About the Payback Period Calculator
A payback period calculator finds how long an investment takes to recover its initial cost from its cash inflows. It is the simplest capital budgeting measure and the one most often used as an initial screen.
The formula
Payback period = initial investment / annual cash inflowThe simple payback ignores the time value of money. A discounted payback period discounts each inflow before accumulating it, giving a longer and more accurate figure.
How to use this calculator
- 1Enter your Initial Investment ($). The field starts at
100000, which you can overwrite. - 2Enter your Annual Cash Inflow ($). The field starts at
25000, which you can overwrite. - 3Enter your Discount Rate (%) for NPV. The field starts at
8, which you can overwrite. - 4Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Initial Investment ($) | 100000 |
| Annual Cash Inflow ($) | 25000 |
| Discount Rate (%) for NPV | 8 |
Result
Simple Payback: 4 years 0 months
NPV at 8%: $-182.25
Annual ROI: 25.00%
First Year Return: 25.00%
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
Payback period is popular because it is intuitive and speaks directly to risk: a shorter payback means less time exposed to uncertainty. For projects in volatile markets or with fast-moving technology, that is a genuinely relevant consideration that NPV does not capture directly.
Its major flaw is that it ignores everything after the payback point. A project recovering its cost in three years then stopping scores identically to one recovering in three years and generating cash for twenty more. This is why payback should screen projects rather than choose between them, with NPV or IRR making the actual decision.
Things worth knowing
- Use discounted payback rather than simple payback where the horizon is long, since money later is worth less.
- Payback ignores all cash flows after breakeven, which is its most serious limitation.
- Shorter payback means lower risk exposure, which matters most in uncertain or fast-changing markets.
- Many companies apply a maximum acceptable payback as a screening rule before detailed analysis.
- Combine payback with NPV. Payback measures risk, NPV measures value.
Frequently asked questions
How do I calculate payback period?+
Divide the initial investment by the annual cash inflow. A 100,000 dollar project generating 25,000 a year pays back in four years.
What is a good payback period?+
It varies by industry and risk. Many companies want under three to five years for capital projects, while energy efficiency upgrades are often accepted at seven to ten given their long asset lives.
What is discounted payback period?+
The same calculation with each inflow discounted to present value first. It gives a longer and more accurate figure because it accounts for the time value of money.
Why is payback period criticised?+
Because it ignores all cash flows after breakeven and, in its simple form, the time value of money. It measures how quickly you recover cost, not how much value the project creates.