Persona Fusion Calculator — Fast, Accurate, and Easy to Use
The Persona Fusion Calculator is an essential tool for players of Shin Megami Tensei and Persona game series who want to quickly determine the results of fusing two personas together. Whether you're playing Persona 3, Persona 4, Persona 5, or other SMT titles, understanding fusion mechanics is crucial for building powerful demon teams. This calculator streamlines the complex fusion formula calculations, helping you predict the resulting persona's arcana and base level when combining two source personas. Use this tool to plan your fusion strategies, optimize your compendium completion, and create the exact personas you need for challenging battles. Perfect for both casual players exploring fusion mechanics and speedrunners planning optimal fusion chains, this calculator eliminates guesswork and saves countless hours of trial-and-error experimentation.
Persona Fusion Calculator
Fusion Formula
Standard Two-Persona Fusion Formula:
ResultLevel = ⌊(Level₁ + Level₂) / 2⌋ + 1
Where:
- Level₁ = Base level of first persona
- Level₂ = Base level of second persona
- ResultLevel = Base level of resulting persona
- ⌊ ⌋ = Floor function (round down to nearest integer)
Result Arcana Determination:
The resulting arcana is determined by a fusion chart lookup table. Each pair of arcanas produces a specific result arcana based on predefined combinations. Same-arcana fusion (e.g., Fool + Fool) typically results in a different persona of the same arcana at the calculated level.
Modifiers:
- • Special fusion rules may override standard calculations
- • Some combinations produce specific personas regardless of level
- • Treasure Demon fusions use different mechanics
Step-by-Step Calculation
Using sample inputs: Magician Level 25 + Priestess Level 30
-
Identify Input Personas:
Persona 1: Magician, Level 25
Persona 2: Priestess, Level 30 -
Calculate Average Level:
Average = (25 + 30) / 2 = 55 / 2 = 27.5 -
Apply Floor Function:
Floor(27.5) = 27 -
Add Fusion Modifier:
Result Level = 27 + 1 = 28 -
Determine Result Arcana:
Look up Magician + Priestess in fusion chart
Result: Temperance arcana -
Final Result:
Fusing Magician (Lv.25) with Priestess (Lv.30) produces a Temperance persona at base level 28
Fusion Examples
Example 1: Cross-Arcana Basic Fusion
Inputs:
- Persona 1: Emperor, Level 15
- Persona 2: Lovers, Level 20
- Game: Persona 5 Royal
Calculation:
Average Level = (15 + 20) / 2 = 17.5 → Floor = 17
Result Level = 17 + 1 = 18
Arcana Lookup: Emperor + Lovers → Fortune
Output: Fortune arcana persona at level 18. In P5R, this would typically yield Fortuna (base level 17), so the system would provide the next available Fortune persona at or above level 18.
Explanation: When the calculated level falls between persona base levels, the game selects the first available persona of the result arcana at or above the calculated level. This demonstrates how fusion planning requires knowledge of both mechanics and available personas in each arcana.
Example 2: Same-Arcana Fusion
Inputs:
- Persona 1: Chariot, Level 42
- Persona 2: Chariot, Level 48
- Game: Persona 4 Golden
Calculation:
Average Level = (42 + 48) / 2 = 45 → Floor = 45
Result Level = 45 + 1 = 46
Arcana Result: Chariot + Chariot → Chariot (same-arcana fusion)
Output: Chariot arcana persona at level 46. The result will be a different Chariot persona than either input, typically the one closest to level 46 in the compendium.
Explanation: Same-arcana fusions follow identical level calculation rules but produce a different persona within the same arcana. This is useful for leveling up personas within a specific arcana or accessing higher-tier personas when you only have lower-level versions available.
Edge Cases & Special Scenarios
1. Maximum Level Fusion (Level 99 Personas)
Scenario: Fusing two level 99 personas
Calculation: (99 + 99) / 2 + 1 = 100, but max level is capped at 99
Handling: Result level is capped at 99. The calculator will show level 99 as the result and display a note that maximum level has been reached.
