This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own (π₯) Dummy Defense session. It will not click the shop.
Upgrade payback
Cash upgrade payback
Estimate how many waves a Cash upgrade needs before extra income covers its cost. You type the numbers. Dummy Defense does not publish one payback formula for every tower. A public note estimates that each Business Dummy level pays for itself in about four waves; that estimate is not built into the math.
Payback cycles = upgrade cost Γ· extra profit per cycle, rounded up.
Cash is match-only. It comes from damage, wave rewards, and generators such as Business Dummy. Armor, shields, and No Cash enemies do not pay. Use a wave as one cycle. The defaults are examples, not in-game prices.
