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The official distance of a full marathon is 42.2 kilometers, or more precisely 42.195 kilometers. This standard was set by the International Association of Athletics Federations (World Athletics) in 1921.

The distance is based on the 1908 London Olympic Games marathon, which was extended so the race could start at Windsor Castle and finish in front of the royal box at the Olympic Stadium. This exact length later became the official marathon distance worldwide.

Quick facts about the full marathon:

• Exact distance: 42.195 km (commonly called 42.2 km)


• Originated from ancient Greece, inspired by the legend of Pheidippides


• Standardized in 1921 by World Athletics


• Major event in the Summer Olympics and international city marathons


• Requires months of endurance training

Knowing official race distances is useful for sports general knowledge, competitive exams, and athletics-related job tests.