About the ROI Calculator
A return on investment calculator finds both the total percentage gain and the annualised return on an investment. ROI is the most widely used profitability measure in business precisely because it is simple — which is also its main weakness.
The formula
ROI = (return − invested) / invested · 100; Annualised = (return/invested)^(1/years) − 1Total ROI is the percentage gain over the whole holding period. Annualised ROI converts that into a per-year figure, which is what makes different investments comparable.
How to use this calculator
- 1Enter your Amount Invested ($). The field starts at
10000, which you can overwrite. - 2Enter your Final Value / Return ($). The field starts at
14500, which you can overwrite. - 3Enter your Holding Period (Years). The field starts at
3, 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 |
|---|---|
| Amount Invested ($) | 10000 |
| Final Value / Return ($) | 14500 |
| Holding Period (Years) | 3 |
Result
Net Gain: $4,500.00
ROI: 45.00%
Annualized ROI: 13.19%
Return Multiple: 1.45x
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
Total ROI without a time period is close to meaningless. A 45 percent return is excellent over one year and mediocre over ten, and the annualised figure is what exposes the difference — 45 percent over three years is about 13.2 percent per year.
ROI also ignores risk entirely, which is why it should never be the sole criterion. A 20 percent return from a diversified index fund and a 20 percent return from a single speculative position are the same number describing very different decisions. Risk-adjusted measures such as the Sharpe ratio exist for this reason.
Things worth knowing
- Always annualise before comparing investments with different holding periods.
- Include all costs — fees, commissions, taxes, and time — in the invested amount, or ROI is overstated.
- ROI says nothing about risk. Two identical returns can represent very different exposures.
- For projects with cash flows at multiple points, IRR or NPV is more appropriate than simple ROI.
- Opportunity cost matters. A positive ROI that underperforms an index fund is a poor result.
Frequently asked questions
How do I calculate ROI?+
Subtract what you invested from what you got back, divide by the amount invested, and multiply by 100. Turning 10,000 into 14,500 is a 45 percent total ROI.
What is the difference between total and annualised ROI?+
Total ROI is the gain over the entire period; annualised ROI expresses it as a yearly rate. A 45 percent gain over three years is only about 13.2 percent per year, which is the comparable figure.
What counts as a good ROI?+
It depends on risk and alternatives. Beating a broad index fund at 7 to 10 percent annually is a reasonable benchmark for investments; business projects often require considerably more to justify the risk.
What are ROI's limitations?+
It ignores risk, timing of cash flows, and often hidden costs. It also cannot compare projects of different durations without annualising, and it says nothing about the scale of the gain in absolute terms.