Scroll depth measures the percentage of a page that visitors actually scroll through. If your page is 5,000 pixels tall and the average visitor scrolls to 2,500 pixels, your average scroll depth is 50%. Most analytics tools track scroll milestones at 25%, 50%, 75%, and 100%.
The typical pattern: a sharp drop-off after the first screenful, gradual decline through the middle, and a small bump at the very bottom (from visitors who fast-scroll to the footer). On average landing pages, only 50-60% of visitors make it past the halfway point. That means your pricing section, your testimonials section, or your FAQ — wherever it sits on the page — might be invisible to half your audience.
Using scroll data to redesign
Scroll depth data should directly inform your content hierarchy. If only 40% of visitors reach your testimonials section, either move testimonials higher or figure out what's causing people to stop scrolling above it. Look for "scroll cliffs" — points where a large percentage of visitors stop. These usually coincide with a section that either bores visitors, confuses them, or satisfies them enough that they stop reading.
To improve scroll depth: use compelling section headers that create curiosity about what comes next, break up text-heavy sections with visuals, avoid repetitive content that signals "you've seen the best stuff," and ensure visual design creates a rhythm that pulls the eye downward. But also question whether the page needs to be that long — sometimes the fix isn't better scroll engagement but a shorter page that puts critical content where more people see it.