ROI Calculator
Return on Investment — net gain as % of cost.
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About this calculator
ROI expresses profit relative to what you put in, making wildly different investments comparable. Its weakness: it ignores time — 50% over 2 years beats 60% over 15. Pair ROI with the CAGR calculator when durations differ.
Formula
ROI = (Final − Cost) ÷ Cost × 100
Frequently Asked Questions
Can ROI be negative?
Yes — when the final value is below cost, ROI is negative and represents a loss.
Should transaction costs be included?
Ideally yes. Brokerage, taxes and fees belong in 'cost' so ROI reflects reality.