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Herfindahl-Hirschman Market Concentration Calculator — result sheet
Calculate a partial-market HHI from entered percentage shares, including an explicit other-firms share.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: HHI = Σ market-share percentage²; the entered shares should represent the whole market, including other firms.
Squaring each share gives larger firms more weight and produces an index from 0 to 10,000 when percentages sum to 100.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Firm 1 share — %; minimum 0; maximum 100
- Firm 2 share — %; minimum 0; maximum 100
- Firm 3 share — %; minimum 0; maximum 100
- Firm 4 share — %; minimum 0; maximum 100
- Firm 5 share — %; minimum 0; maximum 100
- Other firms share — %; minimum 0; maximum 100
Worked example
| Input | Value |
|---|---|
| Firm 1 share | 50 |
| Firm 2 share | 25 |
| Firm 3 share | 15 |
| Firm 4 share | 5 |
| Firm 5 share | 3 |
| Other firms share | 2 |
HHI = 3,388 with total share 100%.
Assumptions and limits
- All shares use the same market definition, period, and geographic scope.
- The other-firms field is explicit so omitted firms are not silently treated as zero.
- Legal merger thresholds, market definition, entry barriers, and enforcement conclusions are not inferred.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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