Adding a second account to Google Calendar

There are two different things people mean when they ask how to add another account to Google Calendar. The first is signing in to a second Google account in the same browser so it can be reached without logging out. That takes about a minute: click the profile picture at the top right of any Google page, choose Add account, and sign in. The second is getting the events from both accounts into one calendar grid, so a work meeting and a dentist appointment can never overlap without anyone noticing. Adding the account does not do that. It only gives the browser a second, separate calendar to switch to.

This guide covers both. It starts with the sign in steps exactly as Google documents them, explains why the switcher leaves the two calendars apart, and then walks through the three ways to merge them into one view on a Mac: sharing one calendar into the other account, adding both accounts to a desktop calendar, and subscribing by a private address. All the menu names below were checked against Google and Apple help pages on October 18, 2026.

Step one: sign in to the second account in the browser

Google's own help page, Sign in to multiple accounts at once, gives the steps for a computer:

1. Open any Google page, such as calendar.google.com, while signed in to the first account.
2. At the top right, select the profile image or initial.
3. In the menu, choose Add account.
4. Follow the prompts to sign in to the second account.

From then on, the same profile menu lists both accounts, and selecting one opens that account's version of Google Calendar.

Two details on that help page explain most of the odd behaviour people run into later. First, each account keeps its own settings. Language, time zone, notification defaults and working hours are stored per account, so the second calendar can look and behave differently from the first. Second, Google describes a default account, which is usually the one signed in first. When a new browser window opens and Google cannot tell which account was intended, it falls back to the default. That is why a link from an email sometimes opens in the wrong account, and why a new event created in a fresh tab can land on the calendar nobody meant to use.

To stop using the second account in that browser, the same menu offers Sign out of all accounts, and the account page has a Remove an account option. Removing it there only clears the sign in from the browser. It does not delete the account or any events.

On a phone, the Google Calendar app has its own account switcher, described in Switch between accounts in the Google Calendar app. The phone app can display calendars from several accounts in one grid if they are all turned on in the side menu, which is a useful reminder that the problem is mostly a desktop browser problem.

Why the switcher does not merge the two calendars

After the second account is added, the browser holds two complete copies of Google Calendar. Each has its own left column, its own colours, and its own default calendar for new events. Switching takes two clicks, and the grid only ever shows one account at a time.

For someone who checks the second account once a week, that is fine. For someone who books meetings across both every day, it is the source of the double booking. A schedule that has to be switched to stops being looked at. The meeting request arrives in the work account, the free slot looks open, and the school pickup sitting in the personal account is not on screen.

So the useful question is not how to add the account, but which of these two outcomes is needed:

What is needed	What solves it	Effort
Reach the second account without signing out	Add account in the profile menu	One minute
See both accounts' events in one grid	Share one calendar into the other account	Five minutes, per calendar
See and edit both from one desktop app	Add both accounts to a Mac calendar app	Five minutes, once
Read only copy of one calendar elsewhere	Subscribe by the secret iCal address	Two minutes, read only

The rest of this guide covers the last three rows.

Option one: share the second calendar into the first account

This route keeps everything inside Google Calendar on the web. One account shares its calendar with the other, and the shared calendar then appears in the first account's left column under Other calendars, overlaid on the same grid.

The steps from Google's Share your calendar help page, done while signed in to the account that owns the calendar:

1. In Google Calendar, find the calendar under My calendars on the left.
2. Next to it, click More, then Settings and sharing.
3. On the left, click Shared with, then Add people and groups.
4. Enter the email address of the other account.
5. Choose a permission level and click Send.

The other account receives an email and has to click the link inside it before the calendar shows up. If the email does not arrive, Google suggests checking spam and trash, or removing and re-adding the address.

Picking the right permission

Google offers five levels, and the choice decides what is actually possible from the other account:

• See only free/busy (hide details): shows blocks of busy time with no titles. Good for keeping work private while still avoiding clashes.
• See event details: titles, times, places and descriptions are visible, nothing can be edited.
• Make changes (see private events as free/busy): non-private events can be edited.
• Make changes and see event details: full editing, plus visibility of who else the calendar is shared with.
• Make changes and manage sharing: full control, including sharing the calendar further.

