What Is BTC beta?
BTC beta, or Bitcoin beta, measures the sensitivity of an asset, strategy, or portfolio’s returns to returns on Bitcoin. It is the usual beta calculation with BTC as the benchmark: a beta of 1 means that the subject has historically moved by about 1% when BTC moved by 1%; 1.5 indicates larger co-movement; 0 indicates no linear BTC exposure; and a negative beta indicates a tendency to move in the opposite direction. It measures historical co-movement, not a prediction or a causal relationship.
For matched return observations over a stated look-back window, BTC beta is conventionally estimated either as the slope of a regression on BTC returns or as:
BTC beta = Covariance(asset returns, BTC returns) / Variance(BTC returns)
The result depends materially on the asset or portfolio being measured, the BTC price series, return frequency, currency, and sampling window. In crypto, this measure is useful for separating an altcoin or strategy’s broad Bitcoin exposure from its alpha relative to BTC. It is also used for traditional portfolios: then it describes their exposure to Bitcoin risk and should normally be estimated alongside equity and bond factors, rather than interpreted as a stand-alone risk measure.
BTC beta should not be confused with Bitcoin’s beta to an equity index such as the S&P 500. In the former, BTC is the benchmark and the other asset is the subject; in the latter, BTC is the subject and the equity index is the benchmark. Neither version is stable through time, especially in markets with changing correlations and volatility.
Literature and references:
Zhenhua Huang, Man Xie and Youhong Zhang, Managing cryptocurrency risk exposures in equity portfolios: Evidence from high-frequency data, Journal of International Financial Markets, Institutions and Money, 2025.
See also