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This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.
How it is calculated
Market share = company sales ÷ total market volume × 100%. Sales can be measured in money or in units — what matters is using the same unit for the company and the market, or the result is meaningless.
The result is only as accurate as the "total market" estimate — and that's almost always an estimate, not a precise measurement, usually sourced from industry research with its own margin of error. The full market size is rarely known precisely by anyone.
Where the market's boundary sits is a matter of judgment, not fact: whether to count adjacent product categories as competitors, whether to include neighboring regions — these choices shift the denominator, and the result along with it. Market share is more useful as a trend indicator (is the company growing faster or slower than the market) under a consistent market definition than as a one-off precise number.