Calculator
Return on investment calculator
Calculate simple ROI and the absolute amount gained or lost. Data is processed only in your browser, and the page explains the formula and limitations of the result.
Reviewed: 3 August 2026Processed locally
Calculator
Enter data
The initial investment cost and final value. Fields marked with an asterisk are required.
How to use the calculator
- Enter the required data: the initial investment cost and final value.
- Check the values and select “Calculate”.
- Review the primary result and the detailed calculation components.
Calculation details
Formula and calculation method
ROI = (final value − investment cost) ÷ investment cost × 100%.
Worked example
A PLN 10,000 cost and PLN 12,500 final value mean a PLN 2,500 gain and ROI of 25%.
Limitations
- Simple ROI excludes time, intermediate cash flows, risk, inflation, tax and the cost of capital.
Sources
Engine version: 1.0 · Last reviewed: 3 August 2026
Frequently asked questions
Is the entered data sent to a server?
No. The calculation runs locally in your browser and the values are not saved by default.
Is the result definitive?
Not always. Simple ROI excludes time, intermediate cash flows, risk, inflation, tax and the cost of capital.