Scroll Depth

A metric indicating how far down a page a user scrolled. Used to measure content read-through rates and engagement.

Nov 3, 2026 / About 1 min read

Analytics

Scroll depth measures how far down a web page a user scrolled, expressed as a percentage. For example, arrival rates are tracked at the 25%, 50%, 75%, and 100% marks.

Scroll depth matters because page views and time on page alone cannot tell you whether a user actually read the content. A user who opens a page and switches to another tab inflates time-on-page without consuming any content. Scroll depth shows how much of the page was displayed on screen.

In Google Analytics 4 (GA4), when the scrolls option of enhanced measurement is enabled, a scroll event is sent the first time a user reaches 90% vertical depth on each page (per Google's help page as of October 2026). For finer granularity (25%, 50%, 75% thresholds), custom triggers can be set up in Google Tag Manager.

On the destination page of a campaign short URL, scroll depth reveals whether users scroll far enough to see the CTA button. If most users drop off at the 50% mark, options include moving the CTA higher or revising the content around that point.

Combining scroll depth with heatmaps enables even deeper analysis. Scroll depth shows "how far the page was displayed," while heatmaps use color to show where clicks and attention concentrated. Cross-referencing both narrows down candidate areas for improvement.

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Related Terms

Heat Map

An analytics technique that visualizes user behavior on a web page using color intensity. It reveals click positions and scroll depth at a glance.

Event Tracking

A method of measuring user interactions that do not involve page transitions, such as button clicks, video plays, and file downloads.

Bounce Rate

The percentage of users visiting a website who view only the first page and then leave. An indicator of page quality and user experience.

Session

A group of user interactions with a website within a given time frame. A fundamental unit of web analytics measurement.

Page View

A single instance of a web page being loaded or reloaded in a browser, used as a basic measure of website traffic.

Crawl Budget

The upper limit on how many pages a search engine crawler will crawl on a site within a given period. An important concept for SEO on large-scale sites.

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FAQ

What are typical scroll depth numbers?

It varies by industry and content type.

How do I track granular scroll depth in GA4?

GA4's enhanced measurement only tracks the 90% threshold. You can measure 25%, 50%, and 75% by creating scroll depth triggers in Google Tag Manager and sending them as custom events to GA4.

How can I improve low scroll depth?

Make the above-the-fold content compelling (an introduction that makes readers want to continue), create visual rhythm with headings and images, remove unnecessary information to tighten the content, and improve page load speed.

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