Sortino Ratio Calculator
Calculate the Sortino ratio to evaluate investment returns adjusted for downside risk. Compare portfolio performance based on harmful volatility below the target return.
About This Calculator
The Sortino ratio is a risk-adjusted return metric that improves upon the Sharpe ratio by considering only downside volatility. Developed by Frank A. Sortino, this ratio helps investors understand how much excess return they earn for the downside risk they take, ignoring positive volatility that benefits them.
Our calculator computes the Sortino ratio for your portfolio by comparing your returns against the risk-free rate and measuring only harmful downside deviation. This gives you a clearer picture of risk-adjusted performance.
Sortino Ratio Formula:
Sortino Ratio = (Portfolio Return - Risk-Free Rate) / Downside Deviation
What is Downside Deviation?
Downside deviation measures the volatility of negative returns only. Unlike standard deviation which includes both positive and negative movements, downside deviation sets positive returns to zero and only calculates the variability of losses. This makes it a more targeted measure of investment risk.
Sortino Ratio Interpretation:
- Above 3: Excellent risk-adjusted returns
- 2 to 3: Very good risk-adjusted returns
- 1 to 2: Good risk-adjusted returns
- 0 to 1: Fair risk-adjusted returns
- Below 0: Portfolio underperforming risk-free rate
Regional Context:
- India: Risk-free rate based on 10-year G-Sec yield (~6.5-7%). Equity mutual funds typically have downside deviation of 8-15%.
- US: Risk-free rate based on 10-year Treasury yield (~4-5%). S&P 500 downside deviation averages 10-12%.
- UK: Risk-free rate based on 10-year Gilt yield (~3.5-4.5%). FTSE 100 downside deviation averages 9-11%.
Sortino vs Sharpe Ratio:
- Sharpe Ratio: Uses total standard deviation (all volatility)
- Sortino Ratio: Uses only downside deviation (negative volatility only)
- When similar: For normally distributed returns, both give similar results
- When different: For asymmetric return distributions, Sortino is more accurate
Frequently Asked Questions
What is the Sortino ratio?
The Sortino ratio is a risk-adjusted return metric that measures excess return per unit of downside risk. Unlike the Sharpe ratio which considers all volatility (both upside and downside), the Sortino ratio only penalizes harmful downside volatility. It is calculated as (Portfolio Return - Risk-Free Rate) divided by Downside Deviation. A higher Sortino ratio indicates better risk-adjusted returns.
How is the Sortino ratio calculated?
Sortino Ratio = (Portfolio Return - Risk-Free Rate) ÷ Downside Deviation. Portfolio return is the investment's annual return. Risk-free rate is typically government bond yield (around 6-7% in India, 4-5% in US, 3.5-4.5% in UK). Downside deviation measures volatility of only negative returns. Our calculator computes this automatically when you input these three values.
What is a good Sortino ratio?
A Sortino ratio above 1 is considered good, above 2 is very good, and above 3 is excellent. Below 1 suggests returns may not adequately compensate for the downside risk taken. A negative Sortino ratio indicates the investment underperformed the risk-free rate. Most diversified equity portfolios have Sortino ratios between 0.5 and 1.5 depending on market conditions.
What is the difference between Sortino ratio and Sharpe ratio?
The key difference is how they measure risk. The Sharpe ratio uses total standard deviation (penalizing both upside and downside volatility), while the Sortino ratio uses only downside deviation (penalizing only negative volatility). The Sortino ratio is generally considered superior because investors are primarily concerned with downside risk, not upside volatility. For investments with asymmetric return distributions, the Sortino ratio provides a more accurate risk assessment.
What is downside deviation in the Sortino ratio?
Downside deviation is a measure of downside risk that only considers negative returns. It is calculated by taking the standard deviation of all returns that fall below a minimum acceptable return (MAR), typically set as the risk-free rate or zero. Positive returns are replaced with zero when calculating downside deviation, so only harmful volatility is captured. This makes the Sortino ratio more focused on protecting against losses.
How do investors use the Sortino ratio?
Investors use the Sortino ratio to compare investments with different risk profiles by focusing on downside risk. A higher Sortino ratio indicates better returns per unit of bad risk. It is particularly useful for evaluating hedge funds, options strategies, and any investment with asymmetric returns where upside volatility is not a concern. Fund managers use it to demonstrate their ability to generate returns while minimizing losses.
Can the Sortino ratio be negative?
Yes, the Sortino ratio is negative when the portfolio return is less than the risk-free rate. This means the investment failed to beat a no-risk alternative and the investor took on downside risk for no benefit. A negative Sortino ratio is a red flag that suggests reconsidering the investment strategy. In India, US, and UK markets, consistently negative Sortino ratios indicate poor risk management.
What are limitations of the Sortino ratio?
The Sortino ratio requires a sufficient number of data points to calculate a meaningful downside deviation. It also relies on historical data which may not predict future performance. The choice of minimum acceptable return (MAR) can significantly affect results. Additionally, like all risk-adjusted metrics, the Sortino ratio should be used alongside other analysis tools rather than as the sole decision factor for investment choices.