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Sharpe Ratio Calculator

Calculate the Sharpe Ratio to measure risk-adjusted return of an investment or portfolio. Compare the excess return above the risk-free rate per unit of volatility to evaluate investment efficiency.

Reviewed by Christopher FloiedUpdated

This free online sharpe ratio calculator provides instant results with no signup required. All calculations run directly in your browser — your data is never sent to a server. Enter your values below and see results update in real time as you type. Perfect for everyday calculations, homework, or professional use.

The average annual return of the portfolio as a percentage.

The return on a risk-free asset such as Treasury bills.

The annualized standard deviation of portfolio returns (volatility).

How to Use This Calculator

1

Enter your input values

Fill in all required input fields for the Sharpe Ratio Calculator. Most fields include unit selectors so you can work in your preferred unit system — metric or imperial, whichever matches your problem.

2

Review your inputs

Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors and can produce results that are off by factors of 2, 10, or more.

3

Read the results

The Sharpe Ratio Calculator instantly computes the output and displays results with units clearly labeled. All calculations happen in your browser — no loading time and no data sent to a server.

4

Explore parameter sensitivity

Try adjusting individual input values to see how the output changes. This is a quick and effective way to develop intuition about how different parameters influence the result and to identify which inputs have the largest effect.

Formula Reference

Sharpe Ratio Calculator Formula

See calculator inputs for the governing equation

Variables: All variables and their units are labeled in the calculator interface above. Input fields accept values in multiple unit systems — select your preferred unit from the dropdown next to each field.

When to Use This Calculator

  • •Use the Sharpe Ratio Calculator when comparing financial options side-by-side — such as different loan terms or investment returns — to make more informed decisions.
  • •Use it to quickly estimate costs or returns before making purchasing, investment, or borrowing decisions.
  • •Use it for financial education and planning to understand how compound interest, fees, or tax affects the real value of money over time.
  • •Use it when building or reviewing a budget to verify that projections and calculations are mathematically correct.

About This Calculator

The Sharpe Ratio Calculator is a free financial calculation tool designed to help individuals and businesses understand key financial concepts and estimate costs, returns, and loan parameters. Calculate the Sharpe Ratio to measure risk-adjusted return of an investment or portfolio. Compare the excess return above the risk-free rate per unit of volatility to evaluate investment efficiency. The calculations are based on standard financial mathematics formulas. Results are for informational and educational purposes only and should not be considered financial, investment, or tax advice. Consult a qualified financial professional before making financial decisions. All calculations are performed in your browser — no personal financial data is stored or transmitted.

About Sharpe Ratio Calculator

The Sharpe Ratio calculator measures the risk-adjusted performance of an investment by comparing its excess return over the risk-free rate to its volatility. Developed by Nobel laureate William Sharpe in 1966, it remains one of the most widely used metrics in portfolio management and investment analysis. Fund managers, financial advisors, and individual investors use the Sharpe Ratio to compare different investments on a level playing field. A higher Sharpe Ratio indicates better compensation for the risk taken. Generally, a ratio above 1.0 is considered acceptable, above 2.0 is very good, and above 3.0 is excellent.

The Math Behind It

The Sharpe Ratio is defined as (Rp - Rf) / sigma, where Rp is the portfolio return, Rf is the risk-free rate, and sigma is the standard deviation of the portfolio's excess returns. William Sharpe introduced this measure in 1966 as a way to evaluate mutual fund performance, and it earned him part of the 1990 Nobel Memorial Prize in Economics. The ratio builds on Modern Portfolio Theory developed by Harry Markowitz, which established that investors should evaluate investments not just by return but by the relationship between return and risk. The numerator captures the excess return, the premium earned above what could be achieved risk-free. The denominator measures total risk through volatility as captured by standard deviation. A key limitation is that the Sharpe Ratio treats upside and downside volatility equally, even though investors typically only dislike downside volatility. This led to the development of the Sortino Ratio, which uses only downside deviation. The Sharpe Ratio also assumes returns are normally distributed, which fails to capture tail risks and fat-tailed distributions common in financial markets. Despite these limitations, it remains the industry standard for risk-adjusted performance comparison. When comparing funds, always ensure you use the same time period and risk-free rate benchmark for consistency.

Formula Reference

Sharpe Ratio

S = (Rp - Rf) / σp

Variables: Rp = portfolio return; Rf = risk-free rate; σp = standard deviation of portfolio returns

Worked Examples

Example 1: Equity mutual fund evaluation

A fund returned 12% per year with 15% standard deviation. The risk-free rate is 4%.

Step 1:Excess return = 12% - 4% = 8%.
Step 2:Sharpe Ratio = 8% / 15% = 0.533.

The Sharpe Ratio is 0.533, indicating moderate risk-adjusted performance.

Example 2: Comparing two portfolios

Portfolio A: 15% return, 20% std dev. Portfolio B: 10% return, 8% std dev. Risk-free rate: 3%.

Step 1:Sharpe A = (15 - 3) / 20 = 0.60.
Step 2:Sharpe B = (10 - 3) / 8 = 0.875.

Portfolio B has the higher Sharpe Ratio (0.875 vs 0.60), meaning it delivers better risk-adjusted returns despite lower absolute returns.

Common Mistakes & Tips

  • !Comparing Sharpe Ratios calculated over different time periods, which makes the comparison invalid due to different market conditions.
  • !Using nominal returns instead of excess returns by forgetting to subtract the risk-free rate from the portfolio return.
  • !Interpreting a high Sharpe Ratio in isolation without considering that past performance does not guarantee future results.
  • !Applying the ratio to investments with non-normal return distributions like options or hedge funds without acknowledging its limitations.

Related Concepts

CAPM

The Capital Asset Pricing Model uses systematic risk to calculate expected return, complementing the Sharpe Ratio's total risk approach.

ROI

A simpler return measure that does not account for risk or volatility.

Used in These Calculators

Calculators that build on or apply the concepts from this page:

Beta Coefficient Calculator

Frequently Asked Questions

What is a good Sharpe Ratio?

Generally, a Sharpe Ratio below 1.0 is considered sub-par, 1.0 to 1.99 is acceptable to good, 2.0 to 2.99 is very good, and 3.0 or above is excellent. Most diversified equity portfolios have Sharpe Ratios between 0.5 and 1.0 over long periods.

Can the Sharpe Ratio be negative?

Yes, it is negative when the portfolio return is below the risk-free rate. This indicates the investor would have been better off holding risk-free assets instead of taking on portfolio risk.

What is the difference between the Sharpe and Sortino Ratios?

The Sharpe Ratio uses total volatility (standard deviation of all returns), while the Sortino Ratio uses only downside deviation. The Sortino Ratio is preferred when returns are asymmetric because it does not penalize upside volatility.