Skip to content
~/reflective_data

analytics-dictionary / term / tracking & measurement

Scroll depth

Scroll depth measures how far down a page visitors scroll, often reported in percentages.

Written by Reflective Data experts · updated Oct 5, 2026

It shows whether content below the fold is seen at all. GA4 records a single scroll event at 90 percent by default; custom tracking can capture 25, 50 and 75 percent thresholds.

Scroll depth tells you about reach, not about reading or attention.

related

Enhanced measurementEventHeatmap

// how we can help

Need tracking you can trust? We implement and audit analytics across GA4, Adobe, Mixpanel and more. Analytics & tracking services → · Audits

more in tracking & measurement

tag-manager.md

Tag manager

A tag manager is a tool for deploying and managing tracking code on a website without…
engagement-rate.md

Engagement rate

Engagement rate is the share of sessions that were engaged, meaning they lasted long enough, included…
key-event.md

Key event

A key event is an event you mark as especially important to your business. In GA4…
conversions-api.md

Conversions API

A conversions API sends conversion events from your server directly to an ad platform, such as…
retention-rate.md

Retention rate

Retention rate is the percentage of users who come back or stay active over a given…
google-signals.md

Google signals

Google signals is a GA4 feature that uses data from signed-in Google users who consented to…

← full analytics dictionary