How we calculate this
See methodology- Subtract the cost of investment from the gain to get net gain.
- Divide net gain by the cost of investment.
- Multiply by 100 to express ROI as a percentage.
ROI Calculator
ROI Calculator
Calculate return on investment from gain and cost.
Formula
Net gain
Gain from investment - Cost of investment ROI %
((Gain from investment - Cost of investment) / Cost of investment) × 100 Worked example
If an investment returns $15,000 and it cost $10,000, here is the result.
- Net gain is $15,000 - $10,000 = $5,000.
- ROI is $5,000 / $10,000 = 0.50.
- ROI is 50.00%.
Frequently Asked Questions
What does a negative ROI mean?
A negative ROI means the investment lost money relative to what it cost.
Can ROI be more than 100%?
Yes. An ROI above 100% means the net gain is larger than the original cost.
Why can cost of investment not be zero?
ROI divides by cost of investment, so a zero cost would make the percentage undefined.
Methodology and Trust Note
See full methodologyThese tools are designed to make the math visible, keep assumptions clear, and give you a practical planning result you can review quickly.
This calculator is for educational and planning purposes only. It does not replace professional financial, tax, accounting, or business advice.