This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own [⭐UPD] Survive Your Ideas session. It will not click the shop.
Drop probability
At least one spin of a chosen rarity
Estimates the chance of seeing a rarity at least once across independent spins. The default 0.1 matches the Mythical row on a captured Items menu. Lucky Spin was labeled Rare or better in that capture, so do not assume it uses this table. Change the percent to the row you care about.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
Menu snapshot, not a live audit: Common 50, Uncommon 28, Rare 15, Epic 5.5, Legendary 1.4, Mythical 0.1. Those six figures add to 100. The formula treats each spin as an independent draw with that chance. It does not know pity, duplicate protection or a separate Lucky Spin table.
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