FEH Damage Calculator

A FEH damage calculator is an essential tool for players of Fire Emblem Heroes, a popular tactical role-playing mobile game. It allows players to accurately predict the outcome of combat encounters between two units by inputting their respective stats, equipped skills, and various combat conditions. This tool helps you understand how much damage your unit will deal to an enemy, or vice-versa, taking into account the intricate mechanics of the game.

Who Should Use a FEH Damage Calculator?

Anyone looking to deepen their understanding of Fire Emblem Heroes combat will benefit. This includes:

• Competitive Players: For optimizing Arena, Aether Raids, or Summoner Duels teams.
• Team Builders: To test synergy between units and skill sets.
• Theorycrafters: To explore hypothetical builds and their effectiveness.
• Casual Players: To understand why certain matchups play out the way they do and improve strategy.

Common Misunderstandings (Including Unit Confusion)

In FEH, damage and stats are typically represented by raw numerical values, which are essentially "unitless" in the traditional sense. However, common misunderstandings include:

• Stat Caps: While base stats have visible caps (e.g., 99), in-combat buffs can push effective stats much higher.
• Damage Reduction Stacking: Multiple damage reduction sources often do not simply add up (e.g., 40% + 40% does not mean 80% total reduction). They usually apply multiplicatively or by taking the highest value. This calculator simplifies by taking a single percentage.
• Special Skill Triggers: Misjudging when a Special will activate can drastically alter combat outcomes. This calculator assumes the Special is ready.
• Follow-up Attack Mechanics: The precise speed difference (usually 5 points) required for a guaranteed follow-up or prevention can be tricky, especially with skills that modify speed in combat.
• "True Damage": Damage that bypasses defense/resistance is sometimes confused with flat damage bonuses that are still subject to damage reduction. This calculator focuses on standard damage.

Our FEH damage calculator aims to clarify these interactions, providing transparent results.

The core of the FEH damage calculator relies on a simplified version of the game's combat formula. While Fire Emblem Heroes has many complex interactions, the fundamental damage calculation can be broken down as follows:

Raw Damage = MAX(0, Attacker's Effective Attack - Defender's Effective Defense/Resistance)

This raw damage is then modified by special skills, damage reduction effects, and follow-up attacks.

Variables Explanation:

Here's a breakdown of the variables used in this FEH damage calculator and their meaning:

Key Variables in FEH Damage Calculation

Variable	Meaning	Unit	Typical Range
HP	Health Points	Stat Points	30 - 70
Attack (Atk)	Unit's offensive power	Stat Points	30 - 60
Speed (Spd)	Determines follow-up attacks	Stat Points	20 - 50
Defense (Def)	Reduces physical damage	Stat Points	15 - 50
Resistance (Res)	Reduces magical damage	Stat Points	10 - 50
Weapon Might (Mt)	Attack value provided by the weapon	Stat Points	0 - 20
Atk/Def/Res Buffs	In-combat stat bonuses or penalties	Stat Points	-7 to +7
Special Skill Multiplier/Scaling	Factor by which a Special skill modifies damage	Multiplier / Percentage	x1.2, x1.5, +50% Def, etc.
Damage Reduction	Percentage of incoming damage negated by skills	Percentage	0% - 90%

All calculations are rounded down (truncated) at various steps, mimicking FEH's in-game mechanics.

Let's walk through a couple of examples to see the FEH damage calculator in action.

Example 1: Standard Physical Encounter

Imagine your Player Unit (a Sword Infantry) is attacking a Foe Unit (an Axe Armored).

• Player Unit Inputs:
  • Atk: 60, Spd: 40, Def: 35, Res: 25
  • Weapon Might: 16
  • Atk Buffs: +6
  • Special Skill: None
• Foe Unit Inputs:
  • Def: 45, Res: 20, Spd: 25
  • Def/Res Buffs: +6
  • Damage Reduction: 0%
  • Guard Effect: No
• Combat Conditions:
  • Weapon Type: Physical
  • Combat Initiates: Player Unit
  • Weapon Triangle: Advantage (Sword vs. Axe)
  • Effective Damage: No

Result:

The calculator would show:

• Effective Attack of Player Unit: (60 + 16 + 6) * 1.2 = 98.4 -> 98
• Effective Defense of Foe Unit: 45 + 6 = 51
• Damage per Hit: MAX(0, 98 - 51) = 47
• Follow-up Attack: Yes (PU Spd 40 - FU Spd 25 = 15 > 5)
• Total Damage Dealt: 94 (47 x 2 hits)

Example 2: Magical Encounter with Damage Reduction and Special

Now, your Player Unit (a Red Mage) attacks a Foe Unit (a Blue Dragon).

