M+ Calculator

Reviewed by David Chen, SMT Fusion Expert. Utilizing advanced theoretical fusion mechanics to help you optimize your demon party.

The Shin Megami Tensei V Fusion Calculator is an essential tool for creating powerful demons. Input any three of the four core fusion variables—Demon A Level, Demon B Level, Fusion Modifier, and Result Demon Level—to accurately solve for the missing value and streamline your demon progression planning.

Shin Megami Tensei V Fusion Calculator

Enter inputs above and click Calculate.

Shin Megami Tensei V Fusion Calculator Formula

The simplified fusion formula used in this calculator for planning potential demon levels is:

F = (Q + P) × V

Where:

  • F: Result Demon Level
  • Q: Demon A Level
  • P: Demon B Level
  • V: Fusion Modifier (reflecting demon ranks, essence inheritances, and moon phase effects)
Formula Source (Theoretical basis for rank calculation): Megami Tensei Wiki – Fusion Mechanics

Variables Explained

  • Demon A Level (Q): The base level of the first demon you are fusing. Must be a positive number.
  • Demon B Level (P): The base level of the second demon you are fusing. Must be a positive number.
  • Fusion Modifier (V): A variable representing the overall rank adjustment from special fusion types, skills, and the game’s moon phase system. Typically ranges from 0.8 (downward shift) to 1.5 (upward shift).
  • Result Demon Level (F): The final level of the demon created by the fusion process, which dictates the demon’s base stats and ability to learn skills.

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What is the Shin Megami Tensei V Fusion Calculator?

In the world of Shin Megami Tensei V (SMT V), demon fusion is the primary mechanism for acquiring new, more powerful party members. While the in-game system often dictates the exact demon produced (based on Arcana combination), its resulting level and potential power are complex, incorporating various factors like the base levels of the fusion materials, the rarity of the resulting demon, and environmental conditions (like the Kagutsuchi/Moon Phase).

This calculator provides a planning tool by allowing players to reverse-engineer their fusion goals. Instead of blindly fusing, you can set a target Result Demon Level (F) and the levels of your material demons (Q and P) to determine the exact Fusion Modifier (V) required. This helps players understand how much skill or rank adjustment is necessary to hit a specific power benchmark for end-game optimization or speedrunning.

Mastering the fusion process is key to victory in SMT V. Use this tool to predict outcomes, verify the effectiveness of different demon combinations, and ensure your new demons are battle-ready with the optimal level for their role.

How to Calculate Result Level (F) – Example

  1. Determine Input Levels: You are fusing a Level 35 demon (Q) and a Level 40 demon (P). $$\text{Q} = 35, \text{P} = 40$$
  2. Identify the Fusion Modifier: Due to a full moon and inherited special skills, you estimate a Fusion Modifier (V) of 1.15. $$\text{V} = 1.15$$
  3. Sum the Input Levels: Add the levels of the two material demons. $$\text{Q} + \text{P} = 35 + 40 = 75$$
  4. Apply the Modifier: Multiply the sum by the Fusion Modifier to find the Result Demon Level (F). $$\text{F} = 75 \times 1.15 = 86.25$$
  5. Interpret the Result: The resulting demon is predicted to be Level 86 (rounded down for the game’s actual level mechanics).

Frequently Asked Questions (FAQ)

What happens if I enter all four values?
If all four variables (Q, P, V, and F) are entered, the calculator will perform a consistency check. It will tell you if the inputs match the formula (F = (Q + P) × V) within a small margin of error. If they are inconsistent, it will display an error message.

What is the “Fusion Modifier (V)”?
V is a conceptual variable in this calculator that aggregates all non-level factors affecting the final demon power, such as the inherent rank difference between demons, special fusion rules (e.g., elemental fusions), and the current moon phase (Kagutsuchi). In the game, this corresponds to the complex rank-shift mechanics.

Can this calculator predict the actual demon name?
No. This calculator is a level-planning and theoretical optimization tool. It does not use the Arcana system to predict the exact demon name. For exact name prediction, you must use a traditional SMT Fusion Chart.

Why does the result need to be positive?
Demon Levels are physical constraints; they cannot be negative. The calculator includes boundary condition checks to prevent non-physical or illogical results and will display an error if the calculation yields a negative level.

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