Calculate the probability of obtaining at least one desired item from gacha pulls using cumulative binomial distribution: P(X ≥ 1) = 1 – (1-p)^n
Success Probability
Failure Probability
Expected Pulls for Success
Expected Successes
How to Use Cumulative Binomial Pull Probability for Gacha Calculator
- Enter the drop rate percentage and number of gacha pulls you plan to make
- Optionally adjust pity system settings if your game uses one
- The calculator shows your odds of getting at least one success