Google Calendar doesn’t have a built-in feature to automatically copy events from one calendar to another. But there are four reliable ways to do it with external tools — the fastest is a free, no-code mirror you set up once.

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Why You’d Want This

The most common use case: you have a work Google Calendar and a personal Google Calendar (or two separate Google accounts), and you want events from one to automatically appear on the other — without manually duplicating them.

Other scenarios:

• Showing a “busy” block on a shared team calendar whenever you add an event to your private calendar
• Mirroring a calendar for backup
• Keeping a project calendar in sync with your main calendar

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Method 1: Calendar Sync (Free, No Code, Rule-Based)

Calendar Sync automatically copies events from one calendar to another with a rule layer you set once, and keeps the destination current as events are added, edited, and deleted. Per event you can keep the title or rewrite it (“Busy,” or a template like [Personal] {title}), strip attendees, blank the description or location, and set the copy as Busy/Free/Tentative — applied conditionally (by visibility, attendee count, day, duration, organizer, and more). It’s a one-way mirror, so the source is never changed.

Setup: Pick a source calendar and a destination, choose what carries over, and turn it on. Updates and deletions propagate automatically.

Tradeoffs:

• Free, no signup required to try it
• No code and no per-Zap juggling for updates or deletions
• One-way mirror by design (not two-way sync)

Best for: Auto-copying events between calendars with full control over what carries over — without paying for a sync subscription.

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Method 2: Zapier (No Code, Per-Event Zaps)

Zapier connects Google Calendar accounts and copies events automatically.

Setup:

1. Create a free Zapier account
2. Create a new Zap: trigger = “New Event in Google Calendar” (source calendar)
3. Action = “Create Detailed Event in Google Calendar” (destination calendar)
4. Map the fields: title, start time, end time, description, location
5. Turn on the Zap

Result: Every new event added to the source calendar gets copied to the destination within minutes.

Tradeoffs:

• Free plan has limited Zap runs (100/month) — enough for light use
• Updates and deletions don’t sync automatically (you need separate Zaps for each)
• Paid Zapier plan needed for full sync behavior

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Method 3: Google Apps Script (Free, More Control)

Google Apps Script is Google’s built-in automation tool — free with any Google account, no extra service needed.

Setup:

1. Go to script.google.com and create a new project
2. Paste this script:

function copyEvents() {
  var sourceCalId = 'your-source-calendar@gmail.com';
  var destCalId = 'your-destination-calendar@group.calendar.google.com';

  var now = new Date();
  var future = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000); // 7 days ahead

  var sourceCal = CalendarApp.getCalendarById(sourceCalId);
  var destCal = CalendarApp.getCalendarById(destCalId);
  var events = sourceCal.getEvents(now, future);

  for (var i = 0; i < events.length; i++) {
    var event = events[i];
    // Check if already copied (using description tag)
    if (event.getDescription().indexOf('[COPIED]') === -1) {
      destCal.createEvent(
        event.getTitle(),
        event.getStartTime(),
        event.getEndTime(),
        {description: event.getDescription() + '\n[COPIED]', location: event.getLocation()}
      );
      event.setDescription(event.getDescription() + '\n[SYNCED]');
    }
  }
}

3. Replace the calendar IDs with yours (find them in Google Calendar settings → Integrate calendar)
4. Save the script
5. Set up a trigger: clock icon → Add trigger → copyEvents → every hour (or every 15 minutes)

Result: The script runs on your chosen schedule and copies any new events from source to destination.

Tradeoffs:

• Free, no third-party service needed
• Requires basic comfort with code (copy-paste level)
• Doesn’t handle updates or deletions without additional logic
• Can create duplicates if not carefully managed

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Method 4: CalendarBridge (Paid, Two-Way)

CalendarBridge is a dedicated tool for syncing calendars across accounts, including two-way sync and deletion propagation.

What it does:

• Copies events from one Google Calendar account to another
• Shows “Busy” blocks on the destination calendar (to protect privacy while showing availability)
• Syncs updates and deletions
• Works across Google ↔ Google, Google ↔ Outlook, and Outlook ↔ Outlook

Setup: Connect your accounts, choose which calendars to sync, configure what details to show (full event details or just “Busy”).

Tradeoffs:

• Paid service (free trial, then ~$4–8/month)
• Most reliable option if you specifically need true two-way sync

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Which Method to Use

Need	Best method
Auto-copy events, free, no code	Calendar Sync
Control what carries over (title, attendees, “Busy”)	Calendar Sync
Show “busy” without sharing details, free	Calendar Sync
Simple one-way copy without rules	Zapier (free tier) or Apps Script
No third-party services at all	Apps Script
True two-way sync with deletions both directions	CalendarBridge (paid)

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What Google Calendar Doesn’t Do Natively

Google Calendar has no built-in “copy events to another calendar automatically” feature. You can manually move an event to a different calendar (edit event → change the calendar dropdown), but that removes it from the original. Copying requires one of the methods above.

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Related: How to manage multiple Google Calendars · How to sync Google Calendar with Outlook · How to get your Google Calendar ICS URL

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