• Player Unit Inputs:
  • Atk: 55, Spd: 38, Def: 20, Res: 30
  • Weapon Might: 14
  • Atk Buffs: 0
  • Special Skill: Glimmer (Damage x1.2)
• Foe Unit Inputs:
  • Def: 30, Res: 40, Spd: 30
  • Def/Res Buffs: 0
  • Damage Reduction: 40% (from a skill like Spurn)
  • Guard Effect: No
• Combat Conditions:
  • Weapon Type: Magical
  • Combat Initiates: Player Unit
  • Weapon Triangle: Neutral
  • Effective Damage: Yes (Red Mage vs. Dragon)

Result:

The calculator would show:

• Effective Attack of Player Unit: (55 + 14) * 1.5 (effective) = 103.5 -> 103
• Effective Resistance of Foe Unit: 40
• Raw Damage per Hit: MAX(0, 103 - 40) = 63
• Damage after Foe's Reduction: 63 * (1 - 0.40) = 37.8 -> 37
• Damage after Glimmer: 37 * 1.2 = 44.4 -> 44
• Follow-up Attack: Yes (PU Spd 38 - FU Spd 30 = 8 > 5)
• Total Damage Dealt: 88 (44 x 2 hits)

These examples highlight how different factors combine to determine the final damage output, making the FEH damage calculator invaluable for strategic planning.

Using this FEH damage calculator is straightforward, designed to give you quick and accurate results. Follow these steps:

1. Input Player Unit (Attacker) Stats: Enter the HP, Atk, Spd, Def, Res, Weapon Might, and any in-combat Atk buffs or debuffs for your unit. Select the Special Skill your unit will activate.
2. Input Foe Unit (Defender) Stats: Provide the Foe's HP, Atk, Spd, Def, Res, any in-combat Def/Res buffs or debuffs, their Damage Reduction percentage, and if they have a Guard effect.
3. Set Combat Conditions:
   • Weapon Type: Choose 'Physical' if your unit deals physical damage (swords, lances, axes, bows, daggers, beast units) or 'Magical' (tomes, staves, dragonstones). This determines if the Foe's Defense or Resistance is used.
   • Combat Initiator: Select whether your Player Unit or the Foe Unit initiates combat. This is crucial for speed-based follow-up attacks.
   • Weapon Triangle: Indicate if your unit has a weapon advantage (+20% Atk), disadvantage (-20% Atk), or is neutral against the Foe. (See FEH Weapon Triangle section below for more details.)
   • Effective Damage: Check this box if your unit has a weapon that is "effective against" the Foe's movement type or weapon type (e.g., Bows vs. Fliers, Dragonstones vs. Dragons). This grants a +50% Atk bonus.
4. Calculate Damage: Click the "Calculate Damage" button. The results will instantly update.
5. Interpret Results:
   • Total Damage Dealt: This is the final, total damage your unit will inflict on the Foe, including any follow-up attacks. Compare this to the Foe's HP to see if they are defeated.
   • Intermediate Results: Review values like "Damage per Hit," "Effective Attack," and "Follow-up Attack Status" to understand the calculation steps.
6. Reset to Defaults: Use the "Reset to Defaults" button to clear all inputs and return to the initial suggested values.
7. Copy Results: The "Copy Results" button will save all calculated values and input assumptions to your clipboard for easy sharing or record-keeping.

Remember that all values are "unitless" raw stat points or percentages, as is standard in Fire Emblem Heroes.

Understanding the various elements that influence damage is crucial for mastering Fire Emblem Heroes combat. Our FEH damage calculator accounts for many of these:

1. Base Stats (Atk, Def, Res): The fundamental building blocks of damage. Higher Atk means more damage, while higher Def/Res means less incoming damage. These values are the starting point for all calculations.
2. Weapon Might (Mt): A direct addition to a unit's Atk stat, often overlooked but very significant. Stronger weapons inherently deal more damage.
3. Weapon Triangle: The iconic rock-paper-scissors mechanic (Red > Green > Blue > Red; Colorless is neutral). Having weapon advantage grants a 20% Atk boost, while disadvantage incurs a 20% Atk penalty.
4. Effective Damage: Certain weapons deal "effective damage" against specific unit types (e.g., bows against fliers, dragon-slaying weapons against dragons). This provides a massive 50% Atk boost, often turning losing matchups into wins.
5. Special Skills: These powerful abilities can drastically alter damage. Some, like Glimmer/Astra, multiply final damage, while others, like Bonfire/Ignis, add bonus damage based on Def/Res. Timing their activation is key.
6. In-Combat Buffs and Debuffs: Skills like Rally, Hone, or effects from weapons (e.g., Blade Tomes) can apply temporary stat increases (buffs) or decreases (debuffs) to Atk, Def, Res, and Spd, directly impacting damage and survivability.
7. Damage Reduction Skills: Modern FEH features many skills (e.g., Spurn, Close Call, Guard Bearing) that reduce incoming damage by a percentage. These can make units incredibly tanky.
8. Follow-up Attacks (Speed vs. Speed): A unit with at least 5 more Speed than their opponent will make a guaranteed follow-up attack, effectively doubling their damage output (or taking double damage if the foe initiates and has speed advantage). Skills like "Guard" can prevent these. This is a critical factor for total damage output and survivability.

