Payback Period
The Payback Period tells you how long it will take to earn back the money you originally put into a project. In other words, it answers the question: 'When will I have recovered my initial investment?' The answer comes out as an amount of time, usually measured in years.
You calculate it by dividing the initial investment (the upfront money you spend) by the cash flow per year (the amount of money the project brings in each year). The result is the number of years needed before the incoming money equals what you first spent.
When it comes to reading the result, shorter is generally better. A short payback period means you get your money back quickly, which is usually less risky. A long payback period means your money is tied up for a long time before you see it again. Project managers and sponsors use this to compare projects and to judge risk — the sooner you recover your cash, the sooner it's available for other uses.
Think of it like lending a friend $100 and getting $25 back each month. You'd naturally count how many months until you're 'whole' again — that's exactly what payback period measures for a project.
Suppose a project requires an initial investment of $100,000, and it is expected to generate $25,000 of cash each year. You divide the investment by the yearly cash flow: $100,000 ÷ $25,000 = 4. So the payback period is 4 years — after four years, the project will have returned the original $100,000 you invested.
Every PMP formula explained free — plus worked examples and practice in PMP Math, and full timed mocks in the simulator.