ROI Calculator
Work out return on investment from gain and cost.
Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.
ROI Calculator
How to use this tool
- Enter the total gain or return from the investment.
- Enter the total cost of the investment.
- Press Generate to see profit and ROI percentage.
Worked example
With a gain of 15000 and a cost of 10000, profit is 15000 - 10000 = 5000, and ROI is 5000 / 10000 x 100 = 50%.
What this tool does not do / Limits
This is an estimate, not financial advice. It ignores timing, taxes, fees, inflation and risk, and it treats all gains and costs as if they happened at once.
Frequently asked questions
What does a negative ROI mean?
It means the total gain was less than the total cost, so the investment lost money on these numbers.
Can I compare ROIs over different time periods?
Only with care: a 50% return over one year is very different from 50% over ten years, which this simple formula does not show.
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