HHI Calculator (Herfindahl-Hirschman Index)
FinanceCalculate the Herfindahl-Hirschman Index (HHI) to measure market concentration based on the market shares of the top firms in an industry.
HHI
Sum of squared market shares (as whole-number percentages)
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Frequently Asked Questions
How is the HHI scored?
HHI ranges from near 0 (many small competitors) up to 10,000 (a pure monopoly). US antitrust guidelines generally treat markets above 2,500 as highly concentrated.
What HHI level triggers antitrust concern?
In the US, an HHI above 2,500, or a merger that increases HHI by more than 200 points in an already concentrated market, is likely to draw closer antitrust scrutiny.
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