What the result means
ROI divides net gain by the original investment and expresses the relationship as a percentage. It is a compact comparison measure, but it does not show how long the return took or how risky it was.
Business
ROI Calculator
Measure the return and net gain on an investment.
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How this calculation works
Measure the return and net gain on an investment. Enter the initial investment and final value to calculate net gain and return as a percentage of the initial cost.
Formula used
ROI = (final value − initial investment) ÷ initial investment × 100
Good to know
Results are estimates for informational purposes.
Example calculation
(€6,500 − €5,000) ÷ €5,000 × 100 = 30%
A practical accuracy check
Subtract initial investment before dividing by it. Equal initial and final values give 0% ROI; a zero final value gives −100%, before omitted costs or income.
Assumptions and limits
Define cost and return consistently. Omitting maintenance, labor, transaction fees, taxes or opportunity cost can overstate ROI, while comparing projects with different durations can be misleading.
Using the result responsibly
Report ROI with the measurement period, cash-flow definition and major excluded costs. For multi-year decisions, supplement it with annualized return, payback time and scenario analysis.
A relevant comparison to try
Compare investments over the same period with costs treated consistently. This ROI is not annualized and omits cash-flow timing, risk, tax and inflation.
How to use this calculator
- Enter the initial investment and final value to calculate net gain and return as a percentage of the initial cost.
- Check units and time periods before comparing two results.
- Change one input at a time to understand its effect.
Frequently asked questions
What does the ROI Calculator calculate?
Measure the return and net gain on an investment. The result is calculated from the values you enter and the formula shown on this page.
Which assumptions does the ROI Calculator use?
It applies ROI = (final value − initial investment) ÷ initial investment × 100. Values, fees, rules or timing not represented by an input are not added automatically.