Annualized Total Return Formula and Calculation

What Is Annualized Total Return?

An annualized total return is the geometric average amount of money an investment earns each year over a given period. The annualized return formula is calculated as a geometric average to show what an investor would earn over some time if the annual return were compounded.

An annualized total return provides only a snapshot of an investment's performance and does not give investors any indication of its volatility or price fluctuations.

Understanding Annualized Total Return

To understand what annualized total return is, it helps to compare the hypothetical performances of two mutual funds. Below is the annualized rate of return over a five-year period for two funds:

• Mutual Fund A Returns: 3%, 7%, 5%, 12%, and 1%
• Mutual Fund B Returns: 4%, 6%, 5%, 6%, and 6.7%

Both mutual funds have an annualized rate of return of 5.5%, but Mutual Fund A is much more volatile. Its standard deviation is 4.2%, while Mutual Fund B's standard deviation is only 1%. Even when analyzing an investment's annualized return, it is important to review risk statistics.

Annualized Return Formula and Calculation

The formula to calculate the annualized rate of return needs only two variables: the returns for a given period of time and the time the investment was held. The formula is:

$\begin{aligned} \text{Annualized Return} = &\big ( (1 + r_1 ) \times (1 + r_2) \times (1 + r_3) \times \\ &\dots \times (1 + r_n) \big ) ^ \frac{1}{n} - 1 \\ \end{aligned}$Annualized Return=​((1+r1​)×(1+r2​)×(1+r3​)×⋯×(1+rn​))n1​−1​

For example, take the annual rates of returns of Mutual Fund A above. An analyst substitutes each " r " variable with the appropriate return and "n" with the number of years the investment was held. In this case, five years. The annualized return of Mutual Fund A is calculated as:

$\begin{aligned} \text{Annualized Return} &= \big ( (1 + .03) \times (1 + .07) \times (1 + .05) \times \\ &\quad \quad (1 + .12) \times (1 + .01) \big ) ^ \frac{1}{5} -1 \\ &= 1.309 ^ {0.20} - 1 \\ &= 1.0553 - 1 \\ &= .0553, \text{or } 5.53\% \\ \end{aligned}$Annualized Return​=((1+.03)×(1+.07)×(1+.05)×(1+.12)×(1+.01))51​−1=1.3090.20−1=1.0553−1=.0553,or 5.53%​

An annualized return does not have to be limited to yearly returns. If an investor has a cumulative return for a given period, even if it is a specific number of days, an annualized performance figure can be calculated; however, the annual return formula must be slightly adjusted to:

$\begin{aligned} &\text{Annualized Return} = ( 1 + \text{Cumulative Return} ) ^ \frac {365}{ \text{Days Held} } - 1 \\ \end{aligned}$​Annualized Return=(1+Cumulative Return)Days Held365​−1​

For example, assume a mutual fund was held by an investor for 575 days and earned a cumulative return of 23.74%. The annualized rate of return would be:

$\begin{aligned} \text{Annualized Return} &= ( 1 + .2374) ^ \frac{365}{575} - 1 \\ &= 1.145 - 1 \\ &= .145, \text{or } 14.5\% \\ \end{aligned}$Annualized Return​=(1+.2374)575365​−1=1.145−1=.145,or 14.5%​

Difference Between Annualized Return and Average Return

Calculations of simple averages only work when numbers are independent of each other. The annualized return is used because the amount of investment lost or gained in a given year is interdependent with the amount from the other years under consideration because of compounding.

For example, if a mutual fund manager loses half of her client's money, she has to make a 100% return to break even. Using the more accurate annualized return also gives a clearer picture when comparing mutual funds or the return of stocks that have traded over different periods. 

Reporting Annualized Return

According to the Global Investment Performance Standards (GIPS)—a set of standardized, industry-wide principles that guide the ethics of performance reporting—any investment that does not have a track record of at least 365 days cannot "ratchet up" its performance to be annualized.

Thus, if a fund has been operating for only six months and earned 5%, it is not allowed to say its annualized performance is approximately 10% since that is predicting future performance instead of stating facts from the past. In other words, calculating an annualized rate of return must be based on historical numbers.

The Bottom Line

Annualized total return represents the geometric average amount that an investment has earned each year over a specific period. By calculating a geometric average, the annualized total return formula accounts for compounding when depicting the yearly earnings the investment would generate over the holding period. While the metric provides a useful snapshot of an investment's performance, it does not reveal volatility and price fluctuations.