For one person with two accounts, Make changes and see event details is the practical choice, because it allows moving an event from either side. The catch is the warning at the top of the same help page: on a work or school account, the administrator decides whether a calendar can be shared outside the organisation at all. If the Shared with section is missing or greyed out, that is a policy, not a bug, and the next option is the way around it.

Option two: add both accounts to a desktop calendar on the Mac

Most desktop calendar apps can sign in to more than one Google account and show every calendar from all of them in one grid. Because each account is connected directly, nothing has to be shared between them, so work policies on outside sharing do not get in the way.

With the Calendar app that ships with macOS

Apple's guide, Add calendars and calendar accounts on Mac, describes it this way:

1. Open the Calendar app.
2. Choose Calendar > Add Account.
3. Select Google, click Continue, and sign in through the browser window that opens.
4. Repeat for the second account.

Each account appears as its own section in the sidebar. If the sidebar is hidden, View > Show Calendar List brings it back. Every calendar has a checkbox, so a single grid can hold the work calendar, the personal calendar and a shared family calendar at once, each in its own colour.

Google confirms this works in Sync your calendar with computer programs, which describes adding a Google account to another calendar application through Sign in with Google so events can be added and edited from either side.

Things to check after connecting

The connection is not the end of the setup. Three settings decide whether the merged view actually prevents mistakes:

• The default calendar for new events. In a merged grid, a quick new event goes wherever the default points. Set it to the account used most, or the personal dinner will end up visible to colleagues.
• Colours. Give each account a clearly different colour family, so the account an event belongs to is obvious without opening it.
• Duplicates. If a calendar was already shared from one account to the other in option one, it now appears twice: once directly and once as a shared calendar. Untick one of them.

Option three: subscribe with the secret address for a read only copy

When editing is not needed, Google provides a private iCal link for each calendar. Open Settings, choose the calendar by name in the left column, click Integrate calendar, and copy the Secret address in iCal format. That address can be pasted into another calendar app, or into the other Google account through Other calendars, then From URL.

Two warnings from Google's help apply. The secret address gives anyone who has it full read access, so it should never be pasted into a shared document. If it leaks, the Reset button issues a new address and kills the old one. And a work or school administrator can turn the secret address off, in which case it simply is not shown.

Subscriptions are also slow to refresh compared with a direct account connection, and Google notes that adding a calendar this way requires a computer browser; the phone apps cannot subscribe. Google's subscription help page adds that performance can suffer above 400 subscribed calendars, which is not a limit anyone with two accounts will reach. Use this route for a calendar that only needs to be glanced at, such as a partner's shifts or a team's on call rota.

Choosing between the three on a Mac

The right answer depends mostly on where the events are created and who controls the account.

If both accounts are personal and the browser is where the day is planned, option one is enough. Sharing a calendar from one account into the other takes five minutes and needs no new software.

If one account belongs to an employer that blocks sharing outside the organisation, option two is the reliable route, because the Mac signs in to each account directly. It also removes the browser tab entirely, which matters for people who keep the calendar open all day.

If the second calendar is someone else's and only needs to be seen, option three keeps it out of the way while still showing it.

For people already living in a desktop calendar, the choice of app makes a difference too. A native Mac calendar that connects several Google accounts side by side, lets the user pick which calendar new events go to, and can show all accounts at once or one at a time covers the whole of option two in one place. The guide for one such app walks through the Add account step in the sidebar, and its features page lists multiple accounts alongside natural language entry and travel time. The free version keeps as many Google accounts connected as needed, so the merged view does not depend on a subscription.

What to change first

Add the second account in the profile menu only if reaching it is the whole problem. If the goal is to stop double booking, connect both accounts to one desktop calendar or share one calendar into the other, then set the default calendar for new events before doing anything else. Caltimate is one Mac calendar built around that setup.