How to use the ROI calculator
Enter the amount you invested and the final value it reached. The calculator shows your total return on investment as a percentage and your net profit in currency. Add an optional holding period in years to also see the annualized return, which puts investments of different lengths on a comparable footing.
ROI is only half the story without time
Return on investment is the simplest way to judge whether something paid off, but a percentage alone hides how long it took. Doubling your money is spectacular in a year and unremarkable over twenty. That is why serious comparisons use the annualized figure: it converts any total return into an equivalent yearly rate, so you can line up a quick trade against a long-term holding and see which genuinely performed better.
Making the numbers honest
The quality of an ROI figure depends on what you feed it. To avoid flattering yourself, fold buying costs and fees into the amount invested, and use the money you actually walked away with — after tax — as the final value. Done that way, ROI becomes a reliable yardstick for comparing opportunities rather than a number that only looks good on paper. All calculations run in your browser and nothing is stored.