How big is Tokyo Skytree?
Tokyo Skytree: 634 m (2,080 ft). Measured as height — tower height.
Source: Wikipedia — Tokyo Skytree
Where it sits
Among the 23 buildings & towers on this page Tokyo Skytree ranks 2nd from the top by size. The largest in the group is Burj Khalifa at 828 m, which is 1.31× the size of Tokyo Skytree, while the smallest, Christ the Redeemer, is 30 m.
Stand an adult of 1.7 m beside it and the ratio is 373×: you would need 372 people stacked head to foot to match its size.
In everyday distances
A football pitch is about 105 m long. Tokyo Skytree is 6.04× that, which puts it at 6 pitch lengths from end to end.
Walking at an easy 1.4 m/s you cover 634 m in 7.5 minutes. A jet at 900 km/h covers it in 2.5 seconds.
Next to its neighbours in size
The nearest thing larger than it in this collection is Burj Khalifa at 828 m (2,717 ft), 1.31× the size. Both figures are the same kind of measurement, so the gap is a fair one.
The nearest thing smaller is Shanghai Tower at 632 m (2,073 ft), so Tokyo Skytree is 1× as big as it. They sit in the same group.
Against fixed yardsticks
Against three fixed yardsticks — Tokyo Skytree is 1.92× the size of Eiffel Tower (330 m); Tokyo Skytree is 21.2× the size of blue whale (29.9 m); Earth (12,742 km) is 20,098× the size of Tokyo Skytree.
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 Tokyo Skytree?
634 m (2,080 ft), measured as height: tower height.
Where does the Tokyo Skytree rank among buildings & towers?
Number 2 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?
Burj Khalifa, at 828 m, is 1.31× the size.
What is the next size down?
Shanghai Tower, at 632 m, is 1× smaller.
How reliable is the figure?
It is taken from the cited Wikipedia article and states its basis (tower height). Values are rounded, and where individuals differ the figure is a representative one, so expect small differences from other sources.