Share | Stock Beta Calculator Use the Stock Beta Calculator to compute the beta for any stock listed on a major U.S. stock exchange and supported by Quandl. A common benchmark used to compute beta is the S&P 500. However, the calculator does not support actual S&P 500 prices but it does support the SPDR® S&P 500 ETF (SPY), an exchange-traded fund that tracks the S&P 500. Therefore, use the symbol SPY, when you want the benchmark to be the S&P 500. The calculator uses percent returns derived from prices for the stock and benchmark to compute beta. The returns are based on unadjusted closing prices. Beta can be calculated using daily, weekly or monthly closes for a specified period. The calculator's default settings are 37 months of monthly prices to give 36 returns. Enter a valid stock symbol, a valid symbol for a benchmark, interval and date information. Then click on the Calculate Beta button and the results will be displayed on a new page. Stock Beta Calculator Quote Symbol for Stock: Quote Symbol for Benchmark: Price & Return Interval: Daily Weekly Monthly Date Info: Month Day Year Start Date: Oct Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec End Date: Oct Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Calculator does not support mutual funds or indexes. Computational Notes The calculator computes beta using the following formula: beta = covariance of the stock's and the benchmark's returns / variance of the benchmark's returns This procedure is called the regression method and it is identical to the SLOPE function in Microsoft Excel. For more information about computing beta see How to Calculate Beta. Beta values for the same stock vary greatly among financial sites because different benchmarks and time intervals are used to compute beta. The results table includes the correlation coefficient for the stock and benchmark returns. Related Calculators Capital Asset Pricing Model (CAPM) Calculator Stock Return Calculator Stock Correlation Calculator Stock Volatility Calculator