For 28 years, the Olympics could not settle on how far a marathon was. Athens in 1896 measured roughly 40 kilometers. Paris in 1900 came in at 40.26. London in 1908 ran 42.195, for reasons nobody had planned in advance. Then in 1924 that London number got frozen, forever, as the official distance: 42.195 kilometers, or 26 miles and 385 yards. It is the only one of those distances that is not a round number in either kilometers or miles.
The popular version you have probably heard involves a Greek soldier named Pheidippides, a battlefield near a town called Marathon, and a dying man gasping out news of victory before he drops dead. It is a great story. It is also, on the evidence, mostly invented six centuries after the fact, and it has almost nothing to do with why the modern race is 26.2 miles rather than 25 or 24.
The legend everyone learned wrong
The earliest account of a famous Marathon-related run comes from Herodotus, writing decades after the battle in 490 BC. His runner, whom the manuscripts call Philippides (later editions print the more familiar Pheidippides), was a hemerodromos, a professional long-distance messenger employed specifically to move fast over land. Herodotus sends him from Athens to Sparta, about 240 kilometers each way, to beg for military help before the battle. He arrives the next day. He does not run from Marathon to Athens. He does not die. Herodotus, the source closest in time to the actual event, never mentions any of that.
The death comes from Plutarch, writing more than 500 years later, and even he will not settle on a name: he cites the historian Heraclides Ponticus for "Thersippus of Erchius" but says most writers preferred a runner called Eucles, who staggered in from the battlefield in armor, said "Hail, we are victorious," and died on the spot. Lucian of Samosata, around 600 years after the battle, finally fused the two stories into the version everyone now knows: a runner named Philippides, running from Marathon itself, dying after delivering the news. Robert Browning's 1879 poem popularized that composite, and it is the version the men who founded the modern Olympics grew up on.
None of that history determined a race distance. What did was more prosaic. A French philologist named Michel Bréal, a friend of Olympic founder Pierre de Coubertin, proposed a long-distance run from Marathon to Athens for the 1896 Games and offered to donate a silver trophy for the winner. The organizers planned a course tracing that legendary road, and it worked out to roughly 40 kilometers, about 24.85 miles. That was the length of the road they measured.
Seven Games, six distances, one outlier
Here is what happened to the number, Olympics by Olympics, according to the Olympic Museum's archive and the surviving records of each Games:
- 1896, Athens: about 40 km. The road from the town of Marathon to the Panathenaic Stadium, taken more or less as it was.
- 1900, Paris: 40.26 km. Four laps of a track followed by a street loop through the city. The distance was whatever that loop happened to add up to.
- 1904, St. Louis: about 40 km. Five laps of a stadium track plus dusty country roads outside it.
- 1908, London: 42.195 km. The odd one out, and the one that stuck. More on this below.
- 1912, Stockholm: 40.2 km. The first out-and-back Olympic marathon, and organizers deliberately reverted to the roughly 40 km norm, ignoring what London had just done.
- 1920, Antwerp: 42.75 km, the longest Olympic marathon officially recorded, though the Association of Road Racing Statisticians believes the actual course measured closer to 40.
- 1924, Paris: 42.195 km. London's number, run again, this time on purpose. It has not moved since.
One running-history archive sums up the first seven Games this way: six different distances across those seven Olympics, with the round 40-kilometer figure used twice and nothing else repeating. The 1908 figure is the only one of the seven that is not a tidy round number in either kilometers or miles.
How London got to 26 miles 385 yards
The most detailed reconstruction of what happened in 1908 comes from Bob Wilcock, a historian with the International Society of Olympic Historians, whose 1908 marathon paper for the Journal of Olympic History works back through the contemporary press, the official race programme, the Amateur Athletic Association's own archive, and a written inquiry to the Royal Archives at Windsor. His own framing of the problem is blunt: "The Official Report does not give any explanation as to how this seemingly arbitrary distance was determined, and various explanations have been put forward... Some owe more to a writer's imagination than reality, some are contradictory, all are incomplete."
What his research documents is a chain of small, local decisions, each one reasonable on its own, that added up to something nobody had designed on purpose.
The British Olympic Council's original plan called for a marathon of 25 miles, agreed with the International Olympic Committee and handed to the Amateur Athletic Association to route. A club called the Polytechnic Harriers, specifically their honorary secretary Jack Andrew, laid it out. His first version, from a statue of Queen Victoria in Windsor, measured about 25.5 miles. Organizers then moved the start to the Castle's East Terrace for privacy and security, with only the officials directly connected to the start allowed to be present, and that move added 700 yards. A separate problem, tram lines and cobblestones on the final couple of miles, forced a detour across an area called Wormwood Scrubs, adding roughly 1,000 more yards. By early 1908 the course measured 26 miles to the edge of the White City track, plus a full extra lap to the finish line.
Then one more thing changed, and it is the detail that produced the strange number. The entrance the marathon route was supposed to use, directly under the Royal Box, got taken over for carriage access during the opening ceremony and was no longer available. The marathon's entrance to the stadium moved to the opposite side of the track. Because the new entrance sat diagonally across from the Royal Box rather than in front of it, the direction of the race inside the stadium was reversed to clockwise, so that runners would pass in front of both stands and arrive at the finish line that already sat before the Royal Box. That reversal left a partial lap of exactly 385 yards between the new entrance and the finish line. Twenty-six miles to the edge of the track, plus 385 yards around it: 42,195 meters, give or take about a centimeter of rounding. Nobody set out to create that figure. It is what was left over after a sequence of unrelated, sensible fixes.
