Sharpe Ratio Calculator
Measure the risk-adjusted return of your portfolio or investment. The Sharpe ratio tells you how much excess return you earn for each unit of risk taken.
Quick Answer
A portfolio returning 12% with a risk-free rate of 4.5% and standard deviation of 15% has a Sharpe ratio of 0.50. This means for every 1% of additional risk (volatility), the portfolio earns 0.50% in excess return above the risk-free rate. A ratio below 1 is considered suboptimal; 1-2 is good; above 2 is very good; above 3 is excellent.
Typically the 10-year Treasury yield. Currently around 4-5%.
Sharpe Ratio Result
Below average risk-adjusted returns. The excess return does not adequately compensate for the risk taken.
Formula
Sharpe Ratio = (Rp - Rf) / sigma_p
= (12% - 4.5%) / 15%
= 7.50% / 15%
= 0.5000
Sharpe Ratio Rating Scale
| Range | Rating | Interpretation |
|---|---|---|
| < 0 | Negative | Losing to the risk-free rate |
| 0 - 1 | Poor | Suboptimal risk-adjusted returns |
| 1 - 2 | Good | Reasonable risk-adjusted returns |
| 2 - 3 | Very Good | Strong risk-adjusted returns |
| > 3 | Excellent | Exceptional (rarely sustained) |
About This Tool
The Sharpe Ratio Calculator helps investors and portfolio managers evaluate the risk-adjusted performance of an investment or portfolio. Developed by Nobel laureate William F. Sharpe in 1966, the Sharpe ratio is one of the most widely used metrics in finance for comparing the efficiency of different investments. It answers a fundamental question: how much excess return am I earning for each unit of risk I am taking? A higher Sharpe ratio indicates a more efficient use of risk to generate returns.
Understanding the Sharpe Ratio Formula
The Sharpe ratio is calculated as: (Rp - Rf) / sigma_p, where Rp is the portfolio return, Rf is the risk-free rate (typically the yield on U.S. Treasury bills or bonds), and sigma_p is the standard deviation of portfolio returns (a measure of volatility). The numerator represents the excess return, or how much more the portfolio earns above the risk-free rate. The denominator represents the total risk (volatility) of the portfolio. By dividing excess return by risk, the Sharpe ratio normalizes performance across investments with different risk profiles, making it possible to compare a conservative bond fund to an aggressive stock portfolio on an apples-to-apples basis.
Interpreting Sharpe Ratio Values
A Sharpe ratio below 0 means the portfolio is underperforming the risk-free rate, which means you would be better off holding Treasury bills. A ratio between 0 and 1 indicates that the portfolio generates some excess return but not enough to justify its risk level for most investors. A ratio between 1 and 2 is generally considered good and indicates the portfolio is generating meaningful excess return relative to its volatility. Ratios between 2 and 3 are considered very good and typically achieved only by skilled active managers or during favorable market conditions. Ratios above 3 are exceptional and rarely sustained over long periods, as they often reflect unique market conditions, illiquid assets with understated volatility, or short measurement periods.
Choosing the Risk-Free Rate
The risk-free rate should match the time horizon of the investment being evaluated. For short-term portfolios, the 3-month Treasury bill rate is appropriate. For longer-term investments, the 10-year Treasury yield is more commonly used. As of 2026, U.S. Treasury yields range from approximately 4% to 5%, significantly higher than the near-zero rates that prevailed from 2009 to 2021. The choice of risk-free rate directly affects the Sharpe ratio: a higher risk-free rate reduces the excess return and therefore the Sharpe ratio, making it harder for portfolios to score well in higher interest rate environments.
Standard Deviation as a Risk Measure
Standard deviation measures the dispersion of returns around the average. A portfolio with 15% standard deviation means that in roughly two-thirds of periods, returns will fall within 15 percentage points above or below the average return. Higher standard deviation means greater uncertainty about future returns. The S&P 500 has historically had an annual standard deviation around 15-16%. Bond portfolios typically show 5-8%. Cryptocurrency portfolios can exceed 50-60%. The Sharpe ratio uses total volatility (both upside and downside) as its risk measure, which is one of its limitations since most investors are primarily concerned about downside risk.
Limitations of the Sharpe Ratio
The Sharpe ratio assumes that returns follow a normal distribution, which is often not the case. Many investments have fat tails (extreme events occur more frequently than a normal distribution predicts) or skewed returns. The ratio treats upside and downside volatility equally, but investors typically only want to minimize downside risk. The Sortino ratio addresses this by using only downside deviation in the denominator. The Sharpe ratio can also be gamed by using leverage, selling options (which collect premium but carry catastrophic tail risk), or investing in illiquid assets that appear less volatile because they are not marked to market frequently. Always use the Sharpe ratio alongside other metrics like maximum drawdown, Sortino ratio, and Calmar ratio for a complete picture.
Sharpe Ratios of Common Benchmarks
For context, the S&P 500 has historically produced a Sharpe ratio of approximately 0.4 to 0.5 over long periods (using the 10-year Treasury as the risk-free rate). During strong bull markets, the S&P 500's Sharpe ratio can exceed 1.0, while during bear markets it turns negative. A 60/40 stock/bond portfolio historically achieves a Sharpe ratio of approximately 0.5 to 0.7. Top-performing hedge funds may sustain Sharpe ratios of 1.0 to 2.0 over multiple years, which is considered exceptional in the institutional investing world. Individual strategies like trend-following or merger arbitrage may achieve higher ratios over certain periods but rarely sustain them indefinitely.