Stop Losing Calendly Conversion Data

If you’ve embedded Calendly on your website, you’ve probably noticed something frustrating: standard GTM click tracking doesn’t work on it. That’s because Calendly loads inside an iframe, which blocks normal DOM-based tracking entirely.

Calendly’s own support team will tell you to use UTM parameters or their native GA integration (which requires a paid Calendly plan and only connects to one GA4 property). Meanwhile, every DIY tutorial online asks you to write Custom HTML listener scripts, manually create triggers and variables, and hope you didn’t make a typo somewhere.

This template eliminates all of that.

What You Get

A single GTM container file (.json) that imports directly into your Google Tag Manager workspace. After import, your container will include:

• 1 Custom Tag Template — The Calendly Event Tracker, purpose-built to listen for Calendly’s postMessage API and push clean events to the dataLayer
• 1 GA4 Event Tag — Pre-configured to fire on Calendly interactions and send properly formatted event names to Google Analytics 4
• 1 Custom Event Trigger — With regex filtering so only valid Calendly events fire your tags
• 2 Variables — A dataLayer variable for the raw event name, plus a lookup table that maps Calendly events to clean GA4 event names using Voxxy’s OTTRTA methodology

Events Tracked

Who This Is For

➜ Marketing teams running Calendly on lead gen or sales pages
➜ Agencies managing client GTM containers that need a reliable, repeatable Calendly tracking solution
➜ Solo operators who want accurate booking funnel data without hiring a developer