Payback Period Calculator
Calculate how long it takes to recover an initial investment from annual cash inflows, with both simple and discounted payback periods.
Example
A $50,000 machine generates $12,000 of cash each year. Simple payback = 50,000 / 12,000 = 4.17 years (about 4 years 2 months).
Adding an 8% discount rate, future cash is worth less, so the discounted payback stretches to 5.28 years — the point where cumulative discounted inflows first reach $50,000.
How it works
Enter the initial investment, the annual cash inflow it generates, and an optional discount rate. The tool divides investment by inflow for the simple payback and accumulates discounted cash flows to find the discounted payback.
Good to know
The Payback Period Calculator estimates how long it takes for the cash an investment generates to add back up to the money you put in. You enter an initial investment, the cash it brings in each year, and (optionally) a discount rate, and it returns both the simple payback period and the discounted payback period in years and months. It is built for anyone weighing a one-off purchase against the return it produces: a small-business owner sizing up new equipment, a property investor checking a renovation, or a student learning capital budgeting.
Reach for this tool when you have a concrete upfront cost and a roughly steady annual cash inflow, and you mainly want to know how soon you get your money back rather than total profit. It is especially handy for quick comparisons between two options or for setting a "must pay back within X years" cutoff. Because it favors speed of recovery, it works best as a first-pass screen alongside fuller measures, not as the sole basis for a decision.
Read the result as the moment your cumulative cash inflows first equal the initial outlay. The simple figure ignores the time value of money, so it is the optimistic floor; the discounted figure shrinks each future year's cash by the rate you enter and is always equal to or longer, making it the more conservative view. The annual ROI shown is simply yearly inflow divided by the investment, and the year-by-year table lets you see exactly when the cumulative column crosses your investment amount.
One practical caveat: the model assumes the same cash inflow every year, received at year-end, with no taxes, inflation drift, or salvage value. Real projects rarely behave that way, so if your cash flows ramp up, taper off, or include a resale at the end, treat the output as a ballpark. A useful habit is to run the discounted version with a rate at least as high as your borrowing cost or required return, so the payback you see reflects what the money could have earned elsewhere.
Frequently asked questions
What is the difference between simple and discounted payback?
Simple payback divides the investment by the yearly cash inflow, ignoring the time value of money. Discounted payback first shrinks each year's cash by the discount rate, then counts how long until those discounted inflows add up to the investment — always equal to or longer than simple payback.
Why does the calculator say 'Never'?
If the annual cash inflow is zero, the investment can never be recouped, so the period is infinite. For discounted payback, an inflow that is too small relative to the discount rate may also never accumulate to the initial amount within the calculation horizon.
Is my data uploaded anywhere?
No — this calculator runs entirely in your browser; nothing is uploaded.
Is this financial advice?
No. These are educational estimates — consult a qualified financial professional before making decisions.
People also ask
What is a good payback period?
There is no universal threshold; it depends on the industry, the lifespan of the asset, and how much risk you are willing to accept. Shorter paybacks recover capital faster and are generally seen as lower risk, but many businesses set their own internal cutoff, such as recovering equipment costs within two or three years.
How do you calculate payback period?
For even cash flows, divide the initial investment by the annual cash inflow. For uneven cash flows or when accounting for the time value of money, you accumulate each year's inflow until the running total reaches the initial investment, and the payback is the point where that total first crosses it.
What are the disadvantages of the payback period method?
It ignores any cash flows that occur after the payback point, so it overlooks total profitability and long-term value. The simple version also ignores the time value of money, which can make slow-returning projects look better than they are.
Is payback period the same as ROI?
No. Payback period measures the time it takes to recover the original investment, expressed in years, while ROI measures the return relative to the cost, usually as a percentage. A project can have a short payback but a low overall ROI, or vice versa.
What discount rate should I use for discounted payback?
Many people use their cost of capital, the interest rate on borrowed funds, or a required rate of return that reflects the risk of the project. A higher rate reduces the value of future cash and lengthens the discounted payback period.
How do you convert a decimal payback period into months?
Multiply the fractional part of the year by 12. For example, 4.17 years means 0.17 times 12, which is about 2 months, giving roughly 4 years and 2 months.
Does the payback period account for inflation or taxes?
This calculator does not; it assumes constant pre-tax cash inflows and only adjusts for the time value of money when you enter a discount rate. To reflect inflation or taxes, you would need to use after-tax, inflation-adjusted cash flow figures as your inputs.
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