Scroll Depth
01 Definition
Scroll Depth meaning: Scroll depth measures how far down a page visitors scroll, often as a percentage.
Scroll depth tracks how much of a page a visitor reaches, commonly at milestones like 25, 50, 75, and 100 percent. It is usually captured as events. In Google Analytics 4, an automatic scroll event fires when a user reaches roughly 90 percent of the page.
Why it matters
How Scroll Depth fits the work
Scroll depth shows whether people actually reach key content lower on a page, helping you judge layout, length, and where to place important messages.
In context
On a long article, 70 percent of visitors reached the 50 percent mark but only 30 percent scrolled to the bottom of the page.
Practical note
Scroll events measure reaching a point, not reading it, so a 100 percent scroll can still mean the visitor skimmed or scrolled past without engaging.