What is CAGR and why it matters
CAGR — Compound Annual Growth Rate — is the gold standard for measuring investment performance over time. It answers a simple question: at what steady annual rate did my investment grow from start to finish?
- Accounts for compounding — Unlike simple average, CAGR reflects your true return by accounting for the compounding effect
- Smooths volatility — Gives you a single annualized number that reflects steady equivalent growth, even if actual returns fluctuated wildly
- Universal comparison tool — Standard way to compare mutual funds, ETFs, stock portfolios, business revenue, and property values across different time periods
Worked example
If you invested $10,000 and it grew to $20,000 over 10 years, your CAGR is 7.18% — that is the constant annual rate that would have produced the same result.
The CAGR formula
Step-by-step calculation:
- Divide ending by beginning — $20,000 ÷ $10,000 = 2
- Take the exponent — 2^(1 ÷ 10) = 2^0.1 ≈ 1.0718
- Subtract 1 and convert to percentage — 1.0718 - 1 = 0.0718, or 7.18%
The formula solves for the steady annual rate that would produce the same ending value. If your investment doubled, you divide by 2; if it tripled, by 3. The exponent annualizes the result.
Why CAGR is better than simple average
A simple average of annual returns is misleading because it ignores compounding.
Example: Portfolio gains 50% one year and loses 50% the next.
| Metric | Calculation | Result |
|---|---|---|
| Simple average | (50 + (-50)) ÷ 2 | 0% (misleading) |
| Actual result | $10,000 → $15,000 → $7,500 | -25% overall |
| CAGR | Geometric mean | Negative (accurate) |
CAGR reflects the geometric mean, which compounds returns correctly, while simple average uses the arithmetic mean, which does not. Always use CAGR for multi-year investment returns.
Interpreting positive and negative CAGR
A positive CAGR means your investment grew; a negative CAGR means it shrank.
- 10% CAGR — Excellent. You are doubling your money roughly every 7 years.
- 5% CAGR — Solid and conservative.
- 15%+ CAGR — Exceptional, often indicates higher risk.
- Negative CAGR — You lost money annually. Example: $10,000 → $8,000 over 5 years = -4.3% CAGR.
CAGR gives you an honest picture, whether the news is good or bad.
Using CAGR to compare investments
CAGR lets you compare apples to apples even when time horizons differ.
Example: Fund A returned 60% over 3 years. Fund B returned 100% over 5 years. Which performed better?
| Fund | Total Return | Time | CAGR |
|---|---|---|---|
| Fund A | 60% | 3 years | 17% |
| Fund B | 100% | 5 years | 15% |
Fund A actually grew faster per year. Without CAGR, you would be misled by the larger absolute return. Use this calculator to measure your own portfolio's CAGR, then compare it to benchmarks like the S&P 500.
CAGR vs. ROI
CAGR and ROI measure different things:
- ROI (Return on Investment) — Total percentage gain or loss over the entire holding period. ROI = (Ending - Beginning) ÷ Beginning × 100%. Example: $10,000 → $20,000 = 100% ROI (you doubled your money).
- CAGR — Annualized return, accounting for compounding. Example: $10,000 → $20,000 over 10 years = 7.18% CAGR (per-year growth rate).
ROI is simple and useful for short periods; CAGR is essential for multi-year comparisons. Use our ROI Calculator to measure total return, then use this CAGR calculator to see the annualized equivalent.
Real-world applications of CAGR
- Company revenue — "Our revenue grew at a 15% CAGR over the past 5 years"
- Tech startups — User growth CAGR
- Real estate — Property value CAGR to compare markets
- SaaS companies — MRR (monthly recurring revenue) CAGR
- Economics — GDP growth, population growth, inflation-adjusted income over decades
Any time you need a single number to summarize long-term growth, CAGR is the answer.
Limitations of CAGR
CAGR assumes smooth, steady growth, which almost never happens in reality.
- Hides volatility — Your actual year-to-year returns will swing wildly (stocks crash, then recover; businesses have boom years and slow years). CAGR averages out all that volatility into a single line.
- Masks risk — A portfolio with a 10% CAGR might have swung from +30% to -20% along the way. If you need to understand risk, look at standard deviation or maximum drawdown alongside CAGR.
CAGR tells you where you ended up, but not how bumpy the journey was.
Cross-checking with compound interest
Once you calculate your CAGR, you can project it forward using our Compound Interest Calculator.
- CAGR is backward-looking — What rate did I earn?
- Compound interest is forward-looking — Where will this rate take me?
Example: If your portfolio has historically grown at 8% CAGR, plug 8% into the compound interest calculator to see where your current balance might grow over the next 10, 20, or 30 years. Together, they give you a complete picture of your financial trajectory.