A portfolio can look wonderful on a statement and still be a nerve-wracking ride. A 10% annual return means very different things if it came from a calm, diversified fund versus a handful of volatile stocks that swung 40% in a single quarter. The Sharpe ratio was invented by Nobel laureate William F. Sharpe in 1966 precisely to cut through that confusion: it measures how much extra return your portfolio delivers per unit of risk. This calculator takes your annual return, the risk-free rate, and your volatility, then gives you the Sharpe ratio plus the dollar excess return your portfolio is earning above a safe Treasury benchmark.
Adjust the sliders and every figure updates instantly, so you can stress-test a candidate fund, compare two portfolios, or sanity-check your own long-term asset mix.
How to Use
- Enter your Portfolio Annual Return. Use the annualized total return — dividends included — not just the price change. If you are testing a fund, its trailing 1-year total return is a reasonable starting point.
- Set the Risk-Free Rate. This is what you could earn with zero risk, usually the yield on a 10-year US Treasury note. In a low-rate environment 2%–4% is typical; in a high-rate environment 4%–5% is more realistic.
- Type your Standard Deviation (Volatility), the annualized standard deviation of monthly or yearly returns. A bond-heavy portfolio might run at 4%–6%; a balanced 60/40 fund around 10%–12%; an all-stock fund 15%–25%; a concentrated sector fund well above 25%.
- Optionally add your Portfolio Value. The calculator then converts the percentage excess return into dollars, so you can see exactly how much your risk-taking is earning above what Treasuries would pay.
- Read the result card: the Excess Return is your return minus the risk-free rate, the Sharpe Ratio is that excess divided by volatility, and the Annual Excess Return is the dollar version of the excess.
A Sharpe of 1.0 or better is generally considered good, 1.5+ is very good, and 2.0+ is excellent. Below 0.5 your portfolio is taking risk without being paid for it, and a negative Sharpe means you would have been better off in Treasuries.
The Sharpe Ratio Formula
The formula is deliberately simple:
Sharpe = (R(p) − R(f)) / σ(p)
Where:
- R(p) is the annualized return of your portfolio.
- R(f) is the risk-free rate you could earn instead.
- σ(p) is the annualized standard deviation (volatility) of portfolio returns.
Worked example, which is also the default on this page: a portfolio returning 10%, a risk-free rate of 2%, and volatility of 15%. The excess return is 10% − 2% = 8%, and 8 divided by 15 gives a Sharpe ratio of 0.53. Translated into dollars on a $100,000 portfolio, that excess return is worth about $8,000 per year above what Treasury bills would have paid.
The ratio is unitless, which is what makes it comparable across asset classes: a bond fund and a stock fund can be judged on the same scale, because both are measured in "reward per unit of volatility."
Examples
Example 1 — The default portfolio. Enter 10% return, 2% risk-free, 15% volatility, and a $100,000 portfolio value. The excess return is 8%, the Sharpe ratio lands at 0.53, and the annual excess return is $8,000. At 0.53 the portfolio is not yet "good" by the 1.0 threshold — it is taking real risk for only modest compensation, which is a useful wake-up call.
Example 2 — A calm 60/40 fund. Suppose a balanced fund returns 8% with only 8% volatility, while Treasuries pay 2%. Excess = 6%, Sharpe = 6 / 8 = 0.75. On a $250,000 portfolio that is $15,000 per year of excess return. Even though its raw return (8%) looks lower than the default portfolio's 10%, the balanced fund is actually being paid far more per unit of risk.
Example 3 — A high-flying sector fund. A tech-focused fund returns 18% but swings 30% a year. With a 2% risk-free rate, excess = 16%, Sharpe = 16 / 30 = 0.53. The raw return looks amazing, but the Sharpe is identical to the calm 10%-return default case, because the extra return came with proportionally extra risk. On a $1,000,000 portfolio the excess dollars are $160,000, yet most investors would find that ride emotionally unmanageable.
Example 4 — A losing year. If the portfolio loses 5% while Treasuries pay 2%, the excess is −7%. Divided by 15% volatility, the Sharpe is −0.47. The calculator flags this explicitly: negative Sharpe means the risk-free alternative won, and the asset mix needs rethinking.
FAQ
What is a good Sharpe ratio?
A Sharpe ratio of 1.0 or higher is commonly considered good, 1.5 or higher very good, and 2.0 or higher excellent. Anything below 0.5 means your portfolio earns only modest compensation for its volatility, and a negative ratio means you would have done better in risk-free Treasury bills. Over very long horizons the S&P 500 itself has historically run around 0.4–0.6, so a steady 1.0+ from a balanced fund is genuinely strong.
How is the Sharpe ratio calculated?
The formula is (portfolio return − risk-free rate) ÷ standard deviation. For example, a 10% portfolio return with a 2% risk-free rate and 15% volatility gives (10 − 2) / 15 = 0.53. You can replicate every number on this page by typing the same three inputs into this calculator.
What risk-free rate should I use?
Use the yield you could actually lock in today with no default risk, almost always the 10-year US Treasury note. Recent yields have hovered in the 4%–5% range, so many analysts now run 4%–5% rather than the 1%–2% that was normal in the 2010s. Sensitivity matters little: changing the risk-free rate from 2% to 5% on a 10% return with 15% volatility moves the Sharpe from 0.53 to 0.33.
Can the Sharpe ratio be negative?
Yes, and it is meaningful. A negative Sharpe simply means your portfolio's return came in below the risk-free rate — in other words, taking risk lost money versus parking it in Treasuries. It is common in bear-market years and is not a calculation error.
Why does volatility go in the denominator?
Volatility is the cost you pay for returns. Two funds can both return 10%, but the one that gets there with smaller ups and downs (lower standard deviation) lets you sleep better and is less likely to force a sale at the bottom. Dividing excess return by volatility measures exactly that efficiency: reward per unit of pain.
Does the Sharpe ratio work for any asset?
Yes, which is its greatest strength. Bonds, stocks, crypto, hedge funds, and private equity can all be compared on the same scale, because the output is unitless. In practice it is most reliable for diversified, regularly priced portfolios; for assets with fat tails or stale prices (real estate, venture funds), it can understate true risk and should be paired with other metrics like the Sortino ratio or maximum drawdown.
Disclaimer
This Sharpe ratio calculator is provided for informational purposes only and does not constitute investment, financial, tax, or legal advice. The ratio is a snapshot based on the three numbers you enter; historical volatility and returns are not guarantees of future results, and the appropriate risk-free rate changes with market conditions. Always verify inputs against official fund documents and consult a licensed financial advisor before making allocation decisions.