Concentration Ratio Calculator
The Concentration Ratio (CR) is a widely used economic metric to measure the market share held by the largest firms within an industry. Usually, the sum of the market shares of the top 4 or 5 firms is calculated to assess how concentrated or competitive a market is.
Our Concentration Ratio Calculator helps you quickly compute the CR5 — the total market share of the five largest firms — to understand market structure and competition level.
📊 What Is Concentration Ratio?
The Concentration Ratio reflects the extent to which a small number of firms dominate the total market. A high concentration ratio indicates an oligopoly or monopoly-like market, whereas a low ratio suggests a more competitive market.
📈 Concentration Ratio Formula
Concentration Ratio (CR5) = Sum of Market Shares of Top 5 Firms
Expressed as a percentage, this ratio sums up the market shares of the largest five firms in an industry.
🧮 How to Use the Concentration Ratio Calculator
- Enter the market shares (in percentage) of the top 5 firms in the market.
- Click “Calculate” to get the Concentration Ratio.
- The result shows the combined market share of these firms.
💡 Example Calculation
Suppose:
- Firm 1 Market Share = 30%
- Firm 2 Market Share = 25%
- Firm 3 Market Share = 15%
- Firm 4 Market Share = 10%
- Firm 5 Market Share = 5%
Concentration Ratio (CR5) = 30 + 25 + 15 + 10 + 5 = 85%
An 85% concentration ratio indicates a highly concentrated market dominated by the top 5 firms.
📌 Why Concentration Ratio Is Important
- Market Structure Analysis: Helps classify markets as competitive, oligopolistic, or monopolistic.
- Antitrust & Regulation: Used by regulators to assess market power and competition.
- Strategic Business Decisions: Firms analyze concentration to identify opportunities and threats.
🛠️ Related Metrics
- Herfindahl-Hirschman Index (HHI): Another concentration measure accounting for all firms’ market shares.
- Market Share: Individual firm’s percentage of total sales.
❓ FAQs
1. What is a high concentration ratio?
A CR5 above 60-70% is usually considered highly concentrated.
2. Can the concentration ratio exceed 100%?
No, total market share cannot exceed 100%.
3. What if the total market shares entered are less than 100%?
It means smaller firms share the remaining market.
4. How many firms should I include in the concentration ratio?
Typically the top 4 or 5 firms are used (CR4 or CR5).
5. Is a low concentration ratio better?
A low CR indicates a competitive market with many players.
✅ Conclusion
The Concentration Ratio Calculator is an essential tool for economists, marketers, and regulators to understand market competitiveness. By calculating the combined market share of the largest firms, you can identify market dominance and make informed strategic decisions.