ROI Calculator

How the ROI calculator works

This free return on investment calculator works out your ROI for businesses worldwide, plus an annualized figure if you know the time period. ROI is one of the simplest ways to compare very different investments on equal footing.

1. Enter the amount you invested.
2. Enter the amount you got back (the final value, not just the profit).
3. Optionally add the investment period in months to see an annualized ROI.
4. Results update instantly as you type.

Why annualized ROI matters for comparing investments

A 20% ROI over one month is a very different result from a 20% ROI over three years, but plain ROI doesn’t show that difference. An annualized ROI calculator converts any return into a standardized yearly rate, making it possible to fairly compare investments held for different lengths of time. Once you know the ROI calculation formula, the annualized version is just one extra step.

Why ROI alone doesn’t tell the whole story

Per Investopedia’s overview of return on investment, ROI measures return relative to cost, but it says nothing about risk or how long the money was tied up — a high ROI over five years can be a worse outcome than a modest ROI over six months, depending on what else that capital could have done.

Using ROI to compare, not just to report

ROI is most useful when it’s used to compare two or more options against each other, not just reported as a single number after the fact. Calculating it before committing to a decision — not only afterward — is what actually helps with better allocation of limited capital.

Accounting for costs beyond the initial investment

The “amount invested” in an ROI calculation should include ongoing costs tied to the investment, not just the upfront number — a marketing campaign’s ROI, for example, should account for the team’s time, not just ad spend, or the result will look better than it actually was.

Being cautious with projected, not actual, returns

An ROI calculated from projected future returns carries more uncertainty than one calculated from results that have already happened. Labeling projected ROI clearly as an estimate, rather than presenting it with the same confidence as historical ROI, avoids overstating what’s actually known.

When two options have similar ROI, the one with the shorter payback period is often the safer choice, since it carries less exposure to things changing before the return is realized.

Frequently asked questions

For background on evaluating business investments, see Mi Gazette’s press and media services.