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Nature

How big is a Moeraki boulder?

The largest recorded Moeraki boulder is about 2.2 m (7 ft 3 in) across.

What is measured: maximum diameter of one boulder

Moeraki Boulder (2.2 m) drawn to scale beside a doorway (2 m) and a 20-foot shipping container (6.06 m)
Drawn to scale, from left to right: Doorway (2 m), Moeraki Boulder (2.2 m) and Shipping container (20 ft) (6.06 m).

Compare

How big is that, really?

  • About the height of a doorway
  • About 1.3× the height of an adult person
  • About 2 would fit end to end along a 20-foot shipping container
  • About 5 would fit end to end along a city bus
  • About 5.8× the height of a bowling pin

Learn

Facts about Moeraki Boulder

Moeraki Boulders are unusually large spherical concretions that grew within seabed mud over millions of years.

Source: Department of Conservation New Zealand — Moeraki Boulders; Te Ara — Moeraki Boulders

Nature

NameSizeCompared with Moeraki Boulder
Okapi1.7 m (5 ft 7 in)0.77×
Red kangaroo1.8 m (5 ft 11 in)0.82×
Welwitschia2 m (6 ft 7 in)0.91×
Moeraki Boulder2.2 m (7 ft 3 in)this page
Harpy eagle2.2 m (7 ft 3 in)same size
Bald eagle2.3 m (7 ft 7 in)1×
Victoria amazonica leaf3 m (9 ft 10 in)1.4×
Giant sunflower3 m (9 ft 10 in)1.4×
Giant Pacific octopus3 m (9 ft 10 in)1.4×
California condor3 m (9 ft 10 in)1.4×

Test your sense of scale

Which is bigger: Moeraki Boulder or Red kangaroo?

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