Modified EAtk - (EDef/Res * 0.5) (Luna effectively halves the defender's defense/resistance for the calculation)
   • Astra: Base Damage = Base Damage * 2.5
   • Ruptured Sky: Base Damage = (Modified EAtk * 1.2) - EDef/Res (if defender is not Dragon/Beast) OR Base Damage = (Modified EAtk * 1.4) - EDef/Res (if defender is Dragon/Beast). This is applied to the attacker's Atk before subtraction.
6. Apply Damage Reduction Skills:
   
   If the defender has damage reduction (e.g., Spurn, Close Call, Shield Pulse), this is applied as a percentage.
   
   Damage After Reduction = Base Damage * (1 - Damage Reduction Percentage / 100)
7. Add Bonus True Damage:
   
   Finally, any flat "true damage" (e.g., from Wo Dao, Wrath, Grandscratcher) is added.
   
   Final Damage = Damage After Reduction + Bonus True Damage

Variable Explanations and Typical Ranges:

Key Variables in FE Heroes Damage Calculation

Variable	Meaning	Unit	Typical Range
Attacker's Total Attack	Combined Atk stat, weapon Mt, buffs, and in-combat Atk skills.	Points	40 - 90+
Attacker's Weapon Type	Color of the attacker's weapon (Red, Blue, Green, Colorless).	Type	Red, Blue, Green, Colorless
Attacker's Special Skill	Special skill that modifies damage (e.g., Glimmer, Luna).	Skill Name	None, Glimmer, Luna, Astra, Ruptured Sky
Bonus True Damage	Flat damage added after all other calculations.	Points	0 - 10+
Defender's Total Def/Res	Combined Def/Res stat, in-combat Def/Res skills, and debuffs.	Points	15 - 60+
Defender's Weapon Type	Color of the defender's weapon.	Type	Red, Blue, Green, Colorless
Damage Reduction %	Percentage of damage reduced by skills (e.g., Spurn, Close Call).	Percentage	0% - 99%
Is Defender Dragon/Beast?	Boolean flag for specific special skill interactions.	Yes/No	True/False

Practical Examples (Real-World Use Cases)

Let's walk through a couple of examples using the FE Heroes Damage Calculator to illustrate its utility.

Example 1: Standard Combat with Weapon Triangle Advantage

Imagine your fully built Legendary Marth (Red Sword) attacking a Legendary Edelgard (Green Axe).

• Attacker (L!Marth):
  • Total Attack: 75 (Base 45 + Falchion 16 + Atk/Spd Ideal 4: +7 + Atk/Spd Oath 4: +7)
  • Weapon Type: Red
  • Special Skill: None
  • Bonus True Damage: 0
• Defender (L!Edelgard):
  • Total Defense: 48 (Base 40 + A/D Ideal 4: +7 + Atk/Def Menace: -7 debuff on Marth, but we're using total Def/Res here, so let's assume her effective Def is 48)
  • Weapon Type: Green
  • Damage Reduction %: 0%
  • Is Defender Dragon/Beast?: No

Calculator Output:

• Effective Attacker Atk: 75
• Effective Defender Def/Res: 48
• Weapon Triangle Multiplier: 1.2x (Red vs. Green Advantage)
• Damage Before Reductions: (75 * 1.2) - 48 = 90 - 48 = 42
• Final Damage Dealt: 42

Interpretation: Marth deals 42 damage, which is a solid hit, likely enough to one-shot or severely wound Edelgard, demonstrating the power of weapon triangle advantage and high attack stats. This helps confirm if Marth is a good counter for Edelgard.

Example 2: High Damage Reduction and Special Skill Interaction

Consider a speedy Legendary Chrom (Blue Bow) attacking a highly invested Brave Dimitri (Blue Lance) with damage reduction.

• Attacker (L!Chrom):
  • Total Attack: 70 (Base 40 + To Change Fate 14 + Atk/Spd Push 4: +7 + Atk/Spd Menace: +6)
  • Weapon Type: Blue
  • Special Skill: Luna
  • Bonus True Damage: 0
• Defender (B!Dimitri):
  • Total Defense: 55 (Base 45 + Atk/Def Unity: +7 + Def/Res Menace: -7 on Chrom, but we're using total Def/Res here, so let's assume his effective Def is 55)
  • Weapon Type: Blue
  • Damage Reduction %: 40% (from Blue Lion Rule)
  • Is Defender Dragon/Beast?: No

Calculator Output:

• Effective Attacker Atk: 70
• Effective Defender Def/Res: 55
• Weapon Triangle Multiplier: 1.0x (Blue vs. Blue Neutral)
• Damage Before Reductions (with Luna): (70 * 1.0) - (55 * 0.5) = 70 - 27.5 = 42.5 (rounded to 42 or 43 in game)
• Damage After Reductions: 42.5 * (1 - 40/100) = 42.5 * 0.6 = 25.5
• Final Damage Dealt: 25 (FEH rounds down)

Interpretation: Even with Luna, Chrom only deals 25 damage due to Dimitri's high defense and significant damage reduction. This shows how powerful damage reduction skills are and why a FE Heroes Damage Calculator is crucial for understanding seemingly unfavorable matchups. It highlights that even strong attackers can struggle against specific defensive builds.

