While editing a formula, this shortcut toggles cell references from relative to absolute, to partially absolute, back to relative again: A1 --> $A$1 --> A$1-- > $A1-- > A1 This is much faster and easier than typing the $ character manually. To convert an existing formula, enter cell edit mode, place the cursor in or next to the reference you'd like to convert, then use the shortcut. Note: In earlier versions of Excel on the Mac, this shortcut is exclusively Command + T. In Mac Excel 365, fn + F4 also works, inline with the Windows version of Excel.