This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own [UPD 1.5] UMA DASH session. It will not click the shop.
Drop probability
Perk drop chance
Chance of at least one race perk drop from the published finish bonuses. Pity and the drop-rate gamepass are outside this form.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
Enter the published finish chance, not a guessed drop rate. 1st is 30, 2nd is 27.5, 3rd is 25, 4th is 22.5, and 5th or lower is 15. The result is the chance of at least one perk across that many independent races. It ignores the 15-race legendary pity, the 100-race mythical pity, the 2x Perk Drop gamepass, and the V0.13 rule that a legendary or mythic roll has a 40% chance to match your equipped Uma.
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