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Alpha Beta Calculator

Calculate investment portfolio Alpha (α) and Beta (β) to measure risk-adjusted performance vs market benchmark.

Enter monthly/quarterly/annual returns (same period as market)

Use S&P 500 or relevant index (must match portfolio periods)

2025: 10-Year Treasury ~4.5%, 3-Month T-Bill ~5.3%

Performance Metrics

Beta (β)1.33

⚠️ Higher volatility than market

Alpha (α)+0.77%

✅ Outperforming risk-adjusted expectations

Portfolio Avg Return:8.02%
Market Avg Return:6.57%
CAPM Expected Return:7.25%
Risk-Free Rate:4.50%

Interpretation:

Your portfolio has a beta of 1.33 (33% more volatile than market) and generated +0.77% alpha (outperformance) after risk adjustment.

How to use:

  1. Enter portfolio returns for past 12-36 months (comma-separated)
  2. Enter market benchmark returns for same periods (e.g., S&P 500 for US stocks)
  3. Set risk-free rate (2025: 10Y Treasury ~4.5%, 3M T-Bill ~5.3%)
  4. Beta measures volatility vs market; Alpha measures skill/outperformance