Finance · 5 min read · November 14, 2024

CAGR: The Only Investment Return Metric That Matters

When an investment fund says it returned 87% over five years, should you be impressed? What if another fund returned 12% in one year? Which performed better? Without CAGR, you cannot honestly compare them. Here is why every investor needs to understand this metric.

What Is CAGR?

CAGR stands for Compound Annual Growth Rate. It is the rate at which an investment would have grown if it grew at the same steady rate every year — smoothing out all the volatility to reveal the underlying growth trend.

A 5-year CAGR of 15% does not mean the investment returned exactly 15% each year. It means that if it had grown at a constant 15% annually, it would have produced the same final result as it actually did through its volatile ups and downs.

The CAGR Formula

CAGR = (Final Value / Initial Value) ^ (1/n) − 1

Where n = number of years

Worked Example

You invested $10,000 in a mutual fund in 2019. By 2024 (5 years later), it is worth $21,500.

CAGR = (21,500 / 10,000) ^ (1/5) − 1

CAGR = (2.15) ^ 0.2 − 1

CAGR = 1.1653 − 1

CAGR = 16.53% per year

Why Absolute Returns Are Misleading

Consider two investments:

Fund A

Investment: $10,000
Final value: $18,700
Holding period: 3 years
Absolute return: 87%
CAGR: 23.3% per year

Fund B

Investment: $10,000
Final value: $18,700
Holding period: 7 years
Absolute return: 87%
CAGR: 9.4% per year

Both funds returned 87% in absolute terms. But Fund A's CAGR of 23.3% is dramatically better than Fund B's 9.4% — because Fund A achieved the same result in less than half the time. CAGR reveals this; absolute return hides it.

Historical CAGRs to Know

S&P 500 (100yr avg)

~10%

Global stocks (50yr)

~8-9%

US Real Estate (50yr)

~5-6%

Gold (50yr)

~7-8%

Savings account (2024)

~4-5%

Inflation (US, 50yr avg)

~3.5%

Limitations of CAGR

CAGR is excellent for comparing performance but has two significant limitations you should know:

It hides volatility. A fund could have crashed 40% in year 2 and recovered, ending with the same CAGR as a smooth grower. Sequence of returns risk matters, especially near retirement.
It does not account for additional contributions. CAGR is for a single lump sum investment. For regular (SIP) investments, you need XIRR (Extended Internal Rate of Return).

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