Sync multiple Google calendars

Start with the calendar that needs your availability

If you only want one place to read your schedule, sharing may be enough. In Google Calendar on a computer, open a calendar's Settings and sharing, add the other account under Shared with, and choose its permission level. Accept the invitation from that account. Work or school policies may restrict sharing. Google's sharing instructions cover the available permissions.

That gives the other account access to a calendar. It doesn't create a managed copy of every event in its primary calendar. Check which calendars your booking service or colleagues actually use to assess availability before adding a sync tool.

Give each original event a direct route

Take an illustrative setup: a personal Google account, Client A's Workspace account, and Client B's Workspace account. You want both clients to see when you're busy, without seeing one another's meeting details.

• Personal → Client A and Client B: private busy blocks.
• Client A → Personal and Client B: private busy blocks, or full details only on a personal calendar you're permitted to use.
• Client B → Personal and Client A: private busy blocks.

A copied event isn't used as a new source. So Client A → Personal → Client B won't relay Client A's copies onward. Add the direct Client A → Client B direction if that availability belongs there. If you only need a personal overview, use the two client-to-personal directions and stop there.

Connect the accounts, then create the rules

1. Open Calendars in Sync My Cal and connect each Google account. Check the signed-in email in Google's account picker so you don't connect the same account twice.
2. Select the calendars you intend to use. A Google account can contain several calendars; count selected calendars, not email addresses, against your plan's limit.
3. In Syncs, choose a source, a writable destination, and the copy mode. Start with one direction.
4. Choose Busy blocks for destinations that need availability only. Check all-day, declined-event, working-hours, and keyword filters before saving.
5. Preview the rule, create it, and inspect its result in Activity. Add the remaining directions after that pair works.

Connecting an account alone doesn't create event copies. Starter, Pro, and Power allow 2, 5, and 10 calendars respectively; the plan comparison shows current limits and prices.

Test the whole route with a disposable event

Create a short timed event on Client A's calendar inside the sync window. Open Client B's calendar by itself and check its copied busy block. Move the original and check again. Then delete the original and verify that the copy disappears.

Keep editing the original. Editing a managed copy won't update the source, even in a two-way setup. Provider notifications trigger updates, with a safety sweep every 15 minutes; this isn't a guaranteed delivery time.

If a direction produces no copy, use Test this rule to inspect exclusions before trying a repair. If you're replacing another sync service, pause its rules first and use its documented cleanup process. Don't run two services over the same pair during your test.