Result
ROI
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This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.
How it is calculated
Profit = final value − amount invested. ROI = profit ÷ amount invested × 100% — the percentage that came back on top of what you put in, not the total cash you end up with.
ROI doesn't account for how long it took to get there: 30% in a month and 30% over three years are very different returns, even though the ROI figure is identical. That's why, when a period is given, the calculator also works out the annualized return — so investments of different lengths become directly comparable.
The annualized return is compound, not simple: annual rate = ((final value ÷ investment) ^ (12 ÷ months) − 1) × 100%. It isn't ROI divided by the number of years — linear division understates long investments and overstates short ones.