Decide how much to roll under uncertain rates.
Rarities and Rolls
Rarity ladder, probability caveats, and roll-budget planning.
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Questions players ask
Are drop rates published in-game?
No. The rarity defaults in the Roll Cost & Probability Calculator are community estimates that you can edit in the sliders.
What does the 99% currency threshold tell me?
It is the smallest currency budget whose chance of seeing at least one target rarity is 99% under the current rate assumption.
Can I check the math without running a build?
Yes. The pure-math engine is unit-tested for edge cases including p=0, k>n, hard pity, and 10,000-roll caps.