Calendar how-tos
How to Show Week Numbers in Your Outlook Calendar
To show week numbers in Outlook on the web, open Settings, Calendar, View and turn on Show week numbers. In classic Outlook, it is under File, Options, Calendar, Display options. You also choose how week one is counted.
Step by step
- Outlook on the web: open Settings, then Calendar, then View.
- Turn on Show week numbers.
- Choose when the first week of the year starts.
- Classic Outlook: File, Options, Calendar, then tick Show week numbers in the Month view and Date Navigator.
Good to know
- Most of Europe uses ISO weeks: choose First 4-day week.
- The US usually counts from the week holding January 1.
- Not sure what week it is? See the current week number.
Source
This guide follows Microsoft Support. Menus change now and then, so check there if a button has moved.
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