Unless revenues are measured against the overall markets a company sells into, how much it sells in dollars or units per month, per quarter or per year does not necessarily accurately reflect its economic health or future viability.

A company’s total sales compared to the total sales of all its direct competitors defines market share. The market share formula looks like this: A company’s total revenues is divided by total sales by all direct competitors in a certain market or markets, usually within a certain geographic area, by month, by quarter and/or by year and is converted into a market share percentage (Company revenues/Market sales = Market Share Percentage).

Though most industries measure business market size in dollars by multiplying units sold times the selling price, some industries measure market size by units sold or by the number of transactions reported.

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