ROI Calculator
Calculate return on investment (ROI) as a percentage from cost and gain. ROI = (gain − cost) ÷ cost × 100. — free, fast and private.
Your ROI will appear here.
Example: $1,000 cost and $1,500 gain → ROI = (1500 − 1000) ÷ 1000 × 100 = 50%.
How to use ROI Calculator
- Enter the total cost of the investment.
- Enter the total amount gained (final value).
- Click Calculate to see your ROI percentage and net profit.
- A positive ROI means a profit; a negative ROI means a loss.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
What is a good ROI?
It depends on the investment. Stock markets have historically averaged about 7–10% a year; a business project often targets 15% or more. Always compare ROI over the same time period.
What is the ROI formula?
ROI = (gain − cost) ÷ cost × 100. For example, $1,000 cost and $1,500 gain gives ($1,500 − $1,000) ÷ $1,000 × 100 = 50%.
Can ROI be negative?
Yes. If the gain is less than the cost, ROI is negative — you lost money.
Is my data uploaded anywhere?
No. All calculations run in your browser and your numbers are never sent to a server.