This free online Stock Shares Outstanding Calculator will calculate the weighted average for a company that changes its number of outstanding shares during the course of the time period you are interested in.

Unlike most textbooks that simply limit their examples to number of months, this calculator measures durations in number of days.

Plus, after calculating the weighted average the calculator will generate a line-by-line summary of each transaction.

Note that the results of this calculator are most commonly used for calculating the Earnings Per Share (EPS).

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