ROI Calculator

Formula and method

This calculator applies the following established relationship to the values you enter. Keep units consistent unless the fields specify otherwise.

ROI = (gain − cost) ÷ cost × 100

How to use it

Replace the sample values with your own. The result updates instantly in your browser. For consequential decisions, independently verify critical inputs and consult a qualified professional when appropriate.

Accuracy and sources

Conversion factors use international unit definitions. Formula-based tools state their equation above so results can be checked independently. Rounding affects display only; calculations use full browser precision.