Gacha Probability Calculator
Chance of at least one in 100 pulls63.4%
Average pulls100
Pulls for 50%69
Pulls for 90%230
Pulls for 99%459
About this tool
With chance p per pull, the chance of at least one hit in n pulls is 1 − (1 − p)ⁿ. At 1%, 100 pulls give only 63.4%; you need 69 pulls for 50%, 230 for 90% and 459 for 99%.
With a pity count, the item is guaranteed at that pull. At 0.6% with pity at 90, the chance of hitting before pity is 41.8%, and the average pulls drop below the no-pity value (about 167).
Try it simulates pulls one by one at the same odds and shows when it hit — different every time. Games with soft pity or rate-ups may differ.
FAQ
Does 100 pulls at 1% guarantee a hit?
No — 63.4%. 36.6% of the time it never appears in 100 pulls.
How do I enter pity?
Enter the guaranteed pull count, or 0 for none.
What about soft pity?
Games that raise the rate late will hit slightly sooner than this estimate.