What Is ROI?
ROI (Return on Investment) expresses gain or loss as a percentage of the original investment:
ROI = (Current Value − Cost of Investment) / Cost of Investment × 100
If you invested $10,000 and it's now $12,500:
ROI = (12,500 − 10,000) / 10,000 × 100 = 25%
ROI is simple to communicate and works across asset classes — stocks, real estate, business projects, and marketing campaigns.
ROI vs Annualized Return
Raw ROI doesn't tell you how long the investment took. A 25% ROI in 1 year is very different from 25% in 10 years.
| Metric | Use case |
|---|---|
| Total ROI | Whole-period gain |
| CAGR | Average annual compound growth over multiple years |
| Annualized ROI | Similar idea — normalize for time when comparing options |
For different time horizons, prefer CAGR or annualized metrics.
Include All Costs
For honest ROI, the denominator should include:
- •Purchase price + fees + commissions
- •Renovation or setup costs (real estate, business)
- •Opportunity cost is harder — rarely in simple ROI
Taxes on gains reduce net ROI — use after-tax numbers when comparing to tax-advantaged accounts.
Limitations of ROI
ROI doesn't capture:
- •Risk (two investments with same ROI can have wildly different volatility)
- •Time (unless annualized)
- •Non-financial benefits (brand, learning)
Use ROI alongside payback period, NPV, or IRR for business cases.
How to Use This ROI Calculator
Enter amount invested, gain or ending value, and optional fees. The tool shows ROI % and helps you compare deals quickly — remember to align time periods when comparing multiple investments.