You might think it’s a random metric measurement, but the story is actually ancient. It all started with a Greek messenger named Pheidippides, who supposedly ran from Marathon to Athens to announce a victory. That original run was about 40 kilometers, give or take a few dusty hills.
But the modern distance of 42.195 km wasn’t set until the 1908 London Olympic Games. The royal family wanted the race to start at Windsor Castle and finish in front of the royal box at the Olympic Stadium. To make that happen, they stretched the course to 26 miles and 385 yards—which converts perfectly to 42.195 km. Talk about a royal decree setting a global standard!
So next time you see that number, remember: it’s a little piece of history, stuck right in the middle of a very long run.
Let’s break it down so it actually feels real.
Imagine walking from your front door to a friend’s house. Now imagine walking that distance seven times. That’s roughly the length of a marathon. To put it in everyday terms, 42.195 km is about the same as driving from central London to the outer edge of the M25 motorway.
You could also think of it as 105 laps around a standard 400-meter running track. Just thinking about that makes my legs a little tired, doesn’t it? For a car, it’s a quick 30-minute cruise; for a runner, it’s a whole morning’s worth of effort, sweat, and quite possibly a few tears of joy.
TCS London Marathon Course Guide - Sports Tours International
Cities like London aren’t small—42.195 km of pavement, cheering crowds, and iconic landmarks is a massive achievement.
Why do we still talk about miles, then?
Even though the official distance is in kilometers, you’ll hear Brits and Americans still say “26.2 miles” with pride. It’s just tradition, like calling a soccer pitch a “pitch.” The London Marathon actually uses mile markers on the course, not kilometer signs, because it feels more familiar to the local crowd.
Here’s a fun fact: 42.195 km equals exactly 26 miles and 385 yards. That extra 385 yards? It’s the distance from the start of the finishing straight to the royal box. If they’d cut that corner, runners would only have to cover about 42.1 km. But who’s counting, right?
We are counting, because every single kilometer matters when you’re out there. The last kilometer—literally the final push—is often the hardest, and it’s a beautiful, brutal 1,000 meters.
London Marathon 2027 ballot: How can I enter next year’s race? | The
How long does it take to cover 42.195 km?
For an elite runner like Eliud Kipchoge, it takes just over two hours. That’s about 21 km per hour—faster than most of us can ride a bike! For a regular person, the average finish time is around 4.5 to 5 hours. That’s roughly the length of three epic movies back-to-back.
If you tried to walk the full 42.195 km, you’d be looking at a solid 8 to 9 hours of walking. That’s basically a full workday, but with better scenery (and way more blisters). So when you see someone wearing a finisher’s medal, remember they just spent the equivalent of a whole morning commute—times ten.
The coolest part? You don’t have to run it.
You can enjoy the London Marathon without even lacing up a shoe. Watch the leaders hit the 42.195 km mark with insane speed, or cheer for the fancy dress runners who are just happy to finish. The distance is a universal challenge, but it’s also a shared experience—whether you’re running, walking, or watching from a pub with a pint.
So next time you hear someone say “I’m running a marathon,” you can casually reply, “Ah, 42.195 kilometers? Nice.” You’ll sound like a pro, and you’ll have the history, the weird math, and the royal connection to back it up. Now, isn’t that a cool little story to share?
