Understanding CAGR: How to Measure Investment Returns

When an investment grows from one value to another over several years, looking only at the total return does not tell the complete story.

The Compound Annual Growth Rate (CAGR) converts that growth into an annualized rate, making it easier to compare investments held for different periods.

What is CAGR?

CAGR represents the constant annual growth rate that would take an investment from its starting value to its ending value over a specific period.

It is particularly useful when analyzing stocks, businesses, mutual funds, and other investments over multiple years.

CAGR Formula

The basic CAGR formula is:

CAGR = (Ending Value / Beginning Value)^(1 / Number of Years) - 1

For example, suppose an investment grows from ₹1,00,000 to ₹1,50,000 over 5 years.

The CAGR tells us the approximate annualized rate at which the investment would have needed to grow to reach ₹1,50,000.

Why CAGR is useful

CAGR can help investors:

• Compare investments with different holding periods
• Understand long-term growth rates
• Analyze historical business or stock performance
• Compare revenue or profit growth
• Evaluate investment performance over time

Important limitation

CAGR assumes a smooth annualized growth rate.

Real investments rarely grow at exactly the same rate every year. A stock might rise significantly in one year and decline in another.

Therefore, CAGR should be viewed as an annualized summary of the overall growth, rather than the actual return achieved in every individual year.

Example

Consider an investment with:

Year	Investment Value
0	₹1,00,000
1	₹1,08,000
2	₹1,17,000
3	₹1,28,000
4	₹1,39,000
5	₹1,50,000

The investment increased from ₹1 lakh to ₹1.5 lakh during the five-year period.

CAGR converts this entire growth into a single annualized percentage.

Try the VolumeCall CAGR Calculator

You can use the VolumeCall CAGR calculator to calculate annualized returns using your own investment values.

Stock Research Example

CAGR can also be useful when studying the long-term growth of an individual company.

When using CAGR for company analysis, investors may examine revenue CAGR, profit CAGR, EPS CAGR, or stock-price CAGR depending on the objective.

CAGR vs Absolute Return

These two measures answer different questions.

Metric	What it tells you
Absolute Return	Total percentage gain or loss
CAGR	Annualized growth rate over the investment period

For example, an investment could generate a large absolute return over ten years but have a relatively modest CAGR because the growth occurred over a long period.

Conclusion

CAGR is a simple way to convert multi-year growth into an annualized rate.

It is especially useful for comparing long-term investment performance, business growth, and financial metrics.

However, CAGR should not be used in isolation. Investors should combine it with other financial and valuation measures before making investment decisions.