Definition
CTBUH Definition
The vertical distance from the open-air pedestrian entrance level to the highest architectural element of the building.
The architectural top is the metric used in most global tall-building rankings. It is the height that gets quoted in news headlines, on Wikipedia infoboxes, and in tourism marketing. The Burj Khalifa is "828 metres tall" because of this measurement. The Merdeka 118 is "678.9 metres tall" because of this measurement.
What it includes: the structural crown of the building, decorative spires (whether functional or ornamental), tapered tower elements, and any continuous architectural feature that is part of the design intent.
What it excludes: antennas, flagpoles, broadcast masts (when they are physically separable from the architectural design), and temporary construction equipment. The distinction is sometimes contested - the Empire State Building's spire was once an antenna, then was reclassified as a mooring mast (architectural), then a TV antenna was added on top (not counted).
Why this metric inflates rankings
The architectural top counts every metre of structure to the very tip - including parts that nobody can stand on, ride an elevator to, or use in any practical sense. When two buildings are compared, the one with a taller spire wins, regardless of which one has more usable interior space at altitude.
The Burj Khalifa's top occupied floor is at 585 metres. The remaining 243 metres - from the highest occupied floor to the architectural top - is pure spire. In ranking terms, that 243 metres of decorative steel beats a building like Shanghai Tower, which has occupied floors up to 583 metres but ends shortly after at 632 metres total. The Burj wins by 196 metres on architectural top, but only by 2 metres on actual occupied height.
This is why we publish the Honest Height metric alongside it. The architectural top is a useful structural number; it is not a useful description of how tall a building is for the people who use it.
How architectural top is measured
Measurement is from the lowest open-air pedestrian entrance to the highest architectural element. This means a building on a sloped site may have different perceived heights from different sides. The base is also where comparisons sometimes diverge: some local rankings use the average ground level instead of the lowest entrance.
For seismic and engineering purposes, structural height is also tracked separately. The architectural top is what the public sees in marketing materials and news rankings. The structural top - the height of the highest load-bearing element - is what engineers care about. The two often coincide but not always.