This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Bunker vs Verity session. It will not click the shop.
Drop probability
Egg hatch chance
Estimate the chance of seeing one listed pet at least once. Type the percent printed on that egg in the Egg Shop. The default is a demo from one Grass Egg menu, not a live rate.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
The 1% default matches one Grass Egg reading of Mini Verity. Each egg on that menu used the same 44, 28, 16, 7, 4, 1 pattern with different pets. Rolls are treated as independent. Recheck the Egg Shop before spending Crystals.
Upgrade payback
Coin generator payback
Estimate how many cycles a coin generator needs to cover its price. Enter the price and the extra coins you see per cycle. The filled defaults are a demo, not current shop prices.
Payback cycles = upgrade cost ÷ extra profit per cycle, rounded up.
Do not treat the defaults as game rates. Separate sessions described a farm item as giving 14 coins, a farm paying about every 10 seconds, a crystal plantation narrated at 100 coins per second, and a coin press bought for 35000 coins. Those figures are not one item and are not a current price list.