How to sync Outlook to Google Calendar (two-way, in real time)
Updated 2 June 2026 · LeapSync team
Why Outlook doesn't sync to Google on its own
Microsoft and Google are competing ecosystems, so neither builds real sync into the other. If you live in Outlook for work but run your personal life in Google Calendar (or vice-versa), here's what Microsoft actually gives you:
- Publish a calendar (ICS link) — Outlook on the web can publish your calendar as a secret .ics URL you add to Google. It's free, but one-way and slow: Google polls subscribed calendars on its own schedule, often every several hours up to a day or two, and your edits in Google never reach Outlook.
- Forward individual invites — you can forward a single meeting to your Gmail and accept it. That's per-event manual work, not sync, and it breaks on reschedules.
- Automation tools (Power Automate, Zapier) — can copy events, but they poll on an interval (typically 1–15 minutes), stumble on recurring events, and get expensive once you run them in both directions.
The options compared
| Method | Direction | Speed | Cost |
|---|---|---|---|
| Outlook "publish" → Google subscribe | One-way (Outlook→Google) | 12–48 hours | Free |
| Forward invites manually | One-time, per event | Manual | Free |
| Power Automate / Zapier | One- or two-way | 1–15 min (polling) | Per-task fees |
| Dedicated sync tool (LeapSync) | Two-way | Under ~5 seconds | From $4/mo |
How to sync Outlook to Google in 2 minutes
- Create a free LeapSync account at app.leapsync.app/signup — magic-link or "Sign in with Microsoft / Google", no password.
- Connect your Microsoft 365 / Outlook.com account. You authorise on Microsoft's own screen; LeapSync requests only calendar read/write — never email, contacts, or files.
- Connect your Google Calendar the same way.
- Choose the direction — two-way, or one-way Outlook→Google if you only want work events mirrored into your personal Google calendar. LeapSync matches events between them and keeps them in step.
From then on, a meeting you accept or change in Outlook shows up in Google Calendar — typically in under five seconds, thanks to push notifications from Microsoft and Google (plus an hourly safety sweep so nothing is missed). Want it on your iPhone too? LeapSync also publishes a private, read-only Apple/ICS feed you subscribe to by scanning a QR code — no Apple ID password needed.
One-way or two-way: which do you want?
A common setup is one-way Outlook → Google: your work calendar appears inside your personal Google Calendar so you can see conflicts at a glance, but personal events stay out of your work account. If you actively manage both calendars, two-way keeps either side editable. LeapSync supports both per calendar pair, and you can change it later.
How to avoid duplicate events
Duplicates are the classic failure of DIY sync — point two one-way automations at each other and every event echoes back and forth forever. A purpose-built tool fixes this by tracking which mirrored event corresponds to which original, so an edit updates the existing copy instead of creating a new one. If you've already made a mess with Power Automate or manual imports, clear the duplicated copies once, then let a single two-way sync own the relationship.
Is syncing Outlook to Google safe and private?
It depends on the provider, so check before you connect. LeapSync stores only what it needs to match events (IDs and timestamps) and does not keep your event titles, descriptions, or attendee lists in its database; access tokens are encrypted at rest with AES-256-GCM. You can disconnect at any time, and token data is deleted within 30 days.
Syncing the other direction instead? See how to sync Google Calendar with Outlook, or compare the best calendar sync tools.
Frequently asked questions
- Can I sync Outlook to Google Calendar for free?
- Partially. Outlook can publish a read-only ICS link you subscribe to in Google, but it's one-way and Google refreshes it slowly — often 12–48 hours. True real-time, two-way sync needs a dedicated service; LeapSync starts at $4/month with a free 14-day trial.
- Why don't my Outlook events show up in Google Calendar instantly?
- Because Google polls subscribed ICS calendars on its own schedule rather than fetching changes live. There's no setting to speed it up. A webhook-based sync tool like LeapSync pushes changes through in under ~5 seconds instead.
- Can I sync only one way, Outlook to Google?
- Yes. LeapSync lets you pick one-way Outlook→Google (so work events appear in your personal Google calendar without sending personal events back) or full two-way sync, per calendar pair.
- Will syncing create duplicate events in Google Calendar?
- Not with a purpose-built tool. LeapSync tracks which mirror corresponds to which original, so edits update the existing copy rather than creating new ones. Naive two-way automations are what cause duplicate loops.
- Does this work with a work Microsoft 365 account?
- Yes, if your organisation allows third-party calendar apps via Microsoft Graph. LeapSync requests only calendar read/write permission, never email or files, and an admin can review the scopes during sign-in.