↔

How to Integrate Google Calendar with Slack

Native vs Make vs n8n vs Relay — setup time, cost & field mapping

Integration Status

Google Calendar (Scheduling) has a native integration with Slack (Communication). This built-in connection handles standard sync scenarios without additional automation tools.

Data Flow Architecture

Google Calendar

→ One-Way

Standard API Latency

Slack

API Tier

REST API v3

Auth Method

OAuth 2.0

Rate Limits

Standard SaaS Limits

Automate Google Calendar + Slack with n8n

Free, open-source workflows you can import into n8n in one click — no subscription required.

Try n8n free — open source, self-hostable → Browse all n8n templates

Ready to automate? We have a template for you.

Copy this Google Calendar → Slack blueprint, open Make.com, paste it into the canvas, and your workflow is ready to configure.

google-calendar-slack-blueprint.json

{
  "name": "Google Calendar → Slack Sync",
  "flow": [
    {
      "id": 1,
      "module": "webhooks:CustomWebhook",
      "version": 1,
      "parameters": {
        "hook": "{{YOUR_WEBHOOK_URL}}"
      },
      "mapper": {},
      "metadata": {
        "designer": {
          "x": 0,
          "y": 0
        },
        "restore": {},
        "expect": [
          {
            "name": "body",
            "type": "text",
            "label": "Body"
          }
        ]
      }
    },
    {
      "id": 2,
      "module": "slack:PostMessage",
      "version": 1,
      "parameters": {},
      "mapper": {},
      "metadata": {
        "designer": {
          "x": 300,
          "y": 0
        }
      }
    }
  ],
  "metadata": {
    "instant": false,
    "version": 1,
    "scenario": {
      "roundtrips": 1,
      "maxErrors": 3,
      "autoCommit": true,
      "sequential": false
    }
  }
}

You'll need to fill in these values:

{{YOUR_WEBHOOK_URL}}

Make.com will prompt you to connect your accounts when you import this blueprint.

Download .json

Open Make.com

Frequently Asked Questions

How do I connect Google Calendar to Slack? ▼

There's no native integration. To connect them, you will need a middleware tool like Make or n8n.

Is the connection between Google Calendar and Slack secure? ▼

Yes. This integration typically uses OAuth 2.0, meaning you grant permission via a secure login window. You do not need to share your raw password, and you can revoke access at any time from your Google Calendar security settings.

Is the sync one-way or two-way? ▼

This is typically a one-way sync: Google Calendar → Slack. Changes in Slack do not sync back to Google Calendar.

Will existing data in Google Calendar sync to Slack? ▼

Usually, no. Most native integrations are "forward-looking," meaning they only sync data created or updated *after* you activate the connection. To move historical data, you will likely need to perform a one-time CSV export/import manually.

Can I sync custom fields? ▼

Native integration is limited to standard fields. For custom field mapping, use an automation tool.

Can I add approval steps before syncing? ▼

Native integrations can't do this. For workflows that need human review (e.g., "Manager must approve before creating invoice"), use Relay.app.

🗂️

Using Google Calendar and Slack with other tools?

Build your full stack map — see all connections and gaps at once.

See your full stack →