Complete guide
ROI Calculator: formula, worked example and interpretation
Calculate total and annualized return on investment from cost, ending value, income and time held. Enter the known values and the result updates instantly with an auditable breakdown.
What the ROI Calculator answers
Calculate total and annualized return on investment from cost, ending value, income and time held.
Use the breakdown to compare the result with the source values before making a decision.
Formula and variables
The calculation uses ROI=(ending+income−cost)/cost; annualized=(total multiple)^(1/years)−1. Every variable comes directly from a labeled field.
ROI=(ending+income−cost)/cost; annualized=(total multiple)^(1/years)−1Worked example
$10,000 growing to $13,000 with $500 income has a 35% total ROI.
Changing any field recalculates the result immediately, so nearby scenarios can be compared without reloading the page.
How to use the result
Treat the result as a planning value and compare it with the detailed rows shown beside it.
Keep units and time periods consistent. Use the share or PDF action to preserve the exact assumptions.
Assumptions and scope
Cash-flow timing, taxes, fees, inflation and risk are not captured by a single beginning/end ROI.
The calculator exposes its assumptions instead of filling missing facts with hidden estimates.
Accuracy checks
Confirm the units, dates, rates and source figures before relying on the output.
Round only the displayed answer; Calculator24 keeps full JavaScript precision for intermediate arithmetic and exported values.
Input and output checklist
| Item | What to enter or review |
|---|---|
| Inputs | Initial cost ($), Ending value ($), Income received ($), Holding period (years) |
| Equation | ROI=(ending+income−cost)/cost; annualized=(total multiple)^(1/years)−1 |
| Example | $10,000 growing to $13,000 with $500 income has a 35% total ROI. |
| Limit | Cash-flow timing, taxes, fees, inflation and risk are not captured by a single beginning/end ROI. |
Frequently asked questions
What does this ROI Calculator calculate?
Calculate total and annualized return on investment from cost, ending value, income and time held.
Which formula does it use?
ROI=(ending+income−cost)/cost; annualized=(total multiple)^(1/years)−1
Does the result update while I type?
Yes. Valid changes recalculate after a short delay and the previous result is not substituted for invalid input.
Which assumptions should I check?
Check units, rates, dates and every source value shown in the form.
Is the result exact?
Cash-flow timing, taxes, fees, inflation and risk are not captured by a single beginning/end ROI.
Can I save or share the calculation?
Yes. Copy, Share, WhatsApp, PDF/Print, CSV, comparison and parameterized-link actions are available.
What to keep in mind
Cash-flow timing, taxes, fees, inflation and risk are not captured by a single beginning/end ROI.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.