When to use it
Use it when you need a clear result without building a manual formula or spreadsheet.
Instant calculator
ROI Calculator
Calculate return on investment from cost and return, with context on time period, risk, and limits of simple ROI.
FreeInstant calculator
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Input data
Enter the required values, then run the tool.OUTPUT
Result
Ready◇Your result will appear here
Complete the form and run the tool to see the result.
Usage guide
Use the tool with confidence
Enter the required data, review the result, then copy or export it as an image or PDF depending on the tool.How it works
Enter values, run the tool, then review the result and supporting details.
Note
Review the figures and context before making financial or business decisions.
Return on investment
ROI is a simple measure that compares net return with investment cost. It is useful for an initial comparison when the same definitions of cost and return are used consistently.
Inputs and field meanings
Review these values before running the tool. The labels below come from the actual form so the guidance matches what you will use on this page.
- Return value: required, minimum 0.
- Investment: required, minimum 1e-8.
ROI formula
Net return = final value or return - investment cost.
ROI % = net return ÷ investment cost × 100. This basic formula does not automatically adjust for different time periods, risk, or interim cash flows.
Simple investment example
A cost of 500 and final return of 650 gives a net return of 150, so ROI = 150 ÷ 500 × 100 = 30%.
Before comparing two results
- Use the same time period when possible.
- Treat direct costs and fees consistently between alternatives.
- A high ROI number by itself does not describe risk, liquidity, or timing of cash flows.
ROI questions
Is ROI automatically an annual rate?
No. A simple ROI does not annualize the result, so the investment period matters.
Can ROI be negative?
Yes. It is negative when the final return is lower than the cost entered.
Is ROI enough for an investment decision?
No. Risk, duration, liquidity, cash flows, and other measures may also matter.