ROI Calculator
Measure return on investment and compare the gain with the original investment cost. Free, instant and mobile-friendly.
Enter your numbers
Formula
ROI = (Return − Investment cost) ÷ Investment cost × 100
How to use this result
Use the result to compare scenarios, set targets and identify the number that most affects your decision. Recalculate when prices, costs, customer volume or campaign performance change.
This calculator provides an estimate based on your inputs and is not accounting, tax, legal or investment advice.
Understand your ROI Calculator result
Return on investment compares net gain with the amount invested. It provides a quick percentage for comparing campaigns, equipment, software or other business projects.
Worked example
An investment costing €10,000 that returns €18,000 creates an €8,000 net gain and an 80% ROI. The time required to earn that return still matters.
How to interpret it
Positive ROI means the recorded return exceeds cost, but it does not automatically mean the project is best. Consider timing, risk, financing, maintenance and alternative uses of capital.
Practical next steps
- Use the same time period for every option compared.
- Include setup, labour and ongoing costs.
- Pair ROI with payback period and cash-flow analysis.
Questions to ask before deciding
Are all relevant costs included? Is the time period consistent? How would the result change if volume, price or cost moved by 10%? Save your assumptions so you can compare the estimate with actual performance later.