When choosing a mutual fund, most investors fixate on past returns. A fund that delivered 20% last year looks attractive, but what if it crashed 30% the year before? This is where risk metrics become your compass, helping you understand not just how much a fund earned, but how efficiently and consistently it generated those returns.
Before diving into advanced metrics, let’s understand the most basic risk measure: standard deviation (also called volatility).
Standard deviation measures how much a fund’s returns deviate from its average return. In simple terms, it tells you how unpredictable a fund’s performance is.
Example: If a fund’s monthly returns over 6 months are 2%, -1%, 3%, 1%, -2%, 4%, the average return is 1.17%. Standard deviation measures how far each month’s return typically strays from this 1.17% average. A higher number means more unpredictable swings.
-
Low volatility (5-10%): Stable, predictable funds like debt or large-cap equity
-
Medium volatility (10-20%): Typical diversified equity funds
-
High volatility (20%+): Aggressive funds, sector funds, or small-cap funds
While standard deviation is useful, it has a critical flaw: it treats upward and downward movements equally. This is why sophisticated investors look deeper.
Different Risk Metrics:
1. Sharpe Ratio: Risk-Adjusted Returns Made Simple
The Sharpe ratio answers a critical question: “Am I getting paid enough for the risk I’m taking?”
Formula: (Fund Return - Risk-Free Return) / Standard Deviation
What it means: A Sharpe ratio above 1 is considered good, above 2 is excellent, and above 3 is outstanding. If Fund A has a Sharpe ratio of 1.5 and Fund B has 0.8, Fund A is delivering better returns per unit of risk.
2. Sortino Ratio: Focus on the Downside
The Sortino ratio improves on the Sharpe ratio by only penalizing downside volatility, ignoring the upside swings you actually want.
Formula : (Fund Return - Target Return) / Downside deviation
Some funds are volatile because they capture big gains during market rallies. The Sortino ratio doesn’t punish them for this. It focuses purely on painful losses below your target return. If you’re comparing aggressive funds or sector funds that naturally swing more, the Sortino ratio gives you a clearer picture than the Sharpe ratio.
3. Maximum Drawdown: Your Worst-Case Scenario
Maximum drawdown measures the largest peak-to-valley decline in a fund’s history.
Formula : (Trough Value- Peak Value) / Peak Value * 100
Maximum drawdown measures the largest peak-to-valley decline in a fund’s history. If a fund peaked at ₹100 NAV and then fell to ₹70 before recovering, its maximum drawdown is 30%. This number tells you whether you could have handled the ride emotionally. Many investors who see great long-term returns forget that during 2008 or March 2020, their fund might have dropped 40-50%. Maximum drawdown helps you honestly assess your risk tolerance.
4. Rolling Returns: The Consistency Test
Rolling returns show you what returns an investor would have earned over every possible time period, not just cherry-picked dates. Instead of just checking “5-year returns ending today,” rolling returns show you the returns for every 5-year period over the past decade. A fund might show stellar 5-year returns if measured from a market bottom, but rolling returns reveal if it consistently delivered across different market conditions. Funds with tight clustering in rolling returns (most periods showing similar results) demonstrate consistency, while wide variations suggest returns are timing-dependent or erratic.
Returns grab headlines, but risk metrics protect your wealth. Before investing in any mutual fund, spend time understanding these four metrics. They won’t predict the future, but they’ll help you make informed decisions and choose funds that match both your financial goals and emotional capacity for risk.
At Upstox, we are currently working on how we can make these available to our seasoned investors and help them choose the best fund for their needs. Have you started your mutual fund investment journey?
Remember: the best fund isn’t the one with the highest returns, it’s the one you can hold through market storms without losing sleep.