iCalendar (the .ics format) is the universal calendar standard that Apple Calendar, Outlook, Google Calendar, and most other calendar apps use to share and export event data. When someone talks about syncing iCalendar with Google Calendar, they usually mean one of two things: getting a calendar from Apple Calendar or another source to appear inside Google Calendar, or making events from an .ics file show up alongside your existing Google events.

There are three distinct methods for doing this. Each has different update behavior, different sync direction, and different setup complexity. Which one you need depends on whether you want a one-time import, a live read-only subscription, or a full two-way sync where changes in either calendar reflect in both.

Key Takeaways

• Subscribing via URL gives you a live, auto-updating feed that syncs one-way from the source calendar into Google

• Importing an .ics file is a one-time snapshot with no ongoing sync

• Two-way sync requires a third-party tool since Google and Apple have no native two-way bridge

Method 1: Subscribe to an iCal Feed URL in Google Calendar

This is the cleanest method when you want a live, automatically-updating connection. An iCal feed is a URL that points to a continuously updated .ics file. Google Calendar fetches the URL periodically (typically every 8 to 24 hours) and pulls in any new or changed events.

How to get an iCal URL from Apple Calendar:

1. Open Apple Calendar on Mac

2. Right-click (or Control-click) the calendar you want to share in the left sidebar

3. Select "Share Calendar" (iCloud calendars) or "Copy URL" if it is already a subscribed calendar

4. For iCloud calendars: choose "Public Calendar" to generate a webcal:// URL

5. Copy the URL (it will start with webcal:// or https://)

How to subscribe in Google Calendar:

1. Open Google Calendar on the web (calendar.google.com)

2. Click the plus icon next to "Other calendars" in the left sidebar

3. Select "From URL"

4. Paste the iCal URL (Google handles both webcal:// and https:// formats)

5. Click "Add calendar"

The calendar will appear as a new, color-coded calendar in your Google Calendar. Updates from the source sync automatically, but Google's refresh interval is controlled by their servers, not you. If you need near-real-time updates, this method has a lag of several hours.

Limitations: One-way only. Events you add in Google Calendar will not appear in the source calendar. You cannot delete or edit the source events from Google Calendar.

Method 2: Import an .ics File Into Google Calendar

Use this when you want to bring a set of events in at a specific point in time, with no ongoing sync. Common use cases: migrating events from a previous calendar app, importing a conference schedule, or pulling in a one-time list of events someone shared with you.

How to export from Apple Calendar:

1. Open Apple Calendar on Mac

2. Select the calendar you want to export

3. Go to File → Export → Export

4. Save the .ics file to your computer

How to import into Google Calendar:

1. Open Google Calendar on the web

2. Click the gear icon (Settings) → Settings

3. In the left sidebar, click "Import and export"

4. Click "Select file from your computer" and choose the .ics file

5. Choose which Google Calendar to import the events into

6. Click "Import"

Events import as a static snapshot. They will not update if the source calendar changes. If you need updated events later, you would re-export and re-import. This method works well for small event sets but becomes unwieldy for large or frequently-changing calendars.

Method 3: Use a Two-Way Sync Tool

Neither of the above methods produces true two-way sync. For that, you need a tool that monitors both calendars and keeps them in parity. This is useful if you actively use both Apple Calendar and Google Calendar, want events added in either place to appear in the other, or need to avoid double-booking across the two ecosystems.

CalendarBridge is built specifically for this problem. It syncs between Google Calendar, Apple Calendar (iCloud), Outlook, and other calendar services, with configurable sync direction (one-way or two-way) and the ability to block-off time in the destination calendar without copying event details (useful for privacy). Other options in this category include Fantastical, which can read from multiple calendar sources, and dedicated sync services like SyncGene.

For people managing calendars across both Apple and Google ecosystems, a sync tool removes the manual step of re-subscribing or re-importing when calendars change. See the calendar management tools guide for a broader comparison of tools that handle cross-platform calendar sync.

Why Google Calendar Does Not Sync Automatically With iCalendar

Google Calendar and Apple Calendar are different products from competing companies with no incentive to maintain a native real-time sync bridge. The iCalendar format (.ics) is an open standard they both support for import and export, but the sync infrastructure on top of it is what each company controls separately.

