Sharpe Ratio vs Sortino Ratio: The Key Differences and Similarities

Investors often use various ratios and metrics to measure the performance of their portfolios. Two commonly used metrics are the Sharpe ratio and the Sortino ratio. These ratios allow investors to gauge the return they are receiving relative to the risk they are taking on.

The Sharpe ratio was developed by Nobel laureate William F. Sharpe in 1966. It measures the excess return of an investment compared to a risk-free investment, relative to the volatility of the investment. The higher the Sharpe ratio, the better the investment is considered to be.

On the other hand, the Sortino ratio, developed by Frank A. Sortino, is a variation of the Sharpe ratio that only takes into account the downside risk of an investment. This ratio considers only the volatility that falls below a certain threshold, which is typically the minimum acceptable return or target return. This makes it a more specific measure of risk compared to the Sharpe ratio.

While both ratios provide valuable insights into portfolio performance, it’s important to understand the differences between them and which one may be more appropriate depending on the investor’s goals and risk tolerance. In this article, we’ll dive deeper into the Sharpe ratio and the Sortino ratio, discussing their calculations, pros, cons, and how they differ from one another.

What Is The Sharpe Ratio?

The Sharpe ratio is a widely used measure of risk-adjusted performance in the world of finance. It was developed by Nobel laureate William F. Sharpe in 1966, and since then has become a standard tool for evaluating investment performance. The Sharpe ratio measures the excess return of an investment relative to the risk-free rate of return, per unit of volatility.

Calculate The Sharpe Ratio: Sharpe Ratio Formula

The basic formula for the Sharpe ratio is:

Sharpe ratio = (Rp – Rf) / σp

where:

Rp = return of the portfolio

Rf = risk-free rate of return

σp = standard deviation of the portfolio’s excess returns

The Sharpe ratio essentially measures the return on investment that is attributable to the amount of risk taken on, relative to a risk-free investment such as a government bond. It helps investors assess whether the excess return of an investment is due to good management or simply taking on more risk. The higher the Sharpe ratio, the better the investment is considered to be.

A Sharpe ratio of 1 or higher is generally considered to be good, while a ratio of 2 or higher is considered to be very good. However, the Sharpe ratio is not without its limitations. For instance, it assumes that returns are normally distributed, which is often not the case in reality.

Despite its limitations, the Sharpe ratio is still widely used by investors and fund managers around the world as a key tool for evaluating investment performance. However, in recent years, alternative measures such as the Sortino ratio have gained popularity as well. The Sortino ratio is similar to the Sharpe ratio, but focuses specifically on downside risk, rather than overall volatility. In the next section, we will discuss the Sortino ratio in more detail and compare it to the Sharpe ratio.

What Is The Sortino Ratio?

The Sortino Ratio is a financial metric that measures the risk-adjusted returns of an investment portfolio or an individual security. It is named after Frank A. Sortino, a professor of finance at the University of San Francisco, who developed the ratio in 1980s as an improvement to the Sharpe Ratio.

While the Sharpe Ratio considers both the return and volatility of an investment, the Sortino Ratio takes into account only the downside volatility or the deviation of returns below a certain threshold, usually the minimum acceptable return or the risk-free rate. In other words, the Sortino Ratio focuses on the risk of not achieving a certain target return, rather than the risk of achieving negative returns in general.

The formula for the Sortino Ratio is similar to the Sharpe Ratio, but instead of using the standard deviation of returns as the denominator, it uses the downside deviation, which is calculated by squaring the difference between the returns below the threshold and the threshold itself, summing them up, and dividing by the number of observations. The Sortino Ratio is then obtained by dividing the excess return (i.e., the return above the threshold) by the downside deviation.

The Sortino Ratio is expressed as a single number, which indicates the amount of excess return per unit of downside deviation. The higher the Sortino Ratio, the better the risk-adjusted performance of the investment, as it implies that the investment generated more return for the same amount of downside risk.

Like the Sharpe Ratio, the Sortino Ratio is not without limitations. It relies on historical data, which may not be a reliable indicator of future performance, and it assumes a normal distribution of returns, which may not hold true for all types of investments. Additionally, the choice of the threshold or minimum acceptable return is subjective and can significantly affect the Sortino Ratio.

