Finance & Business Tools
ROI Calculator
Calculate Return on Investment (ROI) percentage, net gain, and annualized ROI.
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What is ROI?
ROI measures investment efficiency: (gain - cost) / cost x 100. Annualized ROI accounts for investment duration.
How it works
We compute ROI% = (final value - initial) / initial x 100. Annualized ROI = ((1 + ROI%)^(1/years) - 1) x 100.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.