This Gakuran reroll calculator estimates the chance of hitting a target after repeated attempts using a probability you enter. It does not claim that the input chance matches a verified in-game Gakuran drop rate.
User-entered assumption
Reroll probability calculator
Enter a target chance yourself. This keeps the math useful without pretending that Gakuran drop rates are currently verified.
Formula: 1 − (1 − p)n. It assumes the same independent chance on every attempt. No Gakuran style, clan, aura, or height rate is supplied by this tool.
How the Gakuran reroll calculator works
The interactive tool uses a general repeated-attempt model. If p is the chance of success on one attempt and n is the number of attempts, the chance of at least one success is:
1 - (1 - p) to the power of n
The calculator also shows the complementary chance of missing every attempt and the expected number of attempts at the entered rate, calculated as 1 divided by p. These are mathematical estimates, not hidden game data.
Why the target chance is user-entered
Current Gakuran code guides discuss rerolls, styles, and character traits, but no verified current table for a target style or rarity was found. Some public pages also disagree on the current game state. Supplying a default “Legendary” or “Wrestling” rate would make the tool look precise while smuggling in an unsupported claim.
Enter a chance only when you have a source or a test result you are willing to treat as an assumption. Label it in your own notes. If a future official source gives a rate, the page can add a versioned preset with a source and checked date.
How to read the outputs
Chance of at least one hit answers: under this input, how likely is one or more successes across the number of attempts? Missing every time answers the inverse. Expected attempts is a long-run average and not a promise that the next result will arrive on that attempt.
The tool assumes each attempt is independent and uses the same chance. It does not model pity systems, changing pools, account history, code availability, or a guarantee mechanic. If Gakuran uses any of those systems, the simple model should not be treated as an in-game forecast.
Pair the math with the source check
Use the Gakuran codes page for reported reroll rewards, the Gakuran status page for access, and the source policy for confidence labels. The Gakuran reroll calculator is useful precisely because the assumption is visible and editable. Return to the Gakuran reroll calculator when a verified rate becomes available.