Overall, the Sortino Ratio is a useful tool for investors who are concerned with minimizing downside risk and achieving a certain target return. It complements the Sharpe Ratio and other risk-adjusted measures by providing a more nuanced view of the risk-return tradeoff.

source: The Diary of a Trader on YouTube

Clear Examples Of Sharpe Ratio

Here are some examples of how the Sharpe Ratio can be used in practice:

Example 1: Investment Fund A

Suppose we have an investment fund, Fund A, which has an average annual return of 12% and a standard deviation of returns of 10%. We also assume the risk-free rate is 3%. To calculate the Sharpe Ratio for Fund A, we can use the following formula:

Sharpe Ratio = (Fund A’s average annual return – Risk-free rate) / Fund A’s standard deviation of returns

Using the above values, the Sharpe Ratio for Fund A can be calculated as follows:

Sharpe Ratio = (0.12 – 0.03) / 0.10 = 0.9

A Sharpe Ratio of 0.9 indicates that for every unit of risk taken by Fund A, it generates 0.9 units of excess return over the risk-free rate. This suggests that Fund A is a relatively attractive investment opportunity.

Example 2: Investment Fund B

Suppose we have another investment fund, Fund B, which has an average annual return of 15% and a standard deviation of returns of 20%. We also assume the same risk-free rate of 3%. To calculate the Sharpe Ratio for Fund B, we can use the same formula:

Sharpe Ratio = (Fund B’s average annual return – Risk-free rate) / Fund B’s standard deviation of returns

Using the above values, the Sharpe Ratio for Fund B can be calculated as follows:

Sharpe Ratio = (0.15 – 0.03) / 0.20 = 0.6

A Sharpe Ratio of 0.6 suggests that for every unit of risk taken by Fund B, it generates 0.6 units of excess return over the risk-free rate. This indicates that Fund B is a less attractive investment opportunity compared to Fund A, despite having a higher average annual return.

Example 3: Comparing Funds A and B

Suppose we want to compare Funds A and B to determine which one is a better investment opportunity. Using the Sharpe Ratio, we can compare the risk-adjusted returns of both funds. Assuming both funds have the same risk-free rate of 3%, we can calculate their respective Sharpe Ratios:

Sharpe Ratio of Fund A = (0.12 – 0.03) / 0.10 = 0.9 Sharpe Ratio of Fund B = (0.15 – 0.03) / 0.20 = 0.6

Comparing the two Sharpe Ratios, we can see that Fund A has a higher Sharpe Ratio, indicating that it generates higher risk-adjusted returns compared to Fund B. Therefore, investors may consider Fund A as a better investment opportunity.

Overall, the Sharpe Ratio is a valuable tool for investors to measure the risk-adjusted returns of an investment opportunity. It allows investors to compare different investment options by taking into account the amount of risk taken to generate returns, rather than just looking at the average returns in isolation.

source: Yadnya Investment Academy on YouTube

Clear Examples Of Sortino Ratio

The Sortino Ratio is a risk-adjusted performance measure that is similar to the Sharpe Ratio but places more emphasis on downside risk rather than volatility as a whole. The Sortino Ratio is used to evaluate the performance of investment portfolios that are designed to minimize risk while maximizing returns.

To better understand how the Sortino Ratio works, let’s look at some clear examples:

Example 1:

Portfolio A has an annual return of 10%, a standard deviation of 8%, and a target downside deviation of 4%. Portfolio B has an annual return of 10%, a standard deviation of 12%, and a target downside deviation of 4%.

Using the Sortino Ratio, we can see that Portfolio A has a higher ratio than Portfolio B. This means that Portfolio A is a better investment option because it generates higher returns for the same level of downside risk.

Example 2:

Investor X has two investment options, both of which have an expected annual return of 10%. However, Investment Option A has a standard deviation of 12%, while Investment Option B has a standard deviation of 8%. Investor X’s target downside deviation is 5%.

Using the Sortino Ratio, we can see that Investment Option B has a higher ratio than Investment Option A. This means that Investment Option B is a better investment option for Investor X because it generates higher returns for the same level of downside risk.

Example 3:

Portfolio Y has an annual return of 15%, a standard deviation of 20%, and a target downside deviation of 10%. Portfolio Z has an annual return of 12%, a standard deviation of 10%, and a target downside deviation of 5%.

