Office Settings & Configuration

How to Fix Excel R1C1 References and Function Keys on iMac

Tauseeq MagsiTauseeq Magsi Oct 10, 2026 870 views

Question details

The user needs to revert Excel formula references from the R1C1 format back to the standard A1 format and restore the functionality of function keys on an iMac.

How to Fix Excel R1C1 References and Function Keys on iMac
Product
Microsoft Excel for Mac
Device & OS
macOS
Scenario
Reviewing or editing formulas in an Excel workbook on an iMac.
Observed behavior
Formulas are displaying as SUM(R[-8]C:R[-1]C) instead of standard cell references like A1 or B2, and the Mac function keys do not respond as expected in the application.
Before you start

Ensure your macOS and Excel application are updated to the latest versions to rule out software bugs, and verify that your iMac keyboard is functioning correctly in other applications.

Solution 1Recommended

Disable R1C1 Reference Style in Excel Preferences

Use this method to switch your Excel formulas back to the standard A1 cell reference style.

The R1C1 reference style is often triggered by opening a specific workbook that was saved with this setting enabled. You can easily toggle it off in the application preferences.

1
Open Excel Preferences

Open the Excel application on your iMac. Click on 'Excel' in the top-left corner of the macOS menu bar and select 'Preferences' from the dropdown menu.

2
Access Calculation Settings

In the Excel Preferences window, look under the 'Formulas and Lists' section and click on the 'Calculation' icon.

3
Uncheck R1C1 Reference Style

Locate the checkbox labeled 'Use R1C1 reference style' and clear it. Close the Preferences window, and your formulas will immediately revert to the standard A1 reference style.

Disable R1C1 Reference Style in Excel Preferences
Setting Applied: Your column headers should now display as letters (A, B, C) instead of numbers (1, 2, 3).
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Frequently Asked Questions

What is the difference between R1C1 and A1 reference styles in Excel?

The A1 reference style labels columns with letters (A, B, C) and rows with numbers (1, 2, 3), making cell A1 the top-left cell. The R1C1 style uses numbers for both rows and columns (e.g., R1C1 stands for Row 1, Column 1), which is useful for complex macro programming but often confusing for standard data entry.

Why did my Excel suddenly change to the R1C1 reference style?

This typically happens if you open a workbook that was previously saved with the R1C1 reference style enabled. Excel temporarily adopts the settings of the active workbook, which can sometimes persist until manually disabled in the application preferences.

Can I permanently set function keys to work only in Excel on my Mac?

macOS does not natively allow you to set the function keys to behave as standard keys for only one specific application. You either have to change the global setting in System Settings > Keyboard or hold the 'Fn' (or Globe) key whenever you want to use a function key in Excel.