The Sharpe ratio measures the excess return per unit of risk in an investment portfolio. It evaluates how much additional return an investor receives for the extra risk taken compared to a risk-free investment.
Sharpe Ratio = (Portfolio Return - Risk-Free Rate) ÷ Standard Deviation
Analysis: Even though Fund A has a higher absolute return (15% vs 14%), Fund B has a better Sharpe ratio (1.31 vs 0.958). This suggests Fund B provides more return per unit of risk, making it potentially a better investment choice despite its slightly lower absolute return.
| Measure | Fund A | Fund B | Better Option |
|---|---|---|---|
| Return | 15% | 14% | Fund A |
| Risk (Standard Deviation) | 12% | 8% | Fund B |
| Sharpe Ratio | 0.958 | 1.31 | Fund B |
This example demonstrates why looking at returns alone can be misleading. The Sharpe ratio helps identify which investment provides better risk-adjusted returns.
A more conservative measure that only considers downside risk (negative deviations) rather than total volatility.
Uses beta instead of standard deviation to measure risk, focusing on systematic market risk rather than total volatility.
Despite these variations, the Sharpe ratio remains the most widely used risk-adjusted performance measure.
The Sharpe ratio is particularly valuable when:
In essence, the Sharpe ratio answers the question: "How much additional return am I getting for the extra risk I'm taking?"