Calculate how many months or years it takes to recover an investment from its cash flows — simple and discounted payback periods.
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Payback Period Calculator
Enter your initial investment and either an annual cash inflow or year-by-year cash flows. Get simple and discounted payback periods.
Investment
Leave blank if cash flows vary by year below
Variable Cash Flows — Optional
Please enter an initial investment and at least one annual cash flow greater than zero.
Simple Payback Period
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Simple Payback
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Discounted Payback
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Initial Investment
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Annual Inflow
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Cumulative Yr 2
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Cumulative Yr 4
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Simple vs discounted: Simple payback ignores the time value of money — $40,000 in year 3 counts the same as $40,000 today. Discounted payback adjusts each year's cash flow for the cost of capital, giving a more realistic (and longer) recovery estimate.
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What Is the Payback Period?
The payback period is the time required to recover the cost of an investment from its cash inflows. Spend $120,000 and earn $40,000 a year, and you've paid back the investment in 3 years. It's one of the simplest investment evaluation tools, widely used for capital expenditure decisions, equipment purchases, and project approvals — especially in businesses where capital is constrained and recovery speed matters. The faster you get your money back, the lower the risk.
Simple vs Discounted Payback
Simple Payback = Initial Investment ÷ Annual Cash Inflow
(or: the year when cumulative cash flows = investment)
Discounted Payback: adjusts each year's flow by (1+r)^year first
Simple payback treats cash equally regardless of when it arrives. Discounted payback corrects for this — a $40,000 inflow in year 3 is worth less than $40,000 today. By discounting future cash flows, the discounted payback period is always equal to or longer than simple payback, but it's the more financially rigorous measure.
What Is a Good Payback Period?
Under 2 years: fast, generally excellent for most asset classes
2–4 years: acceptable for most capital investment decisions
Over 5 years: requires strong justification — uncertainty increases and capital is tied up longer
The payback period should always be compared against the asset's expected useful life — a machine that pays back in 4 years but lasts 15 is a great investment
Worked Example
A $120,000 investment returns $25,000 in year 1, $35,000 in year 2, and $45,000 in year 3. Cumulative: $25k, $60k, $105k — not there yet. Year 4 at $50,000 would push cumulative to $155,000. Payback falls partway through year 4: $120,000 − $105,000 = $15,000 left after year 3, recovered at ($15,000 ÷ $50,000) × 12 = 3.6 months into year 4 — so about 3 years and 4 months.
Limitations of Payback Period
Ignores cash flows after payback — a project that pays back in 2 years and generates returns for 20 more years looks the same as one that stops at year 2
Doesn't measure profitability — pair it with ROI or NPV for a complete picture
Simple version ignores time value of money — use discounted payback for more rigorous decisions
💡 Payback period is a risk metric as much as a return metric — the faster you recover capital, the less exposure to uncertainty, market changes, and technology shifts. Use it alongside ROI and CAGR for complete investment evaluation.
Frequently Asked Questions
How do you calculate payback period?
Divide the initial investment by the annual cash inflow. A $120,000 investment returning $40,000 per year pays back in 3 years. For uneven cash flows, sum year-by-year until cumulative inflows equal the investment, then pro-rate the final year.
What is a good payback period?
Under 2 years is generally excellent; 2–4 years is acceptable for most capital investments. Beyond 5 years requires strong justification. The payback period should be weighed against the asset's useful life — a machine paying back in 4 years but lasting 15 is a strong investment.
What is discounted payback period?
A payback period calculation that adjusts each future cash flow for the time value of money before accumulating them. Each year's inflow is divided by (1+discount rate)^year, making it more rigorous than simple payback. Discounted payback is always equal to or longer than the simple version.
What are the limitations of payback period?
It ignores cash flows after the payback date, doesn't measure total profitability, and the simple version ignores the time value of money. A project paying back in 2 years that generates strong returns for 20 more years looks identical to one that stops at year 2. Always pair payback with ROI or NPV.
Why do businesses use payback period?
For its simplicity and risk-assessment value. A fast payback means less exposure to uncertainty, technology changes, and market shifts. It's easy to communicate and approve, especially for non-financial stakeholders. It's most useful as a quick filter before more detailed analysis.
What is the difference between payback period and ROI?
Payback period measures how quickly you recover the investment; ROI measures the total return relative to the cost. They answer different questions: payback is about recovery speed and risk; ROI is about profitability. Use both — a short payback with low ROI is less attractive than a moderate payback with high long-term returns.
Does payback period account for profit?
Simple payback only considers recovery of the initial cost, not profit beyond that. To evaluate profitability, calculate ROI (total return above investment ÷ investment), or NPV (net present value), which shows value created beyond the required return.
How do I calculate payback for uneven cash flows?
Sum year-by-year cash flows until the running total reaches the initial investment. In the final year, pro-rate: remaining amount ÷ that year's cash flow × 12 gives the exact month of payback. This calculator handles variable flows up to four years, plus even-flow projections beyond that.
Is my data private?
Yes. Every calculation on this page runs entirely inside your browser using JavaScript. Nothing you type is stored, logged, or sent to any server, and you can use the calculator offline once the page has loaded.