More than a century later, London still hosts one of the World Marathon Majors every spring, though today's London Marathon runs an entirely different route through the city center and shares nothing with the road from Windsor to Shepherd's Bush.
Where the accounts disagree
The story most runners know, that the distance got stretched so the royal family could watch from a window, is repeated by sources with real authority. World Athletics itself has stated that the classic distance was set "to allow the Royal family to watch the start of the race from the window of the nursery in Windsor Castle." The Olympic Museum describes organizers insisting the finish land "right in front of the Royal Box." This is the version told by the institutions that govern the sport.
Wilcock's own archival research finds no support for it. On the start: the Princess of Wales did take advantage of the Terrace start once it existed, but the 700 yards were added for security before she was involved, and a letter from the Registrar of the Royal Archives at Windsor turned up nothing in the palace's own records to back the popular account. On the finish: every race at White City that year finished in front of the Royal Box, because that is where the stadium's finish line already was. The distance changed because an entrance moved and a direction of travel flipped, not because anyone rearranged the race for Queen Alexandra's benefit. Wilcock's summary of the mechanism is close to definitive: "There was no royal influence on the determination of the distance." Two smaller myths fall the same way. Arthur Conan Doyle did not catch the collapsing Italian runner Dorando Pietri at the finish line; he was seated in the stands as a newspaper correspondent, and it was Jack Andrew, the same official who had laid out the course, at Dorando's elbow. Queen Alexandra did not signal the start by telegraph either; she was still riding to the stadium when the gun went off.
Wilcock is careful to hedge his own most interesting theory. Dorando entered the stadium first, turned the wrong way onto the reversed track, and collapsed repeatedly before being helped across the line, which got him disqualified. Wilcock's own words on whether the last-minute reversal caused that wrong turn: "Probably not, but Dorando was clearly running by instinct and pure determination at the end, and instinct would have told him to turn right, as he tried to do." It is a good detail, it is speculation, and Wilcock says so himself. The one piece of the royal story that does check out is almost an afterthought: Queen Alexandra really did hand Dorando a silver-gilt trophy the next day, as a consolation prize for the disqualification. She just had nothing to do with the number.
The honest way to describe all of this is not that historians in general have debunked the royal legend. One historian, working from the 1908 newspapers, the stadium programme, and a written reply from the Royal Archives, found no evidence for it, and no second archival investigation, agreeing or disagreeing, appears to have been published since. A 2025 Boston.com piece lays the two accounts side by side for exactly this reason. That is still a strong claim, though a narrower one than the popular telling suggests.
The number that outlived its own reason
The 1908 distance did not become the standard right away. Stockholm in 1912 reverted to about 40 kilometers and ignored what London had done. It took until 1921, at the international governing body's congress, for 42.195 kilometers to be formally adopted as the standard, taking effect at the 1924 Paris Games and holding ever since. Two explanations get offered for how the number survived the years in between. A yearly race called the Polytechnic Marathon ran the exact 1908 distance and route starting in 1909, and its prestige is credited with keeping that figure in circulation until the federation made it official. The other is simpler: 1908 had been an unusually dramatic Games, with a disqualified leader and a story the press loved, and that made its number harder to abandon than a quieter Games' would have been.
What is striking is what happened when officials sat down to make the number permanent. Three separate sources, among them the Olympic Museum's own archive and the international association of marathon organizers, agree on the same thing: no explanation was ever recorded for why this particular figure, rather than a round 40 or 42 kilometers, became the permanent standard. The federation's minutes are reported to be silent on it. The number that every marathon runner on earth now trains around, tapers for, and measures a personal best against is one that nobody, at the moment it became official, bothered to justify in writing.
Boston kept moving too
The Olympics were not the only race rearranging its own distance to fit circumstances on the ground. The Boston Marathon, which the Boston Athletic Association's own history records as running since 1897, started at Metcalf's Mill in Ashland and covered 24.5 miles, nearly 2.8 kilometers short of today's standard, and it ran that course for 27 consecutive years. In 1924, the same year the Olympic figure went permanent, Boston moved its start line roughly two miles west to Hopkinton specifically to conform to the new Olympic standard of 26 miles 385 yards. That year's race doubled as the American Olympic trial for the Paris Games.
Boston's course did not stay put after that either. Road straightening and other alterations quietly shortened the route again, and by the mid-1950s it measured roughly 1,183 yards short of standard, about two-thirds of a mile. Fast times run in those years, including performances by Keizo Yamada and Antti Viskari, are widely reported never to have been recognized as world bests because of the shortfall. Officials remeasured and corrected the course in 1957, and John J. Kelley won the first race on the fixed distance. Boston has held 26.2 miles ever since.
The legend's own road runs a different number now
There is a strange coda to all of this. The actual road from the town of Marathon to Athens, the one the legend describes and the one the 1896 organizers ran, measures about 40 kilometers, roughly what those first Olympic organizers used. The modern Athens Authentic Marathon, run over largely the same historic ground every year, covers the full 42.195 kilometers instead, because since 1921 every certified marathon has had to. The modern distance, set by a sequence of stadium logistics in west London in 1908, was applied backward onto the road the legend describes.
The distance every marathoner now trains for came out of a security decision at a castle, a road detour around cobblestones, and a stadium entrance repurposed for royal carriages, all inside a few months in 1908. The figure held on for thirteen years without anyone recording why, then was adopted permanently, still with no explanation on the books. Every marathon run since, from Boston to Athens itself, has had to measure up to a number nobody designed.
