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What people call syncing is nearly always a booking page that needs to see two calendars, and sharing does that in minutes without copying anything.
Sync two Google calendars: what sharing does, what subscribing does, and what neither does
The request usually arrives as a booking problem. An agency owner keeps a personal calendar in one Google account and a work calendar in another, or a client’s team each has their own, and the booking page keeps offering slots that are already taken on the calendar it cannot see. The word people reach for is sync, but what they nearly always need is not two calendars holding the same events. They need one place that can see both, and a booking calendar that checks both before offering a time. Google gives you three ways to get there without any extra tool, and each one shows the other account something different.
The methods, side by side
| Method | What the other account gets | Direction | How fresh | Best for |
|---|---|---|---|---|
| Share the calendar with a specific account | The same calendar in its list, at the permission you chose | One calendar, two viewers | Immediate | Conflict checking and team visibility |
| Subscribe by the calendar’s address | A read-only copy | One way | Refreshes on Google’s schedule, hours rather than minutes | Calendars that live outside Google |
| Invite your other address to each event | A real copy of that one event | Per event, by hand | Immediate | A handful of events that must appear in both |
| A third-party sync tool | Mirrored copies, kept matched | Two way | Minutes | When both calendars genuinely need to hold events |
Sharing: one calendar, two accounts looking at it
Sharing is the method that solves the booking problem, and it is worth being precise about what it does. In the calendar’s settings you name another Google account and choose what it may see: free and busy only, every event’s details, or the right to change events. The calendar then appears in the other account’s list, under other calendars, as itself rather than as a copy. An event added in either account shows in both at once because there is only one calendar. Nothing has been synchronised; a second viewer has been let in.
Choose free and busy where you can
For a booking tool, free and busy is all that matters, and it is the permission to prefer when the calendar being shared is personal or belongs to a client. The work account then sees blocks with no titles, which is exactly enough to stop a double booking and nothing more. Full detail is for a colleague who needs to know what the meeting is; change rights are for someone who books on your behalf.
Where sharing is blocked
A Google Workspace organisation can forbid sharing calendars outside itself, or limit outside sharing to free and busy. If the share option is missing, or the invited account never receives the calendar, that policy is the usual reason, and the fix is with the administrator rather than in the calendar. A personal Gmail account has no such restriction.
Subscribing: a copy that arrives late
Every Google calendar also has an address, and any calendar application can subscribe to it, including another Google account. What arrives is a read-only copy that Google refreshes on its own schedule, which can be many hours behind. That delay makes it the wrong method for availability: a slot booked this morning may still look free in the subscribed copy this afternoon. It is the right method for a calendar that does not live in Google at all, such as a client’s practice management system, where a slow copy beats no visibility.
What the booking calendar actually needs
A booking calendar does two separate things with Google. It writes each new booking to one calendar, and it reads a set of calendars for busy time before offering a slot. Most booking tools, including the one inside an agency CRM, connect a single Google account and then let you tick which of that account’s calendars count for conflicts. Once the personal calendar is shared into the work account, it is in that list and can be ticked. No sync has happened; the booking page simply checks two calendars instead of one. The rules for hours, buffers and notice sit on top of that, which is the subject of setting up the calendar schedule, and the choice of which calendar receives the booking is part of setting up a calendar clients can book into.
One writer, many readers
Keep a single calendar as the destination for bookings, and let every other calendar be read only. Two writable destinations is how the same appointment ends up in both, and two conflict calendars that are copies of each other block the same hour twice, which is harmless but confusing when the calendar looks fuller than it is.
When you genuinely need both calendars to hold events
Some situations do need a real copy in each place: a personal account that must show work bookings so a family member can see them, or two people who each own a calendar and both need a shared set of appointments as their own. For a few events, inviting the other address as a guest creates a genuine copy that stays in step when the event moves. For many, only a sync tool will do, and the thing to check before choosing one is how it handles deletions and edits made on the copy, because a mirror that only copies forward quietly turns one calendar into the truth and the other into a stale view.
Time zones and the person who leaves
Two calendars in two accounts can sit in two time zones, and a shared calendar is shown in the viewer’s zone, not its owner’s. For a booking page that is usually what you want, but check it once with a test booking rather than assuming. And a calendar shared from a person’s own account leaves with that person: when a team member goes, the calendars they shared into the work account go dark, which is one of the lines in an offboarding checklist. Calendars the business depends on should be owned by a business account and shared outward, never the other way round.
A short procedure
- Decide which single calendar receives bookings.
- From each other account, share its calendar into the work account with free and busy permission.
- In the booking tool, tick each shared calendar as a conflict calendar, and confirm the destination calendar is the one you chose.
- Make a test booking, then add a personal event at the same time from the other account and confirm the slot disappears from the booking page.
- Check that the appointment reminder automation still fires from the destination calendar, and that appointment statuses still update there, since both depend on the booking landing where the automation expects it.
Frequently Asked Questions
Can two Google calendars be synced without a third-party tool?
Not as mirrored copies, but usually you do not need that. Share one calendar into the other account and both accounts see the same calendar at once. For a few events that must exist in both, invite your other address as a guest. Only a genuine two-way mirror of many events needs a sync tool.
What is the difference between sharing and subscribing?
Sharing lets a named account view the same calendar, at a permission you choose, with changes visible immediately. Subscribing by the calendar’s address gives a read-only copy that Google refreshes on its own schedule, often hours behind, so it is unsuitable for checking availability.
Why does a subscribed calendar show old availability?
Because a subscription is a copy refreshed on Google’s timetable rather than a live view. A booking made this morning can still look free in the copy this afternoon. For availability, share the calendar into the account instead and tick it as a conflict calendar in the booking tool.
Which permission should I use to share a personal calendar with a work account?
Free and busy only. The work account then sees blocks without titles, which is enough to prevent double bookings and reveals nothing about the events. Give full detail only to a colleague who needs the content, and change rights only to someone who books on your behalf.
How does a booking calendar check two Google calendars?
It connects one Google account and lets you tick which of that account’s calendars count as conflicts. Share the second calendar into the connected account and it appears in that list. The booking is still written to a single destination calendar; the others are only read for busy time.
Why is the share option missing from my calendar?
A Google Workspace administrator can forbid sharing outside the organisation or limit it to free and busy. If the option is absent or the invited account never receives the calendar, that policy is the usual cause and only the administrator can change it.
Should bookings be written to both calendars?
No. Keep one calendar as the destination and let every other calendar be read only. Two writable destinations produce the same appointment twice, and reminders and status updates should run from the one calendar the automation expects.
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