Add or Subtract Weeks to a Date in Excel & Google Sheets

This tutorial will demonstrate how to add (or subtract) weeks in Excel & Google Sheets.

Add Weeks to a Date

Excel stores dates as serial numbers; each whole number representing an unique day. That makes adding days to dates incredibly easy. To add weeks to a date, we will add in 7-day increments.

Add 1 Week

This example will add 1 week (7 days) to a date:

=B3+7*1

Add 5 Weeks
This example will add 5 weeks (7*5=35 days) to a date:

=B3+7*5

Subtract Weeks From a Date

We can subtract weeks in the same way.

Subtract 5 Weeks

This example will subtract 5 weeks (7*5=35 days) from a date:

Adding Weeks in Google Sheets

The above examples work exactly the same in Google Sheets as in Excel: