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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.
Need it for your exact data?
Describe your columns in plain English and get the precise formula for your sheet, with the right Excel or Sheets syntax.
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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