Using the Sortino Ratio, we can see that Portfolio Z has a higher ratio than Portfolio Y. This means that Portfolio Z is a better investment option because it generates higher returns for the same level of downside risk.

Calculate The Sortino Ratio: Sortino Ratio Formula

To calculate the Sortino Ratio, you need the following information:

1. The expected annual return of the investment
2. The risk-free rate of return
3. The downside deviation of the investment (standard deviation of negative returns)

Once you have these inputs, you can use the following formula:

Sortino Ratio = (Expected annual return – Risk-free rate of return) / Downside deviation

For example, let’s say you have an investment that is expected to have an annual return of 10%, and the risk-free rate of return is 2%. The downside deviation of the investment is 5%.

Sortino Ratio = (10% – 2%) / 5% = 1.6

So the Sortino Ratio for this investment is 1.6. A higher Sortino Ratio indicates better risk-adjusted returns, as it takes into account only the negative volatility of the investment.

The Sortino Ratio is an effective tool for evaluating the performance of investment portfolios by taking into account the level of downside risk. By using the Sortino Ratio, investors can make more informed decisions about their investment strategies and better manage their overall risk.

source: James Bachini on YouTube

Which Is Better? Sharpe Ratio VS Sortino Ratio

The Sharpe ratio and the Sortino ratio are both popular risk-adjusted performance measures used in portfolio management. However, it is not necessarily a question of which one is better, but rather which ratio is more appropriate for the investment strategy and risk tolerance of the investor.

The Sharpe ratio is widely used and is a simple way to measure the risk-adjusted return of an investment portfolio. It compares the return of the portfolio to the risk-free rate of return and the volatility of the portfolio. This ratio is useful for assessing the risk and return of a portfolio in general.

On the other hand, the Sortino ratio is a more sophisticated measure that only considers the downside risk of the portfolio. It uses the same basic formula as the Sharpe ratio but replaces the standard deviation of returns with the downside deviation of returns. The downside deviation measures only the volatility of returns that fall below a specified target return, rather than considering all volatility in the portfolio. This ratio is more useful for investors who are more sensitive to downside risk and want to evaluate the effectiveness of a portfolio in protecting against losses.

In summary, the choice between the Sharpe ratio and the Sortino ratio depends on the investor’s preferences and investment strategy. For investors who are concerned about both upside and downside risks, the Sharpe ratio may be more appropriate. For investors who are more focused on avoiding downside risk, the Sortino ratio may be more useful.

source: Bionic Turtle on YouTube

Sharpe Ratio & Sortino Ratio = Risk-Adjusted Performance

When evaluating an investment, it can be helpful to use both the Sharpe ratio and Sortino ratio to gain a more comprehensive understanding of its risk-adjusted performance.

The Sharpe ratio measures an investment’s excess return above the risk-free rate per unit of its volatility. A higher Sharpe ratio indicates a better risk-adjusted performance. However, the Sharpe ratio assumes that all deviations from the expected return (both positive and negative) are equally important, which is not always the case.

The Sortino ratio, on the other hand, considers only the downside volatility, or the volatility of returns below the investor’s required minimum return. It measures the excess return earned per unit of downside volatility. The Sortino ratio is a more accurate measure of an investment’s performance since it takes into account the investor’s specific minimum required return.

source: Building Freedom on YouTube

Sharpe Ratio & Sortino Ratio Final Thoughts

To use both ratios to evaluate an investment, start by calculating the Sharpe ratio to assess the investment’s overall risk-adjusted performance. Next, calculate the Sortino ratio to specifically evaluate the investment’s downside risk.

If an investment has a high Sharpe ratio but a low Sortino ratio, it may have a lot of upside potential but is also exposed to high downside risk. Conversely, if an investment has a low Sharpe ratio but a high Sortino ratio, it may have limited upside potential but is well-protected against downside risk.

By using both the Sharpe ratio and Sortino ratio, investors can gain a more complete understanding of an investment’s risk-adjusted performance and make more informed investment decisions.

Important Information

Investment Disclaimer: The content provided here is for informational purposes only and does not constitute financial, investment, tax or professional advice. Investments carry risks and are not guaranteed; errors in data may occur. Past performance, including backtest results, does not guarantee future outcomes. Please note that indexes are benchmarks and not directly investable. All examples are purely hypothetical. Do your own due diligence. You should conduct your own research and consult a professional advisor before making investment decisions. 

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