HHI Calculator

Calculate Herfindahl-Hirschman Index for market concentration and competition analysis

✓ Market Analysis ✓ Competition Assessment ✓ Antitrust Analysis

HHI Calculator

Market Information

Company Market Shares

Company 1

Company 2

Company 3

Company 4

Others (Combined)

Analysis Options

About HHI

HHI measures market concentration by summing the squares of market shares of all firms

HHI Formula:

HHI = Σ(Si²)
Where Si is the market share of firm i

HHI Thresholds

Competitive: < 1,500
Moderately Concentrated: 1,500 - 2,500
Highly Concentrated: > 2,500
Monopoly: 10,000

Regulatory Guidelines

DOJ/FTC (US):
• < 1,500: Unconcentrated
• 1,500-2,500: Moderate
• > 2,500: Concentrated
EU Guidelines:
• Similar thresholds
• Additional factors considered

Quick Examples

Competitive Market
5 equal competitors
HHI: 2,000
Concentrated Market
2 dominant players
HHI: 5,000+

HHI Applications

Antitrust: Merger review and approval
Competition: Market structure analysis
Strategy: Competitive positioning
Research: Industry concentration studies
Policy: Regulatory decision making
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How to Use

  1. Enter market/industry name and analysis period
  2. Add companies and their market shares (as percentages)
  3. Ensure market shares sum to approximately 100%
  4. Select calculation method and analysis depth
  5. Calculate to see HHI and concentration analysis
  6. Review regulatory implications and recommendations

Understanding HHI

Low HHI (< 1,500)

Competitive market with many players and low concentration.

Moderate HHI (1,500-2,500)

Moderately concentrated market requiring regulatory attention.

High HHI (> 2,500)

Highly concentrated market with potential antitrust concerns.