How to show an Outlook calendar in Google Calendar.
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Having multiple calendars with different appointments on each one is a sure way to double bookings and an argument with someone you’ve annoyed. Be more organized and confident by signing up for your Outlook Calendar in Google Calendars.
To do this, you’ll need Outlook and a Google Calendar (which is pretty obvious), but you won’t need third-party plugins, add-ons, extensions, or tools.

Both Microsoft and Google support the iCal format, which is short for “iCalendar.” It’s an open standard for exchanging calendar and scheduling information between users and computers that’s been around since the late 1990s. This means you can subscribe to iCals if you have the right link, which is the method we’ll use here.
Since we’re going to display an Outlook calendar in Google Calendar, we first need to get the Outlook calendar link. In previous iterations of Outlook, it was possible to publish your calendar from the Outlook client on your laptop, but since the introduction of Office 365, Microsoft has only allowed you to share a calendar with people outside of your organization using the Outlook Web App.

Sign in to your and navigate to Outlook by clicking the app launcher (the nine dots in the upper left corner) and selecting the Outlook icon.
Click Settings > View all Outlook settings.

Open Calendar > Shared Calendars.
In the “Publish a calendar” section, choose the calendar you want to share (if you only have one calendar set up, it will be called “Calendar”), select “Can see all details” in the second dropdown menu, and click “Publish” .

This will create two links: an HTML link and an ICS link. The HTML link allows people to view your calendar in a browser and the ICS link will allow people to import your calendar into their calendar program.
Click on the ICS link and a menu will appear. Select the “Copy Link” option to copy the link to your clipboard.
Add Outlook calendar to Google Calendar
Open and click the “+” sign next to “Other Calendars.”

In the menu that appears, click “From URL”.
Paste the ICS link you copied from Outlook and click “Add Calendar”.
Exit Settings and verify that the calendar has been added.

The calendar will sync with your Outlook calendar as long as you stay subscribed. Changes to your Outlook calendar can take a few minutes to be reflected in Google Calendar (or it can be almost instantaneous, depending on when Google checks for new information), but your Outlook events should show up fairly quickly.
Customizing the appearance of the calendar
Your calendar is now in sync, but to make things a bit easier to use, you can change the display name from the useless “Calendar” to something else.
First, hover over the calendar, click on the three dots next to it, and click on “Settings”.
In the “Name” text box at the top of the page, change the name of the calendar to something more meaningful. Then click the back arrow at the top left to exit Settings.

The calendar now shows your new name.
Delete a Google Outlook calendar
If you hover over the calendar, an “X” will appear. Clicking this will unsubscribe you from the calendar. You will need to repeat these steps and re-enter the ICS URL to sign up again.