Understanding ROI
Return on Investment (ROI) is the most widely used metric for evaluating investment profitability. It expresses profit as a percentage of the original investment cost, making it easy to compare different opportunities regardless of size.
ROI Formula
ROI = (Amount Returned − Amount Invested) / Amount Invested × 100
For example, if you invest $8,500 and receive $14,200 back, your ROI is ($14,200 − $8,500) / $8,500 × 100 = 67.06%.
ROI vs Annualized ROI
| Metric | What It Measures | Best For |
|---|---|---|
| ROI | Total return as % of cost | Single investment evaluation |
| Annualized ROI | Equivalent yearly return | Comparing investments of different durations |
A 100% ROI sounds great, but if it took 10 years, the annualized ROI is only 7.2%. Meanwhile, a 30% ROI in 1 year (30% annualized) is far more impressive. Always compare annualized returns when evaluating different investments.
Annualized ROI Formula
Annualized ROI = (1 + ROI)1/years − 1
This formula accounts for compound growth. Simply dividing ROI by years would understate returns for short periods and overstate them for long periods.
Typical Investment Returns
| Investment Type | Historical Annual Return | Risk Level |
|---|---|---|
| S&P 500 | ~10% | Moderate |
| Real Estate | 8-12% | Moderate |
| Bonds (US Treasury) | 4-6% | Low |
| High-Yield Savings | 4-5% | Very Low |
| Venture Capital | 15-25% | Very High |
Limitations of ROI
- Ignores time: Basic ROI doesn't account for how long money was invested — use annualized ROI instead
- Ignores risk: A 10% return from a savings account is very different from 10% in crypto
- Ignores cash flow timing: ROI assumes a single investment and return — for ongoing investments, use IRR
- Ignores taxes and fees: Real-world returns are reduced by capital gains tax, management fees, and transaction costs
- Ignores inflation: A 5% return with 3% inflation is only 2% in real purchasing power
Tips
- Always annualize: Compare investments on an annualized basis to account for different holding periods
- Include all costs: Factor in fees, taxes, maintenance, and opportunity costs for a true ROI
- Consider risk-adjusted returns: Higher ROI with higher risk isn't necessarily better
- Use dates for precision: The date mode calculates exact investment duration for more accurate annualization