Microsoft Word isn't typically the first choice for crunching numbers—that's Excel's domain. Yet, as someone who's managed countless documents with tables over years of professional use, I've found Word's built-in tools surprisingly capable for basic calculations. No need to switch apps or grab a calculator mid-document.
5+ Cross-Platform Excel Alternatives for When You're Out of the Office. Be honest: how often do you hunt for a calculator when faced with a table of figures? It doesn't have to be that way. Here's how to easily sum rows in a Word table.
Word's math functions work only within tables—regular text won't cut it. Go to Insert > Table and choose your grid size, or paste from Excel. Leave space for your sum in the final cell.

Your table should look like this:

Click inside the table to reveal the contextual Table Design and Table Layout tabs at the top. Switch to the Layout tab.

Position your cursor in the cell where you want the sum to appear.
On the Layout tab, click Data > Formula in the ribbon.

For a basic sum, accept the default (=SUM(ABOVE)) and click OK. Word calculates automatically.

Polish with table styles, and you're set.

Handy trick, right? Also check out this trick to improve table positioning in Word. What other Word features surprise you? Share in the comments.