How it works
Gain = returned value − investment. ROI = gain ÷ investment × 100. Simple annualized ROI = ROI × 12 ÷ months.
Worked example
A 1,000 investment returning 1,200 has a 200 gain and 20% ROI over 12 months.
Edge cases and limitations
Inputs must be finite. Negative values are accepted only where they represent a meaningful loss or cash outflow. Rounding is display-only, and results are not tax, legal, accounting, investment, or financial advice.
Frequently asked questions
What does annualized ROI assume?
It is a simple time-scaled comparison and does not model compounding, risk, tax, or suitability.
Is my data sent anywhere?
No. Calculations run locally in the browser and do not require customer data, persistence, or transmission.
Formula context: Investor.gov annual return glossary.
No personal data is required, stored, or transmitted.