Glossary term
Average Return
Average return summarizes investment returns over multiple periods, often as a simple average or compound annual rate.
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What Is Average Return?
Average return is a summary measure of investment performance over multiple periods. The phrase can mean different things depending on the calculation. Sometimes it means the arithmetic average of periodic returns. Other times, people use it loosely to describe an annualized or compound average return.
That distinction matters. A simple average return can make performance look smoother than the investor's actual compound result. Annualized return, also called compound annual growth rate in some contexts, shows the steady yearly rate that would produce the same beginning-to-ending value.
Key Takeaways
- Average return is a broad term, so the calculation should be identified.
- Arithmetic average return adds periodic returns and divides by the number of periods.
- Geometric or annualized return reflects compounding across periods.
- Volatility can make the simple average higher than the compound result.
- Cash flows, fees, taxes, and timing can change an investor's personal return.
How Average Return Works
The simplest version adds returns from each period and divides by the number of periods. If a portfolio returns 12%, 4%, and -1% over three years, the arithmetic average is 5%. That is useful for describing the average year in the sample.
But if the goal is to understand how wealth grew, compounding matters. A loss changes the base for the next gain, and a gain changes the base for the next loss. The geometric average or annualized return usually gives a better picture of long-term growth.
Simple Average Return Formula
Return1 through Returnn are the returns for each period. n is the number of periods. This formula gives each period equal weight and does not compound returns.
Average Return Versus Related Measures
Measure | What it shows | Best use |
|---|---|---|
Arithmetic average return | Simple average of periodic returns | Describing the average period |
Annualized return | Compound yearly growth rate | Comparing multi-year performance |
Total return | Full gain or loss over the holding period | Showing the overall outcome |
Money-weighted return | Return affected by cash-flow timing | Measuring an investor's personal experience |
Why It Matters
Average return is common in fund materials, retirement projections, and market-history discussions. It can help frame expectations, compare strategies, and communicate performance simply.
The risk is that the simple version can overstate what investors actually earn over time. A portfolio that gains 50% one year and loses 50% the next has a simple average return of 0%, but the investment is down 25% from where it started. That is why the calculation behind the phrase matters.
Limits and Misunderstandings
Average return does not show volatility, drawdowns, sequence risk, or the timing of gains and losses. Two investments can have the same average return and very different investor experiences.
It also does not automatically include fees, taxes, or investor cash flows. Published fund returns and personal account returns can differ because contributions, withdrawals, and reinvestment timing change the investor's result.
The Bottom Line
Average return can be useful, but only when the method is clear. For long-term investment growth, annualized or compound return is usually more informative than a simple arithmetic average.