Calculadora de Payback
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
payback = investimento / FC_anual
About this calculator
The Payback Calculator helps you estimate the time needed to recover the invested amount in a project or asset, considering a constant annual cash flow. The calculation is simple: divide the initial investment by the expected annual cash flow. For example, if you invest R$ 100,000 and expect an annual return of R$ 25,000, the payback will be 4 years. This tool is useful for quickly comparing different investment opportunities.
Payback is one of the most straightforward investment analysis methods, as it shows how long it takes for the invested money to return to the investor. However, it does not consider the time value of money nor cash flows after the payback period. Therefore, it is recommended to use it as a first filter, combined with other metrics like NPV or IRR. The calculator is ideal for small businesses, entrepreneurs, and individual investors seeking a quick view of project liquidity.
When to use this calculator? In situations such as evaluating the purchase of equipment that generates savings, analyzing the viability of a new business, or comparing projects with different investment scales. Important caveats: ensure the annual cash flow is constant and realistic. If the cash flow varies, the simple payback will not be accurate. Also, payback should not be used as the sole decision criterion, as it ignores profitability after the investment is recovered.
For more reliable results, consider adjusting cash flow for inflation and risks. The calculator assumes all flows are equal, which rarely happens in practice. Therefore, use the result as an initial estimate and deepen the analysis with other financial tools. Remember: a shorter payback does not always mean a better investment, especially if the project has low long-term profitability.
Frequently asked questions
What is simple payback?
Simple payback is the time needed to recover the initial investment, calculated by dividing the investment by the constant annual cash flow.
Does this calculator consider the time value of money?
No, the simple payback ignores the time value of money. For that, use discounted payback, which discounts cash flows to present value.
Can I use payback to compare projects of different durations?
Yes, but with caution. Payback does not consider cash flows after the payback period, so projects with short payback may have low total profitability.
What if the cash flow is not constant?
If the cash flow varies, simple payback is not suitable. In that case, calculate payback by accumulating actual cash flows until the investment is recovered.
What is the main limitation of payback?
The main limitation is ignoring the time value of money and cash flows after the payback period, which can lead to suboptimal decisions.