How big is CN Tower?
CN Tower: 553 m (1,815 ft). Measured as height — structure height.
Source: Wikipedia — CN Tower
Where it sits
Among the 23 buildings & towers on this page CN Tower ranks 7th from the top by size. The largest in the group is Burj Khalifa at 828 m, which is 1.5× the size of CN Tower, while the smallest, Christ the Redeemer, is 30 m.
Stand an adult of 1.7 m beside it and the ratio is 325×: you would need 325 people stacked head to foot to match its size.
In everyday distances
A football pitch is about 105 m long. CN Tower is 5.27× that, which puts it at 5.3 pitch lengths from end to end.
Walking at an easy 1.4 m/s you cover 553 m in 6.6 minutes. A jet at 900 km/h covers it in 2.2 seconds.
Next to its neighbours in size
The nearest thing larger than it in this collection is Lotte World Tower at 555 m (1,819 ft), 1× the size. Both figures are the same kind of measurement, so the gap is a fair one.
The nearest thing smaller is One World Trade Center at 541 m (1,776 ft), so CN Tower is 1.02× as big as it. They sit in the same group.
Against fixed yardsticks
Against three fixed yardsticks — CN Tower is 1.68× the size of Eiffel Tower (330 m); CN Tower is 18.5× the size of blue whale (29.9 m); Earth (12,742 km) is 23,029× the size of CN Tower.
How this figure was taken
Building heights depend on the rule used: architectural height counts spires but not antennas, tip height counts everything. The basis is named with each figure.
How the sizes are taken. Each figure says what it measures — height, length, diameter or elevation — and for which individual or convention. Everything is drawn standing upright on one baseline so a single scale holds, including things that are long rather than tall. Values come from the linked Wikipedia article for each item.
Read the rest — common questions
How big is the CN Tower?
553 m (1,815 ft), measured as height: structure height.
Where does the CN Tower rank among buildings & towers?
Number 7 of 23 on this site, from Burj Khalifa at 828 m down to Christ the Redeemer at 30 m.
What is the next size up?
Lotte World Tower, at 555 m, is 1× the size.
What is the next size down?
One World Trade Center, at 541 m, is 1.02× smaller.
How reliable is the figure?
It is taken from the cited Wikipedia article and states its basis (structure height). Values are rounded, and where individuals differ the figure is a representative one, so expect small differences from other sources.