How to use it
- Enter the advertised chance per pull.
- Enter the number of pulls.
- Optionally add a pity threshold for a comparison note, then calculate.
Gacha Probability Calculator
Estimate the probability of at least one success across independent pulls.
About the Gacha Probability Calculator
This probability tool shows how a constant independent pull chance accumulates over a chosen number of pulls.
How it works
The chance of at least one success is 1 - (1 - p)^n. Expected successes are n times p, but an expected value is not a guaranteed outcome.
Pity-system note
The optional threshold is informational only. Game-specific soft pity, guarantees, rate changes and carry-over rules are not modeled.
Use responsibly
Probability estimates cannot predict a specific pull. Set personal limits and never treat a result as a reason to spend more.