This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Peel THE Potato session. It will not click the shop.
Drop probability
Class roll chance
Estimates the chance of seeing one class at least once in the number of rolls you enter. Use the percent shown on the class screen. This is the installed independent-roll formula, not an in-game guarantee.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
The default 0.1 is the Hero of the Potatoes chance shown on the class screen. Swap in 2.4 for Potato Expert, 12.5 for Mechanic, 15 for Digger, 20 for Comrade, or 50 for Peasant. The form treats every roll as independent. No pity counter has been published.
Material planner
Peels left to the Hand Peeler checkpoint
Shows how many peels are left before the reported Hand Peeler checkpoint. Enter the peel count from your current run.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
Leave peels per unit at 1 and type your current peel count as the owned value. 2,500 is the peel count where reviewed runs unlocked the Hand Peeler machine. It is not the size of the mountain and not a key location. If a later update moves the unlock, change the checkpoint number.
Upgrade payback
Upgrade payback from your numbers
Turns a Cash cost and the extra Cash you expect each cycle into a payback estimate. Both inputs come from your run, not from a hidden game formula.
Payback cycles = upgrade cost ÷ extra profit per cycle, rounded up.
100 Cash, 10 extra Cash, and 1 minute are example starters so the form is not blank. Replace all three with numbers you can see in your own run. The game does not publish one payback rate for every upgrade.