iv calculator fire emblem heroes

What this FEH IV calculator does

In Fire Emblem Heroes, each unit can have small stat variations commonly called IVs, now usually shown as Asset and Flaw. This calculator helps you compare known neutral stats against your unit's current level 40 stats and quickly identify likely stat strengths and weaknesses.

Instead of manually checking every stat line, you can plug in the numbers and get a readable summary with likely Asset/Flaw outcomes, possible superboons/superbanes, and a confidence note.

Quick IV refresher

Asset and Flaw basics

An Asset increases one stat, while a Flaw decreases one stat (for most unmerged heroes). Depending on growth values, the change can be bigger on some stats, leading to what players often call a superboon or superbane.

• Asset (boon): usually a positive stat shift
• Flaw (bane): usually a negative stat shift
• Superboon/superbane: larger-than-usual shift on certain stats

Why IVs matter

For casual content, any decent unit works. But in high-end modes (Arena, Aether Raids, Summoner Duels), a good Asset can change key matchups. For example, +Spd can secure doubles, +Atk can secure one-shots, and +Def/+Res can flip survival thresholds.

How to use this calculator correctly

• Use a unit at level 40 and ideally 5★.
• Enter the hero's neutral stats from a trusted FEH database.
• Enter your observed in-game stats from the status page.
• If the hero is merged, set merge state to merged so the result interpretation is more realistic.
• If you are using an Ascended Asset, switch that option to yes.

If results look strange, check for hidden influences such as skills, dragonflowers, support bonuses, blessing effects, and visible buffs from teammates.

Interpreting your result

High confidence result

If you see one positive and one negative difference (or two positives with Ascended Asset enabled), the estimate is usually straightforward.

Medium or low confidence result

If many stats are shifted at once, extra modifiers are probably in play. This commonly happens with merged units, supports, flowers, or when checking stats with skills equipped.

Best IV choices by role

• Fast offensive units: +Spd or +Atk
• Slow nukes: +Atk
• Physical tanks: +Def or +HP
• Magical tanks/supports: +Res or +HP
• Utility supports: usually +HP for survivability and support checks

Common FEH IV mistakes to avoid

• Judging IVs based on pre-combat buffed stats
• Ignoring merge effects when comparing to neutral tables
• Forgetting that Ascended Assets create a second boosted stat
• Overvaluing perfect IVs over skill synergy and team composition

Final thoughts

A good IV helps, but it is only one part of building a strong hero. Weapon choice, skills, seals, support partners, and map strategy often matter even more. Use this IV calculator as a fast diagnostic tool, then focus on complete team performance.

Note: This is a fan-made educational calculator and is not affiliated with Nintendo or Intelligent Systems.