Updated: January 3, 2026
What Is a Measurement ID?
In Google Analytics 4 (GA4), the Measurement ID is a unique identifier used to distinguish a specific GA4 data stream. Its primary purpose is to tell the tracking code which GA4 property and data stream the data should be sent to.
A GA4 Measurement ID follows the format “G-” + a combination of letters and numbers, for example:
G-XXXXXXX
Further reading: What are the IDs in Google Analytics 4？
How to Find the Measurement ID in GA4
In Google Analytics 4 (GA4), follow these steps:
Click 「Admin」 in the bottom-left corner：
Under 「Data collection and modification」, click 「Data streams」：
Select the Web data stream you want to view：
On the data stream details page, you’ll find the corresponding Measurement ID：
How the Measurement ID Is Used
You can copy and use the Measurement ID for:
- Installing GA4 via Google Tag Manager
- Manual deployment using
gtag.js - Server-side tracking or API-based data collection
Reference
- Google official documentation: https://support.google.com/analytics/answer/12270356
