Mondo Knows Facts

The marathon is 42.195 km because of a royal view

The odd distance comes from the 1908 London Olympics course

The 1908 Olympic marathon ran from Windsor Castle to the stadium at White City, a distance of 26 miles and 385 yards. The extra yards reportedly let the race start under the royal nursery windows and finish in front of the royal box. The distance was formally adopted as the standard by athletics authorities in 1921.

Dorando Pietri aprรจs son arrivรฉe au marathon des JO de Londres en 1908
Le Miroir des sports ยท Public domain ยท source

Where this comes from

Olympics.com

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Tags: marathon, olympics, history

The marathon is 42.195 km because of a royal view: the short answers

Where does this come from, and can I check it?
The odd distance comes from the 1908 London Olympics course. The figure is taken from Olympics.com, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
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