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Office Settings & Configuration

How to Stop Excel from Automatically Changing Numbers to 1 Percent

Rana GarciaRana Garcia Sep 25, 2026 869 views

Question details

Users are experiencing an issue where standard numbers entered into cells are automatically reduced to one-hundredth of their value.

How to Fix Excel Automatically Changing Numbers to 1 Percent
Product
Excel for Microsoft 365
Device & OS
Mac
Scenario
Typing standard numeric data or integers into a spreadsheet.
Observed behavior
Excel automatically converts entered numbers to 1% of their intended value (for example, typing 100 results in 1) because an automatic decimal or percentage setting is enabled.
Before you start

Ensure you have saved your current workbook. Be aware that disabling this setting will only apply to future data entries and will not retroactively correct numbers that have already been converted.

Solution 1Recommended

Disable Automatic Decimal Insertion in Excel Preferences

Modifying Excel's editing preferences stops the application from automatically applying decimal places or dividing entered numbers by 100.

Excel has an application-level setting designed to speed up financial data entry by automatically adding decimal points. When accidentally enabled, it causes normal integers to appear as fractions or 1 percent of their original value.

1
Open Excel Preferences

Click on 'Excel' in the top Mac menu bar next to the Apple logo, then select 'Preferences' from the dropdown menu.

2
Access Edit Settings

In the Preferences dialog box, locate and click on the 'Edit' icon under the Authoring section.

3
Disable Automatic Decimals

Find the checkbox labeled 'Display this number of decimal places' or 'Automatically insert a decimal point'. Uncheck this box to disable the automatic conversion.

4
Re-enter the Affected Data

Close the Preferences window. Return to your spreadsheet and manually re-enter the previously affected values to display them correctly.

Disable Automatic Decimal Insertion in Excel Preferences
Existing Data Remains Unchanged: Numbers that were already converted to 1 percent before you changed the setting will remain as they are. You must manually re-enter them or use the Paste Special multiply feature to fix them.
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Frequently Asked Questions

How can I quickly fix the numbers that were already converted to 1 percent?

Type 100 in an empty cell and copy it. Select all the incorrectly converted numbers in your spreadsheet, right-click, choose 'Paste Special', select 'Multiply' under the Operation section, and click OK. This will instantly multiply the selected cells by 100, restoring their original values.

Does this automatic decimal setting apply to all Excel workbooks?

Yes, the automatic decimal insertion is an application-level preference in Excel. Once enabled or disabled in the Mac preferences menu, it universally affects all workbooks opened or created on that specific computer.

Why does Excel have an automatic decimal feature in the first place?

This feature is designed for accountants and users who need to enter large amounts of financial data or percentages rapidly. It allows them to type numbers continuously without manually typing the decimal key for every single entry, though it causes confusion for general use.