Payback Period Calculator
Calculate how long it takes to recover an investment from monthly cash flows or annual returns.
Results are for general guidance only — not professional advice. Learn more.
How to use this tool
Enter your initial investment amount and the net monthly cash flow the investment generates. The calculator assumes constant cash flows each month.
Results include the payback period in months and years, plus a projected break-even date calculated from today. This is useful for evaluating equipment purchases, marketing spend, hiring decisions, or any other business investment.
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Frequently asked questions
What is payback period?
The payback period is the length of time required to recover the initial cost of an investment from the net cash flows it generates. It is one of the simplest capital budgeting metrics, telling you how long before you break even on an investment.
What is a good payback period?
A good payback period depends on the type of investment and industry. For SaaS businesses, a CAC payback period of under 12 months is considered excellent. For capital equipment, 3–5 years may be acceptable. Generally, the shorter the payback period, the less risk involved.
What is the difference between payback period and ROI?
Payback period measures how quickly you recover your initial investment, ignoring everything that happens after break-even. ROI measures the total return as a percentage of your investment. Both metrics together give a more complete picture.
What if my cash flows are uneven?
This calculator assumes constant monthly cash flows. If your cash flows vary, you would need to calculate the cumulative cash flow month by month and identify when it turns positive. For complex scenarios, a spreadsheet model with monthly projections will give more accurate results.