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How to calculate market share in Excel and Google Sheets
Topic:PercentagesExcel & Google Sheets
=B2/SUM($B$2:$B$5)✓
Verified example
Computed by a real spreadsheet engine on the sample data below.
| Company | Sales |
| Alpha Corp | 45000 |
| Beta Ltd | 30000 |
| Gamma Inc | 15000 |
| Delta Co | 10000 |
=B2/SUM($B$2:$B$5)→0.45
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Step by step
- 1List each company in one column and its sales in the adjacent column.
- 2In a Market Share column, type =B2/SUM($B$2:$B$5) for the first company.
- 3Lock the SUM range with $ absolute references.
- 4Press Enter, format the result as a percentage, and copy the formula down for all companies.
Tips
- If the total market figure comes from an external source (not summed from your data), replace SUM($B$2:$B$5) with the cell containing that total, locked with $.
- All market share values should sum to 100% (or 1.0 in decimal). Add a SUM check at the bottom to verify.
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Frequently asked
Can I calculate market share for a single company against an industry total I type in?
Yes — simply replace the SUM formula with the total, e.g. =B2/1000000.
How do I track market share change over time?
Add columns for each time period and calculate share independently per period, then use percentage-difference to measure the share gain or loss.
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