Gaming
Gacha Drop Rate Calculator
Calculate gacha drop rates, pity systems, and probability in games
P(drop in N attempts)45.22% View results
%
Real-time Results
P(drop in N attempts)
45.22%
Expected Pulls
167pulls
Average number of pulls needed for success
Milestone Pull Counts
Pulls needed to reach probability milestones
| Item | Value |
|---|---|
| 50% chance of at least 1 | 116 pulls |
| 90% chance of at least 1 | 383 pulls |
| 99% chance of at least 1 | 766 pulls |
| Expected pulls for 1 copy | 167 pulls |
| Expected pulls for 1 copies | 167 pulls |
Supported inputs
| Input | Description |
|---|---|
| Base Drop Rate (%) (%) | Base probability of getting the target item |
| Number of Attempts / Pulls | How many times you will try |
| Pity Limit (0 = no pity) | Guaranteed drop after this many failed attempts |
| Number Desired | How many copies of the item you want |
Formula
P(at least 1 in n) = 1 − (1 − p)ⁿ Expected pulls = ⌈1 / p⌉ (geometric distribution) Pulls for X% = ⌈log(1−X%) / log(1−p)⌉
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