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PORTFOLIO WEIGHTS / MARKET SENSITIVITY

Two-Asset Portfolio Beta Calculator

Combine two supplied asset betas using portfolio market-value weights. Review the entered period, benchmark, and risk assumptions alongside the result.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Scenario inputs

Preparing the calculator...

METHOD / WORKED EXAMPLE

Audit each asset's contribution to portfolio beta

Weighted beta is simple only after the weights and beta methodology are aligned. This page rejects incomplete allocations and keeps both contributions visible before reporting the total.

WORKED DEFAULT

Check the calculation with the default inputs

At 60% in an asset with beta 1.2 and 40% in an asset with beta 0.7, beta contributions are 0.72 and 0.28, so portfolio beta is 1.00.

  1. Weight Asset A0.60 x 1.20 = 0.72
  2. Weight Asset B0.40 x 0.70 = 0.28
  3. Add contributions0.72 + 0.28 = 1.00

READ THE RESULT

Interpret the output in context

A beta of 1.00 indicates the entered linear market sensitivity matches the benchmark's unit beta. It does not imply equal returns, equal losses, or complete portfolio risk.

ASSUMPTIONS AND LIMITS

Know where the model stops

  • Weights are current market-value shares and total exactly 100%.
  • Both betas use one benchmark, frequency, and estimation window.
  • Holdings have approximately linear exposure represented by the supplied betas.

This two-asset linear estimate does not model changing weights, nonlinear derivatives, leverage financing, or estimation uncertainty.

OpenStax: portfolio weights and probability distributions

COMMON QUESTIONS

Two-Asset Portfolio Beta Calculator FAQs

Why must the two weights total 100%?

This compact tool models a fully specified two-asset portfolio. A lower total would leave unmodeled cash or another holding; a higher total could indicate leverage or duplicated allocation. Add those exposures explicitly in a broader portfolio model rather than forcing them into either beta. Confirm that weights use current market values and the same effective date.

Can I combine betas from different data providers?

Only after confirming they use the same benchmark, return frequency, lookback window, currency treatment, and adjustment policy. Provider betas often differ because those choices differ. Mixing incompatible estimates can create a precise-looking portfolio beta with no coherent statistical basis. Re-estimate the holdings consistently or clearly disclose the mismatch and sensitivity range.

Does portfolio beta measure my maximum possible loss?

No. Beta estimates linear sensitivity to movements in a selected market benchmark. It does not bound losses or capture all company-specific, liquidity, credit, currency, concentration, option, gap, or tail risks. A portfolio with beta near one can still have very different volatility and drawdown behavior from the benchmark, particularly over short or stressed periods.

Use boundary

Calculation path

Convert both market-value weights to decimals, multiply each by its matched beta, and add the two contributions.

Calculation path

Portfolio beta = weight A x beta A + weight B x beta B.