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Office for Mac Issues

How to Fix Excel for Mac Using a Comma Instead of a Period

Maira MehtabMaira Mehtab Sep 27, 2026 869 views

Question details

The user needs to change the decimal or list separator in Excel for Mac from a comma to a period, but the changes do not seem to take effect.

Product
Excel for Mac
Device & OS
macOS
Scenario
Modifying the decimal and list separator preferences in Excel settings.
Observed behavior
Excel continues using a comma as the decimal or list separator even after system separators are disabled and a period is explicitly selected in Excel settings.
Before you start

Ensure you have saved all your open workbooks before making changes to system or application regional settings, as a full restart of the application is required to apply the changes.

Solution 1Recommended

Restart Excel to Apply Separator Changes

The most common reason for this issue is that the application hasn't fully registered the new settings. Restarting Excel usually resolves the conflict.

Excel for Mac requires a complete application restart to apply modifications made to the 'Use system separators' setting.

1
Adjust Excel Preferences

Open Excel for Mac, navigate to 'Excel' in the top menu bar, and click 'Preferences'. Select 'Edit', uncheck 'Use system separators', and manually set the Decimal separator to a period (.).

2
Quit the Application

Completely quit Excel by pressing Cmd + Q on your keyboard or clicking 'Excel' in the top menu bar and selecting 'Quit Excel'.

3
Reopen and Verify

Launch Excel again and open a blank workbook to verify that the period is now correctly used as the decimal separator.

Quick Fix: In most cases, a simple quit and relaunch directly after changing the preferences is all that is needed.
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Frequently Asked Questions

Why does Excel default to a comma instead of a period for decimals?

Excel typically inherits its number formatting from your operating system's regional settings. Many European and South American countries use a comma as a decimal separator by default.

Can I change the separator for a specific workbook only?

No, separator settings in Excel for Mac apply globally to the entire application. However, you can change the custom cell formatting rules for specific cells if you need a particular visual display.

Where do I find the separator settings in Excel for Mac?

You can find these settings by clicking 'Excel' in the top Apple menu bar, selecting 'Preferences', clicking on 'Edit', and looking for the 'Use system separators' checkbox.