Exponential Growth and Decay Calculator
Enter a starting value, a growth or decay rate per period, and the number of periods to project the final value.
Exponential Growth and Decay Calculator
Model exponential growth or decay: project how a starting value changes over a number of periods at a fixed percentage rate per period.
This calculator provides an estimate for general informational purposes only. It is not a substitute for professional financial, mechanical or engineering advice.
Exponential growth and decay both follow the same mathematical pattern — a fixed percentage change applied repeatedly over time — differing only in whether the rate is added or subtracted each period.
Example
- With the default values shown above, this calculator returns: Final Value ≈ 1,628.89; Total Change ≈ 628.89.
Frequently Asked Questions
What is the formula?
Final Value = Initial Value × (1 + rate)^periods for growth, or (1 − rate)^periods for decay.
What are typical uses?
This models population growth, radioactive decay, investment growth, viral spread and any process that changes by a fixed percentage each period.