FEH Calculator
Professional Damage & Combat Outcome Simulator for Fire Emblem Heroes
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Damage Profile Visualization
Comparison of Attacker’s Effective Attack vs Defender’s Mitigation
What is a FEH Calculator?
A feh calculator is an essential tool for players of the mobile strategy RPG, Fire Emblem Heroes. This utility allows tacticians to pre-calculate the outcome of combat between two units, accounting for a vast array of variables including base stats, weapon effects, and the iconic Weapon Triangle system. Using a feh calculator ensures that your units survive enemy phase encounters and successfully secure KOs during player phase.
Who should use it? Competitive Arena players, Aether Raids enthusiasts, and even casual players tackling high-difficulty Hero Battle maps benefit from the precision of a feh calculator. A common misconception is that combat is purely random; however, FEH uses deterministic math, meaning with the right feh calculator, you can predict every battle with 100% accuracy.
FEH Calculator Formula and Mathematical Explanation
The core logic of the feh calculator follows a specific order of operations established by Intelligent Systems. The math involves multiplication, flooring (rounding down), and subtraction.
The Core Formula:
Final Damage = Floor(Floor(Atk * Effectiveness) * TriangleMultiplier) – Def/Res + SpecialDamage
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Atk | Attacker’s Total Attack | Points | 30 – 99 |
| Def/Res | Defender’s Mitigation | Points | 10 – 70 |
| WTA | Weapon Triangle Advantage | Multiplier | 0.8x – 1.2x |
| Effectiveness | Slayer/Effective Weapon | Multiplier | 1.0x or 1.5x |
Practical Examples (Real-World Use Cases)
Example 1: Legendary Sigurd vs. Bulk Green Unit
Suppose Sigurd has 60 Atk and attacks a green axe unit with 35 Def. Since Sigurd (Red) has the advantage in this feh calculator scenario:
- Base Atk: 60
- WTA (1.2x): 60 * 1.2 = 72
- Damage: 72 – 35 = 37 Damage.
Example 2: Bow Archer vs. Flier
An Archer with 50 Atk initiates on a Flier with 20 Def. The feh calculator applies effectiveness:
- Atk with Effectiveness (1.5x): 50 * 1.5 = 75
- Damage: 75 – 20 = 55 Damage.
How to Use This FEH Calculator
- Enter Attacker Atk: Include all “during combat” buffs (Spurs, Drives, Blows).
- Enter Defender Def/Res: Use Def for physical weapons (Swords, Lances, Axes, Bows, Daggers, Beasts) and Res for magical (Tomes, Staves, Breaths).
- Select WTA: Choose “Advantage” if your color beats theirs.
- Toggle Effectiveness: If your weapon is “Effective against” the target’s movement type.
- Add Special Damage: If a Special (like Glimmer or Luna) is proccing, enter the bonus flat damage calculated by the feh calculator.
Key Factors That Affect FEH Calculator Results
- Weapon Refines: Many refines add +5 or more to Atk during combat, which must be manually added to the feh calculator inputs.
- Merges and Dragonflowers: High-investment units gain significant stat boosts that alter the math of a feh calculator.
- Damage Reduction (DR): Modern units often have “reduce damage by X%” skills. While this feh calculator provides base damage, you must subtract the percentage after.
- True Damage: Skills like “Bushido” or “Flashing Blade 4” add flat damage that ignores Def/Res.
- Blessings: In Aether Raids or Arena, Mythic/Legendary blessings can boost Atk or Def by 2-5 points.
- Support Ranks: Ally Support and Summoner Support provide invisible stat buffs crucial for feh calculator precision.
Frequently Asked Questions (FAQ)
Why is my damage 0 in the feh calculator?
If the Defender’s Def/Res is higher than your adjusted Attack, the game defaults to 0 damage unless you have “True Damage” skills.
How does Weapon Triangle Adept affect the feh calculator?
TA3 increases the WTA multiplier to 1.4x (Advantage) or 0.6x (Disadvantage) instead of the standard 1.2/0.8.
Does the feh calculator account for Brave weapons?
This calculator shows damage per hit. For Brave weapons, you simply double the final result if the unit attacks twice.
What is “Adaptive Damage”?
Some weapons (like Dragons) target the lower of Def or Res. Ensure you input the lower value into the feh calculator.
How do I calculate Moonbow damage?
Take 30% of the enemy’s Def/Res and add it to the “Special Damage” field in our feh calculator.
What about in-combat buffs vs visible buffs?
Both should be summed up. If a unit has 50 base Atk, a +6 visible buff, and Death Blow 4 (+8), enter 64 into the feh calculator.
Does the feh calculator work for Aether Raids?
Yes, but you must account for structure buffs and Mythic stat bonuses manually.
Is rounding important in FEH math?
Yes, FEH always rounds down (floors) at every intermediate step of the multiplication.
Related Tools and Internal Resources
- Arena Score Calculator – Estimate your weekly ranking points.
- Summoning Simulator – Test your luck before spending Orbs.
- Unit List & BST Table – Find base stats for all heroes.
- Skill Inheritance Guide – Optimize your builds for maximum damage.
- BST Checker – See which units score highest in competitive modes.
- Blessing & Season Guide – Maximize your stats during specific seasons.