What Is a Marathon? Distance, History, and FAQ

What Is a Marathon? The Exact Distance Explained

A marathon is a road race that covers exactly 26.2 miles, or 42.195 kilometers.

If you usually think in shorter races, a marathon is a little more than four 10Ks run back to back, with an additional 0.2 mile at the end. That final fraction is one reason the official distance is worth remembering rather than simply rounding it to 26 miles.

The setting may change from one event to the next — flatter roads, steeper climbs, hotter weather, or denser crowds — but the official marathon distance remains the same.

In practical terms, 26.2 miles is a long-distance road race measured to a specific international standard. That consistency is part of what defines the event: a race officially designated and measured as a marathon covers the same distance wherever it is held.

Why 26.2 Miles? The History Behind the Marathon Distance

The story of the marathon begins with the ancient Greek legend of Pheidippides. According to the traditional account, this messenger ran from the battlefield at Marathon to Athens to announce the Greek victory over the Persians.

Modern marathon racing was inspired by this legend, but it did not simply reproduce a precisely measured ancient route.

When the marathon was introduced at the first modern Olympic Games in Athens in 1896, the race distance was 40 kilometers, or about 24.9 miles. In the early years of marathon racing, there was no single standardized distance, and different races could vary considerably in length.

The distance we know today developed later.

At the 1908 London Olympic Games, the marathon course was laid out from the area around Windsor Castle to the finish inside the White City Stadium, in front of the Royal Box. The particular arrangement of the start and finish resulted in a total distance of 26 miles and 385 yards, equivalent to 42.195 kilometers.

However, this distance did not immediately become the universal standard for all marathons. In 1921, the distance of 26 miles 385 yards (42.195 kilometers) was formally standardized as the official marathon distance. The 1924 Paris Olympic Games also used this distance, helping establish it as the standard used around the world.

So why is a marathon 42.195 kilometers, or approximately 26.2 miles?

The answer is not that the ancient Greeks established this distance. Rather, the modern marathon was inspired by an ancient Greek legend, while its precise modern distance originated from the particular course used at the 1908 London Olympics and was formally standardized in 1921.

And technically, 26.2 miles is only an approximation. The exact imperial measurement is 26 miles and 385 yards, which equals approximately 26.21875 miles.

Marathon vs. Other Race Distances

Marathon vs. Half Marathon vs. 10K

For many new runners, 26.2 miles does not mean much until it is placed beside more familiar race distances.

Here is the simple scale:

• 10K = 6.2 miles / 10 kilometers

• Half marathon = 13.1 miles / 21.1 kilometers

• Marathon = 26.2 miles / 42.195 kilometers

A 10K is a shorter road-race distance than a marathon, while a half marathon covers approximately half the distance of a full marathon.

A marathon is not simply two half marathons in sequence. The longer distance means runners spend more time managing pace, fueling, hydration, and fatigue over an extended period. Conditions such as training, weather, course profile, and race strategy can also affect how the distance feels and how a runner performs.

Marathon vs. Ultramarathon

An ultramarathon is a race or running event covering a distance longer than the traditional marathon distance of 42.195 kilometers (26.2 miles).

A race just beyond marathon distance can technically fall into this category. 50K is also a common ultramarathon distance, but it is not a universal minimum distance for every ultra event.

How Long Does a Marathon Take?

There is no single finish time that represents a typical marathon for every runner. Finish times vary widely according to running experience, training, pace, course conditions, weather, and whether a runner uses a continuous-running or run-walk approach.

For a new runner, it is more useful to think of marathon time as a range that depends on individual circumstances rather than as a fixed benchmark.

At the elite level, marathon times are much faster. The current official world records are 2:00:35 for men and 2:09:56 for women, but these performances are far removed from the pace and preparation of most recreational runners.

Walkers and runners using a run-walk strategy may take substantially longer, and some races have cutoff times that can affect how long participants have to complete the course.

Timing adds another layer. In large races, runners often talk about both gun time and chip time. Gun time begins when the race officially starts. Chip time begins when you personally cross the timing mat at the start line. In a crowded city marathon, the difference can be several minutes.

Marathon pace can also change significantly over the course of the race. A pace that feels manageable early on may become more difficult later as fatigue accumulates, making pacing, fueling, and hydration relevant to the overall race experience.

Getting Ready to Run: Training and Gear Basics

Marathon preparation time varies from runner to runner. It can depend on your current running base, previous training experience, goals, and the requirements of the specific event.

Training generally involves building running volume gradually and giving your body time to adapt to longer periods of running. Marathon preparation is also about learning how hydration, fueling, and equipment perform during extended runs.

Longer training runs can provide opportunities to find out what you can comfortably drink and eat while running and whether your shoes, socks, and clothing remain comfortable over a longer period.

Gear matters too because small discomforts can become more noticeable over 26.2 miles. Shoes need to fit well and suit your running needs. Socks can affect friction and comfort. Clothing needs to work with the weather and your own preferences over several hours.

Audio can also be part of a long-distance running setup. Some runners use music or podcasts during training and races. With any headphone design, how much surrounding sound you can hear depends on factors such as volume, fit, and the environment. 

Open-ear headphones leave the ear canal unobstructed, which can help maintain awareness of your surroundings. For example, the Shokz OpenRun Pro 2 combines an open-ear design with an integrated ear-hook and behind-the-neck frame to help keep the headphones stable during longer runs. 

What to Wear and Bring on Race Day

Race day is generally not the time to test completely unfamiliar gear.

Shoes, socks, shorts, tops, and other clothing can be checked during training so you know how they feel over longer periods of running. This can help identify issues such as chafing, bouncing waistbands, or changes in shoe comfort before race day.

What you bring will depend on the event and your own plan. Common items include your bib, safety pins if needed, hydration or fueling supplies, a layer for the start area, and anti-chafe products. Weather can also affect what you need to carry or protect, including your phone and paper items.

Headphone rules are another detail to check before race morning. Race policies vary: some events allow headphones, while others may restrict or prohibit their use in certain circumstances. Check the specific event's official rules before deciding what audio setup to use.

Marathon FAQ

What’s the world record time?

According to World Athletics, the current official marathon world records are:

• Men: 2:00:35 — Kelvin Kiptum (Kenya), Chicago, October 8, 2023

• Women: 2:09:56 — Ruth Chepngetich (Kenya), Chicago, October 13, 2024

These are official world-record performances recognized by World Athletics.

Which are the most famous marathons?

The term World Marathon Majors refers to the Abbott World Marathon Majors series rather than a general ranking of which races are most famous.

As of 2026, the Abbott World Marathon Majors includes:

• Tokyo Marathon

• Boston Marathon

• TCS London Marathon

• TCS Sydney Marathon

• BMW Berlin Marathon

• Bank of America Chicago Marathon

• TCS New York City Marathon

• Sanlam Cape Town Marathon

The series has expanded beyond the original six races. Sydney became the seventh Major in 2025, while Cape Town was confirmed as the eighth Major in 2026 and will hold its first race as a Major in 2027. 

What’s a qualifying time?

A qualifying time is a performance standard that can make a runner eligible to apply for entry to certain marathons.

The Boston Marathon is one example. Its qualifying standards are organized by age group and category, including men's, women's, and non-binary standards. Meeting the applicable standard does not guarantee entry because the Boston Marathon has a limited field and receives more qualifying applications than available places in some years.

For the current standards, qualifying windows, and entry rules, runners should check the Boston Athletic Association directly before planning around a qualifying time.