ROI Calculator
A clear, practical calculator with instant results and an explained formula.
ROI Calculator
How to use this calculator
Enter the values and calculate. Adjust inputs to compare results.
ROI = gain ÷ initial investment × 100.
Informational estimate only. Verify important financial, health, engineering, or regulatory decisions with a qualified professional.
Return on investment compares gain with the magnitude of the initial investment: (final value − initial investment) ÷ |initial investment| × 100. An investment of 5,000 that ends at 5,750 has a 15% ROI. The percentage is easy to read, but it says nothing about how long the return took or how much risk was accepted.
A percentage needs a time period
A 15% result over one year is not equivalent to 15% over five years. For multi-period comparisons, use an annualized-return method and include the timing of contributions and withdrawals. Simple ROI is most useful when investments share a similar horizon and cash-flow pattern.
Include all relevant costs and proceeds
Transaction charges, maintenance, taxes, financing costs and additional capital can reduce the economic return. Likewise, income received before the final sale may belong in total proceeds. Define the scope consistently before comparing projects.
Compare like with like
Calculate ROI using the same valuation date and cost treatment for every option. Review the currency amount of gain alongside the percentage: a high percentage on a very small investment may contribute less total value than a lower percentage on a larger one.
Interpretation checklist
- Set a common start and end date.
- Include costs consistently.
- Separate simple ROI from annualized return.
- Consider risk and liquidity with the percentage.
Document the valuation source for the final value and the date on which it was measured. Unrealized estimates can be uncertain, particularly for private businesses or illiquid property. A transparent valuation range may be more informative than a single precise ROI percentage.
Where cash flows occur at different dates, use a time-weighted or money-weighted return measure alongside simple ROI for a fairer comparison.
Questions people ask about ROI Calculator
Does ROI include time?
No. This simple ROI formula does not annualize the result.
Can ROI be negative?
Yes. A final value below the initial investment produces a negative return.
Should income distributions be included?
Include them in final proceeds if the comparison is intended to measure total return.
Is the highest ROI always best?
No. Scale, risk, time, liquidity and uncertainty also matter.