How to Use This FE Heroes Damage Calculator

Our FE Heroes Damage Calculator is designed for ease of use, providing quick and accurate combat predictions. Follow these steps to get the most out of it:

1. Input Attacker's Total Attack: Enter the combined Attack stat of your attacking unit. This should include their base Attack, weapon Might, any visible Attack buffs (e.g., +6 from Hone Atk), and any in-combat Attack boosts from skills (e.g., Death Blow 4 adds +8 Atk).
2. Select Attacker's Weapon Type: Choose the color of your attacker's weapon (Red, Blue, Green, or Colorless). This is crucial for Weapon Triangle Advantage.
3. Select Attacker's Special Skill: If your attacker has a damage-modifying special skill (like Glimmer, Luna, Astra, or Ruptured Sky), select it from the dropdown.
4. Enter Bonus True Damage: If your attacker has skills that add flat damage (e.g., Wo Dao, Wrath), input that value here.
5. Input Defender's Total Defense/Resistance: Enter the combined Defense or Resistance stat of the enemy unit. Use Defense for physical attacks (swords, lances, axes, bows, daggers) and Resistance for magical attacks (tomes, staves, dragon breaths). This should include their base Def/Res, any in-combat Def/Res boosts (e.g., Steady Stance 4 adds +8 Def), and any visible Def/Res debuffs (e.g., -7 from Threaten Def).
6. Select Defender's Weapon Type: Choose the color of the defender's weapon. This, along with the attacker's type, determines Weapon Triangle Advantage.
7. Enter Damage Reduction %: If the defender has skills that reduce incoming damage by a percentage (e.g., Spurn, Close Call, Shield Pulse), enter that percentage here (e.g., 40 for 40%).
8. Check "Is Defender Dragon/Beast?": Tick this box if the enemy unit is a Dragon or Beast, as some special skills (like Ruptured Sky) have enhanced effects against them.
9. Read Results: The "Final Damage Dealt" will update in real-time. Below it, you'll see intermediate values like Effective Attacker Atk, Effective Defender Def/Res, Weapon Triangle Multiplier, and Damage Before Reductions, providing a detailed breakdown.
10. Use Buttons: Click "Reset" to clear all inputs to default values. Click "Copy Results" to copy the main and intermediate results to your clipboard for easy sharing or record-keeping.

How to Read Results and Decision-Making Guidance

The primary result, "Final Damage Dealt," tells you exactly how much damage your unit will inflict. Intermediate values help you understand *why* that damage is dealt. For instance, a low "Damage Before Reductions" might indicate the defender has very high effective Def/Res, while a large difference between "Damage Before Reductions" and "Final Damage Dealt" points to strong damage reduction skills.

Use this information to:

• Optimize Builds: If your damage is too low, consider skills that boost Atk, grant true damage, or bypass defense (like Luna).
• Identify Counters: Quickly determine if your unit can effectively defeat a specific enemy, especially in competitive modes.
• Plan Engagements: Understand when to use a special skill, or if you need to apply buffs/debuffs before initiating combat.
• Evaluate New Units: Test the combat potential of newly summoned units or potential skill inheritance candidates.

Key Factors That Affect FE Heroes Damage Results

Understanding the various elements that influence damage output is crucial for mastering Fire Emblem Heroes. The FE Heroes Damage Calculator takes these into account, but knowing their individual impact helps in strategic planning.

1. Attack (Atk) and Defense/Resistance (Def/Res) Stats: These are the most fundamental stats. Higher Attacker Atk leads to more damage, while higher Defender Def/Res reduces incoming damage. This includes base stats, IVs, merges, and Dragonflowers.
2. Weapon Might (Mt): Every weapon has a Might value that directly adds to the unit's Attack stat. Legendary and Refined weapons often have higher Might, significantly boosting damage.
3. Weapon Triangle Advantage (WTA): The rock-paper-scissors system (Red > Green > Blue > Red) provides a 20% Attack boost for advantage and a 20% penalty for disadvantage. This can swing combat outcomes dramatically and is a core mechanic the FE Heroes Damage Calculator models.
4. In-Combat Buffs and Debuffs: Skills like Death Blow, Swift Sparrow, Steady Stance, or Kestrel Stance provide temporary stat boosts during combat. Debuffs like Threaten Atk/Def/Res or Chill skills reduce enemy stats. These are critical for fine-tuning damage.
5. Visible Buffs and Debuffs: These are the blue (buff) or red (debuff) numbers shown on a unit's stat screen. Skills like Hone Atk, Rally Atk, or Panic apply these. They affect the unit's base stats before in-combat calculations.
6. Special Skills: Specials like Glimmer, Luna, Astra, and Ruptured Sky have unique damage-modifying effects. Some multiply final damage, others reduce the defender's effective defense, and some have conditional bonuses. Choosing the right special is vital.
7. Damage Reduction Skills: Many modern units and skills (e.g., Spurn, Close Call, Shield Pulse, Guard Bearing) reduce incoming damage by a percentage. These are incredibly powerful for survivability and can drastically alter the final damage dealt by an attacker.
8. True Damage: Certain skills (e.g., Wo Dao, Wrath, Grandscratcher) add a flat amount of damage after all other calculations. This "true damage" bypasses defense and damage reduction, making it very potent against tanky units.
9. Terrain Effects: Tiles like forests or defensive tiles can grant temporary Def/Res bonuses to units standing on them, impacting damage. While not directly in this calculator, it's an important in-game factor.

