Return on Investment (ROI) Calculator
Measure how much an investment gained or lost as a percentage of what you put in.
What ROI tells you
ROI expresses profit relative to cost: ROI = (final − initial) / initial × 100. It is simple and universal, which makes it great for quick comparisons across very different investments — a marketing campaign, a stock, a rental property.
Its blind spot: time
ROI ignores how long the return took. A 50% ROI over one year is very different from 50% over ten. For time-adjusted comparisons, pair ROI with the CAGR calculator.
Frequently asked questions
Does ROI include time?
No. ROI is a single-period figure. Use CAGR when you need an annualized, time-adjusted return.