Sharpe Ratio Calculator

Understanding the Sharpe Ratio

The Sharpe Ratio is one of the most widely used metrics in finance for measuring risk-adjusted return. Developed by Nobel laureate William F. Sharpe in 1966, it helps investors understand the return of an investment compared to its risk. The ratio describes how much excess return you receive for the extra volatility you endure for holding a riskier asset.

The mathematical formula for the Sharpe Ratio is:

Where R_p is the expected return of the portfolio, R_f is the risk-free rate of return, and σ_p is the standard deviation (volatility) of the portfolio's excess return.

A higher Sharpe ratio indicates a more attractive risk-adjusted return. A ratio greater than 1.0 is generally considered acceptable to good by investors, a ratio higher than 2.0 is rated as very good, and a ratio of 3.0 or higher is considered excellent. If the Sharpe ratio is negative, it indicates that the risk-free rate is greater than the portfolio's return, or that the portfolio's return is expected to be negative. In hedge funds, maintaining a high Sharpe ratio is often seen as a sign of skill, distinguishing a manager who generates returns through alpha rather than just taking on excessive market risk (beta).

However, the Sharpe Ratio assumes that returns are normally distributed and penalizes both upside and downside volatility equally. For strategies with non-normal return distributions or those focused purely on minimizing losses, you might also want to review our Sortino Ratio Calculator. Additionally, check out the Alpha & Beta Calculator to separate market risk from managerial skill.