Frequently Asked Questions (FAQ) about the FE Heroes Damage Calculator

Q1: What is the minimum damage dealt in FE Heroes?

A1: In Fire Emblem Heroes, if the calculated damage is greater than 0, the minimum damage dealt is always 5. If the calculated damage is 0 or less, no damage is dealt.

Q2: How do visible buffs/debuffs differ from in-combat buffs/debuffs?

A2: Visible buffs/debuffs (blue/red numbers on the stat screen) modify a unit's base stats before combat. In-combat buffs/debuffs (from skills like Death Blow, Steady Stance) only apply during the combat animation and are not reflected on the unit's stat screen. Our FE Heroes Damage Calculator expects you to combine these into the "Total Attack" and "Total Def/Res" inputs.

Q3: Does the FE Heroes Damage Calculator account for all skills?

A3: This FE Heroes Damage Calculator covers the most common and impactful damage-modifying mechanics: total Atk/Def/Res, Weapon Triangle, Special Skills (Glimmer, Luna, Astra, Ruptured Sky), Damage Reduction, and Bonus True Damage. While FEH has hundreds of unique skills, many can be distilled into these core stat changes or damage modifiers. For highly specific skill interactions (e.g., "effective against" weapons, specific unit-locked skills), you might need to manually adjust your "Total Attack" or "Total Def/Res" inputs to reflect their effects.

Q4: How does Ruptured Sky work with the FE Heroes Damage Calculator?

A4: Ruptured Sky adds 20% of the attacker's Attack as damage. If the foe is a Dragon or Beast, it adds 40% of the attacker's Attack instead. Our calculator applies this bonus directly to the attacker's effective attack before the subtraction from defense/resistance, as per the game's mechanics.

Q5: Can I use this calculator for Aether Raids or Arena?

A5: Absolutely! This FE Heroes Damage Calculator is perfect for planning your Aether Raids offense/defense teams and optimizing Arena scoring. By testing matchups, you can ensure your units can secure kills or survive crucial engagements against common threats.

Q6: What if a skill ignores a percentage of the foe's Def/Res (e.g., Luna)?

A6: Skills like Luna effectively reduce the defender's Def/Res by a percentage (e.g., 50% for Luna) for the damage calculation. Our calculator has a specific option for Luna under "Attacker's Special Skill" to handle this correctly.

Q7: Why is my calculated damage different from in-game?

A7: Discrepancies can arise from several factors:

• Incorrect Input: Double-check that all "Total Attack" and "Total Def/Res" values accurately reflect all buffs, debuffs, and in-combat skill effects.
• Missing Specific Skills: Some very niche skills might not be explicitly covered. Try to translate their effects into the existing inputs (e.g., a skill that grants +5 Atk can be added to "Attacker's Total Attack").
• Rounding: FEH often rounds down intermediate values. Our calculator aims for accuracy but minor rounding differences can occur.
• Minimum Damage: Remember the in-game minimum of 5 damage if the calculated damage is greater than 0.

Q8: How do I determine "Total Attack" or "Total Def/Res" for my units?

A8: To get these values, you need to sum up:

• Your unit's base stat (from the unit screen, including merges/Dragonflowers/IVs).
• Weapon Might.
• Visible buffs (blue numbers) or debuffs (red numbers).
• In-combat stat boosts from A, B, C, S skills (e.g., Death Blow 4 gives +8 Atk, Steady Stance 4 gives +8 Def).

For example, if a unit has 50 Atk, a 16 Mt weapon, +6 visible Atk buff, and Death Blow 4 (+8 Atk), their "Total Attack" would be 50 + 16 + 6 + 8 = 80.

Related Tools and Internal Resources

Enhance your Fire Emblem Heroes experience with these other valuable tools and guides:

• FEH Unit Builder: Create and share custom unit builds, experiment with skills, and plan your ideal heroes.
• FEH IV Checker: Quickly determine your unit's Individual Values (IVs) to understand their stat strengths and weaknesses.
• FEH Summon Simulator: Practice summoning on various banners without spending Orbs, helping you manage expectations and plan your pulls.
• FEH Arena Calculator: Optimize your Arena team's score to climb the ranks and earn valuable rewards.
• FEH Skill Inheritance Guide: Learn the best practices and strategies for inheriting skills to maximize your units' potential.
• FEH Tier List: See how various heroes rank in the current meta, helping you decide which units to invest in.