Payback Period Calculator
Payback period calculator: how many years an investment takes to recover its cost from annual cash flow.
t = I0CF
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
Payback period = initial investment ÷ annual net cash flow. It is a quick way to compare solar panels, equipment or business projects.
It ignores the time value of money and cash flows after payback; use present value for a fuller picture.
Estimates for information only, not financial advice.
Formula
t = I0CF
| Symbol | Quantity | Units |
|---|---|---|
| I0 | Initial investment | $, €, £ |
| CF | Net cash flow per year | $, €, £ |
| t | Payback period | years, months |
Worked example
Given: I0 = 12,000.00 $ · CF = 3,000.00 $
t = I0CF
Result: t = 4 years
Frequently asked questions
How long does a $12,000 investment saving $3,000 a year take to pay back?
12,000 ÷ 3,000 = 4 years.