A family of Microsoft word processing software products for creating web, email, and print documents.
Select File > Options.
Select Customize Ribbon in the navigation pane.
Click the Customize... button next to Keyboard shortcuts, near the bottom of the dialog.
Scroll down the list of Categories and select Commands Not in the Ribbon.
Scroll down the list of Commands and select ToolsCalculate.
Click in the Press new shortcut key box.
Press Alt+=
Click Assign.
Click Close, then OK.
If Word asks you to save changes to the default template Normal.dotm when you quit Word, click Yes.