Sell Lemons Upgrade ROI Calculator
Add the upgrades you’re weighing up. We rank them by payback time so you always buy the best-value one first.
| Upgrade | Cost | +Income/sec | Payback | |
|---|---|---|---|---|
| 20s | ||||
| 16s |
How upgrade ROI works
Every upgrade costs cash and raises income. The smartest buy earns its price back fastest:
Payback time = upgrade cost ÷ extra income per second
Buy in ascending payback order and favour the latest activity you unlocked (Lemon Dash → Depot → Trading), since each new source scales harder.
Frequently asked questions
How do I know which upgrade to buy first in Sell Lemons?
Buy the upgrade with the shortest payback time — the one whose extra income earns back its cost fastest. Enter each option’s cost and added income, and this calculator ranks them.
What is payback time?
Payback time is the upgrade cost divided by the extra income per second it gives. A 1M upgrade that adds 50K/sec pays back in 20 seconds. Lower is better.
Does this work for managers and automators too?
Yes. Any upgrade with a cost and a measurable income effect can be compared. For quality-of-life upgrades, factor in the time they save you.