Each of these factors interacts in complex ways, making a reliable FEH damage calculator indispensable for precise combat analysis.

Q1: How accurate is this FEH damage calculator?

A: This calculator is designed to be highly accurate for standard combat scenarios by reflecting the core mechanics of Fire Emblem Heroes, including stat calculations, weapon triangle, effective damage, specials, and damage reduction. It uses truncation for intermediate values, just like the game. However, extremely niche skills or complex interactions (e.g., multiple layers of damage reduction, specific true damage effects) are simplified or not included to maintain usability. Always cross-reference with in-game testing for the most obscure scenarios.

Q2: Why are there no specific units like "feet" or "pounds" for stats?

A: In Fire Emblem Heroes, all character stats (HP, Atk, Spd, Def, Res) and damage values are purely numerical points. They don't correspond to real-world units of measurement like length or weight. They are "unitless" in that sense, representing abstract power levels within the game's system. Our calculator follows this convention, clearly labeling each value by its in-game stat name.

Q3: What does "Effective Attack" mean?

A: Effective Attack is the total Attack value your Player Unit brings into the damage formula after considering their base Atk, weapon Might, Atk buffs/debuffs, weapon triangle advantage/disadvantage, and effective damage bonuses. It's the raw offensive power before clashing with the Foe's defenses.

Q4: How does the "Foe's Damage Reduction" work?

A: This input accounts for skills like Spurn, Close Call, Guard Bearing, or certain weapon effects that reduce incoming damage by a percentage. If a Foe has 40% damage reduction, for example, they will take 40% less damage from each hit. This calculator applies a single percentage reduction to the damage after it's been calculated against the Foe's Def/Res.

Q5: What if my unit has multiple damage reduction skills?

A: This calculator simplifies by allowing only one "Foe's Damage Reduction (%)" input. In FEH, multiple damage reduction sources often stack multiplicatively or use the highest value. For precise multi-DR calculations, you might need a more advanced FEH combat mechanics tool, but for most common scenarios, inputting the primary DR percentage will give a very good estimate.

Q6: Does this calculator account for "True Damage" or "True Damage Reduction"?

A: This calculator focuses on standard damage calculation and percentage-based damage reduction. "True Damage" (damage that ignores defense/resistance) and "True Damage Reduction" (skills that reduce damage before Def/Res calculation) are advanced mechanics not explicitly modeled here to keep the calculator streamlined. For these, manual calculation or more specialized tools might be needed.

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

A: Double-check all your inputs against the in-game values. Common discrepancies arise from:

• Overlooking minor buffs/debuffs (e.g., from adjacent allies, terrain).
• Incorrectly accounting for in-combat speed changes affecting follow-ups.
• Misunderstanding how specific skills interact (e.g., some skills reduce foe's damage reduction, which isn't modeled here).
• Special skill cooldown not being ready in-game.

Ensure you are using the unit's *in-combat* stats, not just their base stats.

Q8: Can I use this for planning Aether Raids or Arena teams?

A: Absolutely! This FEH damage calculator is an excellent starting point for FEH Arena calculator and Aether Raids planning. By simulating various matchups, you can identify strong counters, optimize FEH skill effects, and refine your team composition without wasting stamina or resources in-game. It helps in understanding crucial thresholds for one-shotting enemies or surviving key attacks.

To further enhance your Fire Emblem Heroes strategy, explore these related resources:

• FEH Stats Explained: A detailed guide to understanding every stat in Fire Emblem Heroes and how they impact combat.
• FEH Combat Mechanics: Dive deeper into the intricate rules that govern combat interactions, including advanced skill priority.
• FEH Unit Builder: Plan your ideal unit builds, including merges, flowers, and skill sets, then bring those stats back to this damage calculator.
• FEH Skill Effects Guide: An extensive database and explanation of various A, B, C, and Sacred Seal skills and their impact.
• FEH Arena Calculator: Optimize your team for higher scores in the Arena mode.
• FEH Weapon Triangle Explained: A comprehensive look at the weapon triangle and its strategic implications.