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Payback Period Calculator

Find how long an investment takes to pay back.

How it is calculated

The simple payback period tells you how long an investment takes to earn back its cost: payback (years) = initial investment ÷ annual return. Enter the up-front cost and the net amount you expect to receive each year, in the same currency. The annual figure must be above zero, otherwise there is no payback and no result. The answer is in years with two decimals, so 2.50 means two and a half years. This is the simple version: it assumes the same return every year and does not discount future cash flows or count what happens after the cost is recovered.

Worked example

A machine costs 120,000 and is expected to bring in 30,000 of net savings per year. Payback = 120,000 ÷ 30,000 = 4. The tool shows 4.00 years. A cheaper machine at 90,000 saving 25,000 a year gives 3.60 years, so it recovers its cost sooner, though that says nothing about which lasts longer.

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Common mistakes

  • Entering revenue instead of net return. Annual return should be profit or savings after running costs, otherwise payback looks too short.
  • Mixing monthly and annual figures. If the return is monthly, multiply by 12 first, or the result will be in months rather than years.
  • Reading 4.00 as four years and zero days only. It is an average-based figure, so 4.25 means four years plus about three months.
  • Choosing by shortest payback alone. The method ignores time value of money and everything earned after the payback date.
  • Using it with uneven cash flows. If returns change year to year, a single annual figure misleads.

Sources

About this calculator

This calculator finds the simple payback period: how many years it takes for the cumulative cash flow from an investment to equal its upfront cost, using the formula initial investment ÷ annual cash flow. Unlike NPV or IRR, it ignores the time value of money — it just answers "when do I break even," not "was this a good deal."

It's a quick sanity check used by small-business owners weighing a new machine or piece of equipment, homeowners estimating how long solar panels take to pay for themselves in energy savings, and early-stage investors screening projects before running a fuller discounted cash-flow analysis.

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Comments (1)

  • Editorial team

    Simple payback divides the cost by one steady yearly return, so it ignores the time value of money and any cash flow after the break-even point. Two projects with the same payback can be very different over ten years. It is most useful as a quick filter, for example for an energy-saving purchase. The yearly return must be above zero, otherwise there is no result. How do you pick between projects? Tell us whether payback or something else decides.

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