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# ROI calculator

Measure an investment's return as a percentage and net gain, with an annualized rate when you add the holding period in years.

Enter what went in and what came out.

ROI is (final value minus amount invested) divided by amount invested, so the same number can describe a two-week flip and a nine-year hold; only the annualized figure makes different holding periods comparable, and it compounds geometrically: (final over initial) to the power of one over years, minus one. The annualized figure is a rate per year, not a promise of the rate in any one year. This is arithmetic, not financial advice; it says nothing about risk, inflation, or what an alternative investment would have done.
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## More unit & math tools

- [Average and median](/converters/statistics)
- [Unit converter](/converters/units)
[All unit & math tools](/converters)

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