This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own [NEW] Tap Simulator: Reborn session. It will not click the shop.
Drop probability
Egg roll chance
Estimate the chance of at least one success across a number of hatches, using the percent printed on your egg. The default is an example from one reported secret, not a universal drop rate.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
The 0.0002 default is only an example of the reported Void Overseer rate, 1 in 500,000. Replace it with the percent on the egg you are opening. This form estimates independent rolls. It does not model the 15,000-hatch secret pity, Secret Hunter, or multi-roll passes.
Material planner
Bouncy Key Slime
See how much Slime is still missing for the Bouncy Key. Enter the Slime already in your inventory. The quest total used here is 20.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
The Invisible Toilet asks for 20 Slime. Each defeated Glow Mushroom is reported to drop 4 Slime, so a full order is five defeats when you start from zero. This form only subtracts the Slime you already hold from 20. It does not convert that remainder into defeats.
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