Alt M U S on Mac: Sum in Excel
To run Sum with Alt M U S in Excel on a Mac, install LightningXL, tap Option, then type M, U, S. The same keys as Windows, with the same result.
Step by step
Install LightningXL
Download LightningXL, then follow the instructions. Setup takes about two minutes.
Select what to act on
Click a cell, or select the range the command should apply to.
Tap Option, then type M U S
Tap ⌥ on its own to show the keytips, then M for Formulas, U for AutoSum, S for Sum.
What Alt M U S does
Sum sits under Formulas › AutoSum on the Excel ribbon. On Windows, Alt M U S runs it from the keyboard. Excel for Mac has the same ribbon but no Alt key, so without LightningXL you click through Formulas › AutoSum › Sum instead.
Related shortcuts
The rest of the AutoSum menu in Excel:
Every Windows shortcut you know, on your Mac
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