This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Illegal Soccer session. It will not click the shop.
Drop probability
At least one success in a shop roll
Enter the chance shown on the shop roll and how many rolls you might buy. The result is the chance of at least one success if every roll is independent. Replace the demo 1 with the percentage on your screen. Two published tables disagree, so the client text wins.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
Type the percentage printed on your Your Items roll. The 1 default is only a demo, because September 2026 fan tables list the Jetpack at both 1.0% and 0.6%. Each roll is treated as an independent repeat. The result is the chance of at least one success. Pity, featured-slot bonuses, and duplicate protection are not included, because those rules are not established. This does not read your inventory.