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Payback Period Calculator

See how long an investment takes to pay for itself. Enter the upfront cost and the yearly cash it returns, then press Calculate for both the simple and discounted payback period.

Written by TopicDrill Editorial Team·Updated June 2026

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Fill in the details, then press Calculate.

$
$

Payback period

4 yr 2 mo

Discounted payback5 yr 3 mo
Total cash inflows$96,000
Net profit at horizon$46,000

Cumulative cash flow

Nominal Discounted
$-50.0k$-26.0k$-2.0k$22.0k$46.0k0 yr4 yr8 yr

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How the payback period calculator works

The calculator starts your balance at a negative number equal to the money you put in, then adds each year of cash flow on top. The moment that running total crosses zero is the point where the investment has paid for itself. The headline figure is the simple payback period in years and months.

The discounted version repeats the same march to break even, but first it shrinks every future inflow using your discount rate. Because a dollar arriving in year five is worth less than a dollar today, the discounted line climbs more slowly and reaches break even later. The chart plots both lines so you can see the gap.

A worked example

Suppose you spend $50,000 on equipment that returns $12,000 of cash a year. Dividing the cost by the annual flow gives a simple payback of about 4 years and 2 months. Apply an 8% discount rate and the same project takes roughly 5 years and 4 months to recover in present-value terms, because the later cash counts for less.

Things to keep in mind

Payback rewards speed but ignores everything that happens after break even, so a quick payback is not the same as the most profitable choice. Read the Investopedia overview of payback period for the wider context. To weigh total profitability instead, switch to our ROI calculator.

Frequently asked questions

What is a payback period?

The payback period is the length of time it takes for the cumulative cash flows from an investment to add back up to the amount you originally spent. A shorter payback period means your money is at risk for less time before you break even.

How is the payback period calculated?

With even yearly cash flows, payback equals the initial investment divided by the annual cash flow. When the recovery happens partway through a year, this tool interpolates within that year so you get a fractional figure like 4 years and 2 months rather than rounding up to a whole year.

What is the difference between simple and discounted payback?

Simple payback adds up raw cash inflows and ignores the time value of money. Discounted payback first shrinks each future inflow by a discount rate, so later money counts for less. Because discounted cash flows are smaller, the discounted payback period is always equal to or longer than the simple one.

What are the limits of the payback period?

Payback tells you how quickly you recover your outlay but says nothing about profit earned after that point. An investment that pays back fast can still earn less overall than one that pays back slowly. Pair payback with net present value or return on investment before deciding.

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