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·2 min read

What Is CAGR? How to Measure Average Annual Investment Performance

CAGR is the compound annual growth rate — a smooth way to measure investment performance over time. We explain how it works, why it beats simple average returns, and the limitations to know.

CAGRPerformanceInvestingKnowledge

"How much did this earn per year?"

When evaluating an investment over many years, you need a number that answers: on average, how much did it grow each year? The accurate answer is not the simple arithmetic average return — it is CAGR.

What CAGR is

CAGR (Compound Annual Growth Rate) is the steady annual growth rate needed to take a value from its starting point to its ending point, accounting for the effect of compounding.

In other words, CAGR "smooths" a bumpy journey into a single number: "if this asset grew steadily at X% per year, it would go from the start value to the end value."

Why CAGR beats the simple average return

This is the most important point. The simple arithmetic average can be seriously misleading because it ignores compounding and the impact of losses.

A classic example: an investment that rises 50% in year 1 and falls 50% in year 2.

  • Arithmetic average: (50% − 50%) / 2 = 0%. Sounds like break-even.
  • Reality: 100 → 150 (up 50%) → 75 (down 50%). You have 75, i.e., a 25% loss.

CAGR reflects this reality accurately (negative), while the arithmetic average fools you into thinking break-even. This is why CAGR is a more honest measure of multi-year performance.

How to use CAGR

CAGR is especially useful to:

  • Compare investments with different time spans on the same "per year" measure.
  • Set realistic expectations: knowing how much an asset grows per year on average helps you plan sensibly.
  • Assess long-term performance instead of being fooled by one outlier year.

You do not need to calculate it by hand — many tools and spreadsheets have a CAGR function. What matters is understanding what it means to interpret it correctly.

Limitations to remember

CAGR is powerful but not perfect:

  • Hides volatility: CAGR smooths the journey, so two investments with the same CAGR can have very different volatility. One is smooth, one swings wildly. Combine CAGR with a risk measure like the Sharpe ratio or beta.
  • Based on the past: past CAGR does not guarantee the future.
  • Sensitive to start/end points: different time periods give different CAGRs.

Conclusion

CAGR is the compound annual growth rate — a more honest performance measure than the simple average because it accounts for compounding and the impact of losses. Use it to compare and set realistic expectations, but remember it hides volatility — always consider risk alongside it.

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