The length of a marathon is 26.2 miles (42.195 kilometers) because of a historical and royal influence. Originally, marathon races were about 25 miles, inspired by the ancient Greek legend of a messenger running from Marathon to Athens. The specific 26.2 miles distance was established at the 1908 London Olympics when the race was extended so it could start at Windsor Castle and finish in front of the royal box, adding 385 yards to the original 26 miles. This distance was later standardized in 1921 by the International Amateur Athletic Federation (now World Athletics) for all future marathons.

Ancient Greek Origin

The marathon is inspired by the legendary run of the Greek soldier Pheidippides, who ran about 25 miles from Marathon to Athens in 490 B.C. to deliver news of victory.

The 1908 London Olympics Adjustment

For the 1908 Olympics, the course was extended from 26 miles to 26 miles and 385 yards to accommodate the British royal family’s viewing preferences—specifically starting at Windsor Castle and finishing at the royal box in the Olympics stadium.

Official Standardization

This distance (26.2 miles) became the official marathon length in 1921, ensuring consistency and fairness in marathon competitions worldwide.