Calculator Inputs
Use manual values, or paste a return series to auto-calculate mean return and sample volatility.
Formula Used
Sharpe Ratio = (Return − Risk-Free Rate) / Volatility
Periodic Sharpe = (Rp − Rf) / σp
Annualized Sharpe = Periodic Sharpe × √N
Sample Volatility from Return Series = standard deviation of all pasted observations.
Use periodic inputs when your return, risk-free rate, and volatility all share the same interval, such as monthly or daily.
Use annual inputs when your figures are already annualized. Keep the time basis consistent or the ratio becomes misleading.
How to Use This Calculator
- Enter a portfolio name so exported files stay organized.
- Choose Manual inputs for direct return, risk-free rate, and volatility values.
- Choose Return series to paste periodic observations and let the calculator derive average return and sample volatility.
- Pick the correct input basis: periodic or annual.
- Select percent or decimal format before entering numbers.
- Set periods per year for annualization, such as 12 or 252.
- Press Calculate Sharpe Ratio to view the result section above the form.
- Use the export buttons to save your result summary as CSV or PDF.
Example Data Table
| Month | Portfolio Return | Risk-Free Rate | Excess Return |
|---|---|---|---|
| January | 1.80% | 0.20% | 1.60% |
| February | 1.20% | 0.20% | 1.00% |
| March | -0.50% | 0.20% | -0.70% |
| April | 2.10% | 0.20% | 1.90% |
| May | 0.90% | 0.20% | 0.70% |
| June | 1.40% | 0.20% | 1.20% |
| Approximate annualized Sharpe | 3.6014 | ||
FAQs
1. What does the Sharpe Ratio measure?
It measures how much excess return a portfolio earns for each unit of volatility. Higher values usually indicate better risk adjusted performance, assuming the inputs are reliable and consistent.
2. What is considered a good Sharpe Ratio?
A ratio below 1 is often viewed as weak, 1 to 2 acceptable, 2 to 3 strong, and above 3 excellent. Context still matters, especially asset class, leverage, and market cycle.
3. Can the Sharpe Ratio be negative?
Yes. A negative ratio means the portfolio underperformed the risk-free rate after accounting for volatility. That usually signals poor risk adjusted results for the selected period.
4. Should I use periodic or annual inputs?
Use periodic inputs when your return, risk-free rate, and volatility are monthly, weekly, or daily. Use annual inputs only when all three values are already annualized.
5. Why does the return series override manual fields?
A return series lets the calculator compute average return and sample volatility directly from observations. That avoids manual estimation errors and produces a more transparent Sharpe calculation.
6. Does a higher Sharpe Ratio always mean a better investment?
Not always. The ratio ignores liquidity, tail risk, skew, fees, and changing market conditions. Use it with drawdown, Sortino, beta, and qualitative analysis.
7. Why is sample volatility used for pasted returns?
Sample volatility is common when you estimate risk from observed return data. It adjusts for the limited sample size and is appropriate for most portfolio analysis workflows.
8. Can I compare portfolios with different data frequencies?
Yes, but only after converting them to a common basis. This calculator annualizes periodic Sharpe values using the selected periods per year to support cleaner comparisons.