Google Calendar Outlook Sync: Free Options Compared (2026)

Can You Sync Google Calendar and Outlook for Free?

Short answer: kind of. There are free methods but they all have significant trade-offs. Here is an honest breakdown.

Free Option 1: ICS Calendar Subscription

Both Google Calendar and Outlook let you subscribe to external calendars via ICS URL. Export your Google Calendar link, paste it into Outlook (or vice versa).

What works: Events from one calendar appear in the other. Completely free. No third-party tools needed.

What does not work: One-way only. Updates take 12-24 hours. No syncing of changes or deletions. If you edit an event, the edit does not carry over.

Free Option 2: Microsoft Power Automate (Free Tier)

Power Automate has a free tier that lets you create flows between Outlook and Google Calendar. You can set up a trigger: "When a new event is created in Outlook, create a corresponding event in Google Calendar."

What works: More real-time than ICS. Events copy over within minutes.

What does not work: Free tier has limited runs (750/month). Only copies new events. Does not handle updates, deletions, or conflicts. Setting it up requires technical know-how. Breaks occasionally and needs fixing.

Free Option 3: Zapier Free Tier

Similar to Power Automate. Connect Google Calendar and Outlook, set up a zap to copy events.

What works: Easier to set up than Power Automate.

What does not work: Free tier is very limited (100 tasks/month). Same one-way, new-events-only limitations. Not practical for a busy calendar.

Free Option 4: Free Trials of Sync Tools

Most dedicated calendar sync tools offer free trials. CalendarSync gives you 7 days free with no credit card required. During the trial you get real-time sync, two-way sync, and full functionality.

What works: Everything. Real-time updates, two-way sync, handles edits and deletions properly.

What does not work: It is not free forever. After the trial, Pro is 7 dollars per month.

The Real Question

The free methods technically work but they create a worse version of the problem. Events are delayed, changes do not sync, and you still end up checking both calendars "just to be safe."

If avoiding double-bookings matters to you (and it probably does if you are reading this), the 7 dollars per month for a tool that actually works is worth it. One avoided double-booking pays for months of the subscription.

Start a free 7-day trial of CalendarSync and see the difference real-time sync makes.