What is Portfolio Beta?
Portfolio Beta is a measure of the volatility—or systematic risk—of an investment portfolio in comparison to the market as a whole. It represents the weighted average of the betas of the individual securities within the portfolio.
- Beta = 1.0: The portfolio moves in perfect correlation with the market.
- Beta > 1.0: The portfolio is more volatile than the market (aggressive).
- Beta < 1.0: The portfolio is less volatile than the market (defensive).
- Beta = 0: The portfolio is uncorrelated to the market (e.g., cash).
- Beta < 0: The portfolio is inversely correlated to the market (e.g., inverse ETFs).
How to Use This Calculator
- List Your Assets: Enter the name or symbol for each holding in your portfolio.
- Enter Market Value: Input the current dollar value of each position.
- Input Beta: Enter the beta coefficient for each asset. You can find this on most financial news sites or stock screeners.
- Calculate: The tool will automatically compute the weighted average beta of your entire portfolio.
Why Portfolio Beta Matters
Understanding your portfolio's beta is crucial for risk management. It helps you determine if your current allocation aligns with your risk tolerance.
For example, if you are nearing retirement, you might aim for a beta below 1.0 to preserve capital. Conversely, if you are seeking higher growth and can tolerate swings, a beta above 1.0 might be appropriate.
Frequently Asked Questions
What is the formula for Portfolio Beta?
Portfolio Beta is calculated by taking the sum of the products of each asset's weight and its beta. Portfolio Beta = (Weight₁ × Beta₁) + (Weight₂ × Beta₂) + ... + (Weightₙ × Betaₙ)
What is a good portfolio beta?
There is no "good" beta; it depends on your goals. A beta of 1.0 indicates market-level risk. Conservative investors often prefer a beta between 0.5 and 0.8, while aggressive investors may target 1.2 or higher.