Idle Game Growth and Cost Calculator
Works out the cost curve behind an idle or incremental game.
Cost to buy them
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Cost of the next one —
How many you can afford now —
Wait to afford them —
Time for them to pay for themselves —
Reading this —
The formula
next = base × growth^owned bulk = next × (growth^n − 1) ÷ (growth − 1) affordable = ⌊log(1 + money × (growth − 1) ÷ next) ÷ log(growth)⌋
Each purchase costs a fixed multiple of the last, so costs grow exponentially. Income multipliers and upgrades are not included.
What to watch out for
When choosing between buildings, the one with the shortest payback usually pays off soonest.
Frequently Asked Questions
What do 10 more cost at 100 base, ×1.15, with 10 owned?
8,214.
Why does the next one get so expensive?
Costs multiply: at ×1.15, the 100th costs 1,021,142 times as much as the first.