Idle Growth Calculator
Project compound growth in an idle or incremental game from a starting amount, a per-period growth rate and the number of periods, with the doubling time. Calculates in your browser.
Final amount
-
Show the math
Idle and incremental games compound: each period multiplies the total by one plus the growth rate.
final = start × (1 + rate)ⁿ
By the rule of 72, the doubling time is roughly 72 ÷ (rate %), this calculator uses the exact logarithm.
All math runs locally in your browser.
What this does
An idle growth calculator projects compound growth in an idle or incremental game from a starting amount, a per-period growth rate, and the number of periods, with the doubling time.
How to use it
- Enter the starting amount.
- Set the per-period growth rate.
- Enter the number of periods.
- Read the total and doubling time.
How it works
Each period multiplies the total by one plus the growth rate, so gains build on previous gains. A period is whatever your rate applies to.
total = start × (1 + rate)^periods
Understanding your result
Because each period multiplies the last, growth is exponential, so small rate differences explode over time, and the doubling time is the most intuitive way to feel that. A rate that looks tiny per tick compounds into enormous totals given enough periods, which is exactly why idle games pace upgrades to keep the curve from running away too soon.
Example
Growing 2% per tick doubles in about 35 ticks.
Sources & methodology
Last updated .
Frequently asked questions
How does the growth compound?
Each period multiplies the total by one plus the growth rate, so gains build on previous gains.
What is a period?
Whatever your rate applies to, a tick, a second, a prestige or an upgrade.
Is my data kept?
No. Everything is computed locally in your browser.
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