Measuring above-the-fold exposure on your own terms
The fold moves with the device and the browser, so no single number describes it. This page asks for your reference height instead. Enter the viewport height and the height taken by toolbars and tabs, and you get the area that is actually visible. Add the top offset and height of the element you care about and it reports whether that element shows in full, shows partly, or has been pushed below the fold, in pixels and as a share.
Fold height is viewport height minus browser UI height. The visible part of the element is the fold minus the top offset, clamped between zero and the element height, and the scroll needed is the top offset plus the element height minus the fold, clamped at zero. The visible share displays to one decimal and the full, partial and hidden verdicts are decided at that same precision, so the number and the conclusion always agree. Geometry only, as of October 2026.
The page does not hand you a reference height. It does not state a fold in pixels and it does not recommend which elements belong above it, because viewport heights vary with the operating system, the browser version and how the address bar behaves, with no recognized representative value. Audience device mix, scroll depth analytics and collapsing mobile toolbars are out of scope.
Frequently Asked Questions
Read window.innerHeight in the browser console: it already excludes the browser UI. When you use that number, leave the browser UI height at 0.
The page measures exposure and does not recommend placement. The fold differs per device and no recognized standard ranks which elements have to sit above it.
An element entirely below the fold shows 0.0%, and the scroll figure is calculated separately: it is the distance needed to bring the bottom of that element into view.