Type the numbers you want to calculate, along with the appropriate mathematical operators.
Word can calculate numbers in a line, in a column or row in a table, or in a column separated from other columns with tabs. Word can also calculate numbers interspersed throughout the text in one or more paragraphs if you include a space on either side of each number.
Select the numbers and operators.
From the Tools menu, choose Calculate.
Word calculates the result and displays it for a few seconds in the status bar. The result is stored on the Clipboard.
To insert the result into your document, position the insertion point and choose Paste from the Edit menu (CTRL+V) or click the Paste button on the Toolbar.
This is left over from the halcyon days of Word 2.0 when Woody Leonard and Ed Bott were but children.
Click the Office logo
Go to Word Options on the bottom of the box.
Go to Customize.
Select All Commands and find Calculate.
The Calculate icon will now appear on the Quick Access toolbar.