This is a free spreadsheet that downloads free historical stock data from the Yahoo database and calculates the historical (realized) volatility of the selected stock. The standard deviation of prices are plotted along side the stock price chart. The user can freely change the stock used by entering the ticker symbol into the appropriate field and perform a fresh download....
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publisher/developer site This download (Stock Volatility Calculator) is freeware. "Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period or for additional functionality)." More info at
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