Investment Payback Calculator
This investment payback calculator shows how long an investment takes to pay for itself. You enter the amount you invested and the cash it brings in each year, and it works out the payback period in years.
It is a quick way to compare options, such as two pieces of equipment or two property improvements. It is simple arithmetic, so it does not replace advice from a qualified adviser, and you should check the figures with your lender or bank where they matter.
How to use the investment payback calculator
- Enter the amount invested in pounds (£) in the first box.
- Enter the cash the investment brings in per year in pounds (£) in the second box.
- Check that both figures are for the same investment and use the same money basis.
- Read the payback period shown in years.
- Change one figure at a time to see how the result moves.
- Compare the result with the length of time you are prepared to wait for your money back.
The formula
- Payback period (years) = amount invested ÷ cash brought in per year
- Assumes the same cash every year; it ignores interest and the value of money over time
Worked example
The figures below are made up to show the maths. They are not current prices, rates or product figures.
| Amount invested | £20,000.00 |
|---|---|
| Cash it brings in per year | £5,000.00 |
- Payback period 4 years
- Payback period 4.00 years
Tips for an accurate answer
- Use the cash you actually expect to receive after running costs, not the gross figure, so the result reflects what really comes back.
- Keep the yearly cash figure realistic. If it varies from year to year, use a sensible average and note that the result is an estimate.
- Remember that the calculator assumes the same cash arrives every year. Test a lower figure to see how much a weaker year would change the answer.
- Note that the calculator ignores interest and the falling value of money over time. Those matter for longer investments.
- Write down the inputs you used so you can compare options fairly later.
Questions people ask
How to calculate investment payback?
Enter the amount you invested and the cash the investment brings in per year. The calculator divides the first figure by the second and shows the result as a payback period in years. This gives a quick view of how long the investment takes to repay what you put in.
What's the difference between ROI and payback?
This calculator only shows payback, which is the number of years needed for the yearly cash to equal the amount invested. It does not calculate a return on investment percentage. Enter your amount invested and yearly cash to see the payback period.
Can I work out payback using monthly cash figures?
This calculator works with a yearly cash figure, so enter the cash your investment brings in per year. If you have a monthly figure, multiply it by twelve first. The result will then show the payback period in years.
How do I use a payback period calculator?
Enter the amount invested in the first box and the cash it brings in per year in the second. The calculator shows the payback period in years. Use the same money basis for both figures so the result is meaningful.
What does the investment payback calculator tell me?
It tells you how many years it takes for the yearly cash from an investment to equal the amount you put in. You enter the amount invested and the cash it brings in per year. The answer is shown as a payback period in years.
Does this calculator include interest?
No. It divides the amount invested by the yearly cash and does not account for interest or the changing value of money. For a more detailed view, consider a method that discounts future cash, and check with a financial adviser.
Can I use this for any type of investment?
You can use it for any investment where you can estimate the amount put in and the cash it brings in each year. The result is only as reliable as those two figures.
Why does the calculator assume the same cash every year?
The payback period is calculated on the basis of a steady yearly figure, which keeps the maths simple. If your cash will vary, work out the result with a few different figures to see the range of outcomes.
Sources
This calculator uses the standard loan and interest formulas above and the numbers you type. It needs no outside figures.
An estimate from the numbers you enter, worked out with the formula shown. It is maths, not financial advice: your lender or bank has the final figures. Page checked 23 Oct 2026. Read the disclaimer