What changed: steps that look different now show our own iPhone 14 Pro on iOS 27.0.1, with the wording checked against that screen.

howtosimply.com/guides/how-to-show-week-numbers-in-the-calendar-on-an-iphone/ · Checked October 2026 · iPhone 14 Pro · iOS 27.0.1

In this guide

Open Settings and tap Apps
Tap Calendar
Switch on Week Numbers
Look at the switch below it
Good to know
Sources

Quick answer

Open Settings, tap Apps, then Calendar, and switch on Week Numbers. The Calendar then displays the week number next to every week of the year. The switch is off at first. The setting is in the Settings app, not in the Calendar app itself.

2 of 4 steps with real screenshots · 1 official source below

Device: iPhone
Shown on: iOS 27.0.1 (iPhone 14 Pro)
App: Settings
Path: Settings › Apps › Calendar
Real screenshots: 2 of 4 steps
Checked: October 2026
Sources: 1 official, linked below

Step by step

Open Settings and tap Apps
Apps is near the bottom of the main Settings list. On iOS 17 and earlier, Calendar is in the main list itself.
Done
Tap Calendar
The apps are in alphabetical order, so Calendar is near the top, under C.
Done
Switch on Week Numbers
It is in the group below Language, after Time Zone Override and Alternative Calendars.
Done
Look at the switch below it
Week View Starts On Today is the next row and is also off at first. Switched on, it shows the current day as the first day in Week view.
Done

What changed: steps that look different now show our own iPhone 14 Pro on iOS 27.0.1, with the wording checked against that screen.

About this guide

Many workplaces plan by week number: delivery in week 42, holiday in week 31. The iPhone Calendar can show these numbers, but the switch is off when the phone is new and it is not inside the Calendar app.