How long is a marathon, in kilometres?

Sports easy Data from 1921

Guess before you scroll — the answer is below

Answer in kilometres. Shorthand like 9m or 1.2bn works.

The answer

42 kilometres

Roughly 42.2.

A marathon is exactly 42.195 km. The oddly precise distance comes from the 1908 London Olympics, where the course was extended so it could finish in front of the royal box. It was fixed as the official distance in 1921 and has not moved since.

Where this number comes from

Source World Athletics competition rules
Figure refers to 1921
Last checked
Unit kilometres

Numbers move. If this one has drifted from its source, let us know.

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