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Market Share Calculator

Calculate your market share from your sales and total market sales (revenue or units), your relative market share against the largest competitor, and how much sales each extra point of share is worth.

Measure sales in

Your sales

Total market sales

Largest competitor's sales

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How it works

Market share = your sales ÷ total market sales × 100 · Competitor share = competitor sales ÷ market × 100 · Relative market share = your sales ÷ largest competitor's sales · Sales per share point = total market ÷ 100

Market share is your slice of all sales in a defined market over the same period — by revenue (value share) or by units (volume share). Defining the market carefully matters more than the arithmetic: the same company can hold 2% of "beverages" and 40% of "cold brew in one city". Relative market share compares you with the largest rival and is the axis of the BCG growth-share matrix: above 1 you are the leader. Market totals usually come from industry associations, government statistics or research firms.

Worked example

A company with $2.5 million of sales in a $20 million market has a market share of 2,500,000 ÷ 20,000,000 = 12.50%. Its largest competitor sells $5 million (25.00%), so relative market share is 0.50× — a challenger. Each extra point of share is worth $200,000 in sales.

Sources: Wikipedia — Market share · BCG — The growth-share matrix

Frequently asked questions

How do you calculate market share?

Divide your sales by the total sales of the market in the same period and multiply by 100. $2.5 million out of $20 million is 12.5%.

What is relative market share?

Your sales divided by the sales of your largest competitor. 0.5 means the leader is twice your size; above 1 means you are the leader. It is used in the BCG growth-share matrix.

Should I use revenue or units?

Revenue (value) share shows who earns the money; unit (volume) share shows who sells the most items. Premium brands often have a higher value share than volume share. Report which one you use.

Where do I find total market size?

Industry associations, government statistics (census and trade data), listed competitors' reports and paid research. You can also build it bottom-up — customers × spend per customer — with a TAM SAM SOM calculation.

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This calculator is for educational purposes. Double-check important results before acting on them.