Gacha Pity & Pull Probability
Calculate the chance of getting a rare item within a number of pulls, the expected pulls and the cost with a hard pity guarantee, free online.
About this calculator
With a drop rate p per pull, the chance of at least one success in n pulls is 1 − (1 − p)ⁿ. A hard pity guarantees the item at pull N, so the expected number of pulls is (1 − (1 − p)^N) ÷ p. Soft-pity rate increases are not modelled here.