Apple's iCloud Calendar uses the CalDAV protocol for sync within its own ecosystem. Google Calendar uses its own API. Neither natively exposes a real-time push endpoint to the other. The webcal:// subscription method works within these constraints, but the polling interval is slow. For people who need apps to work with Apple Calendar and Google Calendar together, bridging them through a third-party tool or syncing them through an intermediary like Lifestack is currently the most reliable approach.

Using Lifestack Across Both Calendars

If your goal is not just to see events in both places but to actually plan and schedule tasks intelligently across both calendars, Lifestack connects to Google Calendar, Apple Calendar, and Outlook simultaneously. It reads events from all connected calendars to find available windows, then schedules your tasks into those gaps based on your energy data from wearables or manual ratings.

This is useful if you keep work events in Google Calendar and personal events in Apple Calendar, and want your task scheduling to account for both without manually checking for conflicts. Lifestack treats both calendars as inputs and writes scheduled tasks back to whichever calendar you designate as the output. See apps to use with Google Calendar and apps to use with Apple Calendar for more context on tools that work across both platforms.

Pricing: $7/month or $50/year (7-day free trial on annual plan). Available on iOS, Android, and Chrome extension.

Troubleshooting Common Sync Issues

Events not appearing after subscribing via URL: Google refreshes iCal subscriptions on its own schedule, typically every 8 to 24 hours. There is no way to force a manual refresh from the Google Calendar interface. If you need faster updates, the CalendarBridge approach with a shorter sync interval is the alternative.

Webcal:// URL not accepted by Google: Replace "webcal://" with "https://" at the start of the URL. Google Calendar accepts both, but some browsers strip the webcal prefix. The URL structure after the prefix is identical.

Imported events not appearing in the right calendar: During import, Google Calendar asks which calendar to import events into. If you selected the wrong one, there is no direct way to move the events. You would need to delete the imported events and re-import into the correct calendar.

iCal feed showing outdated events: The source calendar controls what the feed contains. If events are not updating, the issue is on the source side, not in Google Calendar. Check that the source calendar is actually publishing its feed publicly and that the URL is still active.

FAQ

Can I sync iCalendar with Google Calendar for free?

Yes. The URL subscription method and the .ics import method are both free and built into Google Calendar. No third-party tools or accounts are needed. The limitation is that these methods are one-way and, for the subscription method, slow to update. For two-way sync, third-party tools like CalendarBridge charge a small monthly fee.

How often does Google Calendar refresh iCal subscriptions?

Google Calendar typically refreshes external iCal subscriptions every 8 to 24 hours. The exact interval is determined by Google's servers and cannot be configured by users. If you need near-real-time sync, a two-way sync tool with a configurable refresh interval is the better option.

What is the difference between subscribing to an iCal feed and importing an .ics file?

Subscribing to an iCal URL creates a live, ongoing connection that updates automatically (with a delay). The subscribed calendar appears in Google Calendar as a separate calendar and reflects changes from the source when Google refreshes the feed. Importing an .ics file is a one-time snapshot with no ongoing sync. After import, those events are static in Google Calendar and will not update even if the original calendar changes.

Why is my iCal feed not updating in Google Calendar?

Google Calendar's refresh interval for subscribed calendars is typically 8 to 24 hours. If your events are older than that and still not updating, check that the source iCal URL is still valid and publicly accessible. Paste the URL into a browser to confirm it returns a valid .ics file. If the URL is valid and the delay is unacceptable, switching to a sync tool like CalendarBridge gives you a shorter, configurable sync interval.

Is there a way to get two-way sync between iCalendar and Google Calendar?

Not natively. The iCalendar format is a publish/subscribe standard, not a two-way protocol. For true two-way sync where changes in either Apple Calendar or Google Calendar reflect in both, you need a third-party sync tool. CalendarBridge is the most purpose-built option. Fantastical also handles read access from multiple calendar sources, though it does not provide true bi-directional write access. For merging multiple Google Calendars, the setup is different and can be done natively within Google Calendar.

Can I subscribe to a Google Calendar in Apple Calendar?

Yes, the reverse direction is also possible. In Google Calendar, find the calendar you want to share, go to its settings, and copy the "Secret address in iCal format." In Apple Calendar, go to File → New Calendar Subscription, paste the URL, and configure the refresh interval. Apple Calendar lets you set the refresh frequency (every 5 minutes to every week), so this direction is more configurable than Google's slow refresh of incoming feeds.