Individual and Team plan users can add unlimited calendars to their account. You can always upgrade your account by visiting your Subscription settings on

To add a new calendar to your account, you can visit Select Google, Office 365, or and follow the authorization steps, which are the same as when you first signed up for

When you add multiple calendars, like your work and personal calendars, is able to consider your availability across those calendars. 

You can view your Connected Calendars in your Account settings.

More resources:
I can't connect my calendar on
What information can Amy and Andrew see from my connected calendar?

Amy/Andrew lost access to my calendar

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