This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Lift a Karen session. It will not click the shop.
Drop probability
Chest roll chance
Estimate the chance of seeing one result at least once across several chest opens. Lift a Karen does not publish drop rates. Enter the percent printed on your own roll screen. The starting chance is 0 so this page does not pretend a rate exists.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
Replace 0 with a percent you can read in game. Ten chests is only a planning input. The formula treats each open as an independent repeat and does not know chest cost, pity, luck passes, or whether a store weight matches a rolled weight.
