How to Build Custom & Calculated Metrics in GA4 for Funnel Rates

Coming soon

This guide will explain how to turn behavioral events into reusable GA4 funnel metrics.

The core pattern:

  • behavioral event
  • numeric event parameter = 1
  • GA4 custom metric
  • calculated metric
  • funnel rate

Example rates:

  • Form start rate = starts / impressions
  • Form completion rate = completions / starts
  • Impression-to-completion rate = completions / impressions

This article will connect implementation guides like HubSpot form tracking to the downstream GA4 metrics and reporting setup.

Implementation Example: HubSpot Forms

For a concrete implementation example, read: track HubSpot form starts and submissions with Google Tag Manager.

That guide shows how HubSpot form behavior can be captured first, before those events are turned into GA4 custom metrics and calculated rates.

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