Understanding the Sharpe Ratio

The ultimate guide to measuring risk-adjusted returns in your portfolio.

Quick Definition

The Sharpe Ratio measures the performance of an investment compared to a risk-free asset, after adjusting for its risk. It helps you understand if your returns are due to smart investment decisions or simply taking on too much risk.

The Formula

Sharpe Ratio = (Rp - Rf) / σp

Rp: Portfolio Return
Rf: Risk-Free Rate
σp: Std Dev of Returns

Why It Matters

Two portfolios might both return 10% in a year. However, if Portfolio A has a Sharpe Ratio of 1.5 and Portfolio B has a Sharpe Ratio of 0.5, Portfolio A is much more efficient. It achieved its 10% return with significantly lower volatility.

Interpretation Guide

< 1.0

Sub-optimal / Poor

1.0 - 1.9

Good / Acceptable

2.0 - 2.9

Very Good

> 3.0

Excellent / Elite

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