Finance & Money
ROI Calculator
Return on investment %.
Educational estimates only. Not medical, legal, tax, or financial advice.
Guide: ROI Calculator
What it does
Converts profit or value change into an ROI percentage relative to cost.
How to use it
Enter cost basis and gain (or ending value minus cost), then calculate.
Formula
ROI = (Gain − Cost) ÷ Cost × 100%.
Example
Invest $1,000, sell for $1,250 → ROI = 25%.
FAQs
Does ROI include time?
Basic ROI does not; annualized return divides by holding period.
What about fees?
Include transaction costs in cost basis for realistic ROI.
Can ROI be negative?
Yes—if you lose money versus cost, ROI is negative.