2. Low-Level Fusion (Level 1-2 Personas)
Scenario: Fusing Fool (Lv.1) + Magician (Lv.2)
Calculation: (1 + 2) / 2 + 1 = Floor(1.5) + 1 = 2
Handling: Result is level 2. The calculator correctly handles minimum-level fusions, though the result may exceed available personas of the result arcana at that level (would skip to next available).
3. Missing or Invalid Arcana Selection
Scenario: User attempts calculation without selecting both arcanas
Handling: Calculator validates inputs and displays an error message: "Please select both persona arcanas and enter valid levels." Calculation button remains enabled but produces validation feedback.
4. Treasure Demon Fusion (Special Rules)
Scenario: Fusing a Treasure Demon with a regular persona
Note: Treasure Demons (Regent, Queen's Necklace, etc.) follow special fusion mechanics where they primarily boost the resulting persona's level significantly. This calculator focuses on standard two-persona fusion; Treasure Demon calculations require specialized logic.
Handling: Standard calculator displays result but notes that Treasure Demon fusions may not follow standard formula and should be verified in-game.
5. DLC Persona Fusion Restrictions
Scenario: Attempting to use DLC personas in fusion calculations
Handling: Most DLC personas cannot be used as fusion materials. Calculator includes a note that DLC personas are typically fusion-locked. Users should verify fusion availability in their specific game version.
6. Special Fusion Override
Scenario: Some persona combinations trigger unique special fusions
Example: Specific combinations produce unique personas (e.g., Lucifer, Metatron)
Handling: Standard calculator shows normal fusion result but includes disclaimer that special fusion recipes may override the standard calculation. Advanced users should consult special fusion charts for their specific game.
Frequently Asked Questions
Q: How accurate is this calculator compared to in-game fusion?
A: This calculator uses the standard two-persona fusion formula found in Persona 3, 4, and 5. The level calculation is mathematically accurate. However, the actual persona produced depends on which personas are available at that level in your specific game version, and special fusion rules may override standard calculations for certain combinations.
Q: Why does my result level differ from the actual persona level in the compendium?
A: The calculator determines the base fusion level. The game then searches for the first available persona of the result arcana at or above this level. If no exact match exists, it selects the next higher-level persona in that arcana. Your result may skip levels if no persona exists at the calculated level.
Q: Can I use this calculator for special fusions or multi-persona fusions?
A: This calculator is designed specifically for standard two-persona fusion. Special fusions (3+ personas) and unique recipe fusions follow different rules. For those, consult special fusion charts specific to your game. This tool focuses on the most common fusion scenario.
Q: Does the order of personas matter (Persona 1 vs. Persona 2)?
A: No, the order does not affect the calculation. Fusing Magician (Lv.20) + Emperor (Lv.25) produces the same result as Emperor (Lv.25) + Magician (Lv.20). The formula uses simple addition, so order is irrelevant. However, in-game skill inheritance may vary based on order in some titles.
Q: What happens if I fuse two personas of the same arcana?
A: Same-arcana fusion produces another persona of the same arcana at the calculated level. For example, fusing two Magician personas results in a different Magician persona. The level is calculated the same way, but the result stays within the same arcana family.
Q: How do I determine which skills the resulting persona inherits?
A: Skill inheritance is a separate mechanic not covered by level/arcana calculation. Generally, you can select which skills to inherit during the fusion process in-game. The calculator focuses solely on determining the result persona's arcana and base level.
Q: Are there differences between Persona 3, 4, and 5 fusion mechanics?
A: The core two-persona fusion formula (average level + 1) is consistent across P3, P4, and P5. However, available personas, arcana fusion charts, and special fusion recipes differ between games. The calculator's level math applies universally, but result arcana combinations may vary by title.
Q: Can I save my fusion calculations for later reference?
A: Yes! Click the "Save Scenario" button to store your current inputs and results in your browser's local storage. You can also use the "Copy Summary" button to copy a text summary to your clipboard, or use the share functionality to generate a URL with your current calculation encoded.
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