Herfindahl-Hirschman Index (HHI) Calculator

Industry Name (Optional): Name of the market/industry for context.

Input Method: Choose to enter direct market shares or revenues to calculate shares. Direct Market Share (%) Firm Revenues

Currency (for Revenue): Select if inputting revenues. Not used for direct % share. $ USD € EUR £ GBP ¥ JPY ₹ INR None

Total Market Revenue: Required if inputting firm revenues to calculate shares.

Market Participants

Click "Add Firm" to start.

HHI Result

HHI Value:

Market Concentration:

Market Share Distribution

HHI Interpretation Guide

• HHI < 1500: Unconcentrated Market (Competitive)
• 1500 ≤ HHI ≤ 2500: Moderately Concentrated Market
• HHI > 2500: Highly Concentrated Market

The HHI is calculated by squaring the market share of each firm competing in a market and then summing the resulting numbers. Market shares are expressed as percentages (e.g., 30 for 30%).