How big is Ben Nevis?
Ben Nevis: 1,345 m (4,413 ft). Measured as elevation — summit elevation above sea level.
Source: Wikipedia — Ben Nevis
Where it sits
Among the 10 mountains on this page Ben Nevis ranks 10th from the top by size. The largest in the group is Mount Everest at 8,848.86 m, which is 6.58× the size of Ben Nevis.
Stand an adult of 1.7 m beside it and the ratio is 791×: you would need 791 people stacked head to foot to match its size.
In everyday distances
A football pitch is about 105 m long. Ben Nevis is 12.8× that, which puts it at 13 pitch lengths from end to end.
Climbing is about vertical metres, not horizontal ones: 1,345 m of elevation is 448 storeys of a typical 3 m floor. Even a lift moving at 10 m/s would need 2.2 minutes to cover it.
Next to its neighbours in size
The nearest thing larger than it in this collection is Mount Kosciuszko at 2,228 m (7,310 ft), 1.66× the size. Both figures are the same kind of measurement, so the gap is a fair one.
The nearest thing smaller is Burj Khalifa at 828 m (2,717 ft), so Ben Nevis is 1.62× as big as it. They come from different groups — buildings & towers against mountains — which is what makes the pairing interesting.
Against fixed yardsticks
Against three fixed yardsticks — Ben Nevis is 4.08× the size of Eiffel Tower (330 m); Ben Nevis is 45× the size of blue whale (29.9 m); Earth (12,742 km) is 9,474× the size of Ben Nevis.
How this figure was taken
Elevation is measured from mean sea level to the summit, not from the base of the mountain. Surveys are revised, so a figure here can differ from an older atlas by a few metres.
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 Ben Nevis?
1,345 m (4,413 ft), measured as elevation: summit elevation above sea level.
Where does Ben Nevis rank among mountains?
Number 10 of 10 on this site, from Mount Everest at 8,848.86 m down to Ben Nevis at 1,345 m.
What is the next size up?
Mount Kosciuszko, at 2,228 m, is 1.66× the size.
What is the next size down?
Burj Khalifa, at 828 m, is 1.62× smaller.
How reliable is the figure?
It is taken from the cited Wikipedia article and states its basis (summit elevation above sea level). Values are rounded, and where individuals differ the figure is a representative one, so expect small differences from other sources.