Payback Period Calculator
How many years before the money comes back?
Payback Period Calculator
Payback years = initial investment / annual net cash flow; target cash flow = investment / target years.
Calculated instantly
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What This Calculator Does
The Payback Period Calculator shows how many years and months an investment takes to return its initial cost from a steady annual cash flow. It also reports the annual return on cost and the cash flow required to hit a target payback.
How It Works
The initial investment is divided by the annual net cash flow. The result is the number of years to recover the outlay, assuming the cash flow is constant. Multiplying by 12 gives months. Dividing the investment by a target number of years shows the annual cash flow that target would require. Annual return on cost is the inverse of the payback period, expressed as a percentage.
Example
A $50,000 investment returning $12,000 a year pays back in 4.17 years, or 50 months. The annual return on cost is 24 percent. To pay back in 5 years, it would need $10,000 a year, so the actual cash flow clears that target.
Formula
initial investment / annual cash flowpayback years x 12initial investment / target yearsannual cash flow / initial investmentReading the Results
Payback period
Years to recover the initial outlay at a constant cash flow. It is a screening number, not a measure of total profit.
Cash flow needed for target
The annual cash flow that would hit your target payback. Compare it with the realistic cash flow before committing.
Annual return on cost
The reciprocal of payback, useful for a quick comparison with a savings rate. It ignores the timing of cash flows and any residual value.
Sources and References
US Department of Energy - Federal Energy Management Program, Simple Payback
Simple payback calculation for energy projects
A public-sector explanation of the simple payback method and its limitations.
Project Management Institute - Project Economics and Cash Flow
Payback, NPV, and discounted cash flow
Places payback alongside discounted methods that account for the time value of money.
References identify the method or data behind this calculator. Where a standard or tariff changes, the current edition applies, and the assumptions stated above take precedence over a remembered figure.
Frequently Asked Questions
What is a good payback period?
It depends on the risk and the life of the asset. A equipment upgrade might need a 2-3 year payback, while a building retrofit can accept longer. Compare against your cost of capital and the alternatives rather than a single universal threshold.
Does payback account for the time value of money?
Simple payback does not. Discounted payback does, by discounting each year of cash flow before accumulating it. At a high discount rate, the discounted payback is longer than the simple figure. Use NPV or IRR alongside payback for a fuller picture.
What if cash flow changes from year to year?
Simple payback assumes a constant annual figure. For uneven cash flows, accumulate the actual cash flow year by year until it covers the investment, then interpolate within that year. A spreadsheet or the NPV calculator with a cash flow schedule is more accurate.
Is payback the same as break-even?
No. Break-even usually means the sales volume or time at which revenue covers costs in a period. Payback is the time to recover a specific capital outlay. They can use similar arithmetic but answer different questions.
Should I include salvage value or resale?
Simple payback usually ignores it. If the asset has a known resale value, a discounted cash flow that includes the terminal value is a better measure of the investment. Including resale in payback effectively shortens the period and can make a weak project look strong.