Quick Answer
A marathon = 26.2 miles = 42.195km = 105.5 laps of a 400m track = approximately 55,000 steps. Average finish time is around 4:30 for men and 4:45–5:00 for women. Training takes 16–20 weeks minimum.
Marathon Distance in Miles, Kilometres and Track Laps
The official marathon distance is 42.195 kilometres — defined in metric and converted to the commonly used imperial figure of 26.2 miles (technically 26 miles and 385 yards). Here’s how the marathon compares to other common running distances:
| Distance | Kilometres | Miles | Track laps (400m) |
|---|---|---|---|
| 5K | 5 km | 3.1 miles | 12.5 laps |
| 10K | 10 km | 6.2 miles | 25 laps |
| Half marathon | 21.1 km | 13.1 miles | 52.75 laps |
| Marathon | 42.195 km | 26.2 miles | 105.5 laps |
| 50K ultra | 50 km | 31.1 miles | 125 laps |
In practical terms: if you have a regular 10km training route, a marathon is running that four times with a little extra on the end. The two halves are not equal in difficulty — the second 13.1 miles is significantly harder than the first due to glycogen depletion and accumulated muscle fatigue. The notorious “wall” that many marathon runners experience typically strikes around the 30–32km mark (miles 18–20), when stored glycogen runs critically low.
Why Is a Marathon 26.2 Miles?
The exact distance of 26.2 miles was not planned — it was an accident of history that became permanent. Early marathon races varied considerably in length. The first modern Olympic marathon in Athens in 1896 was approximately 40km (about 24.85 miles). The Boston Marathon, first held in 1897, started at 24.5 miles. There was no agreed standard.
The 1908 London Olympics changed this permanently. Organisers set the marathon course to start at Windsor Castle and finish in front of the royal box at the White City Stadium — a distance that worked out to exactly 26 miles and 385 yards (42.195km). The race became famous for the collapse of Italian runner Dorando Pietri, who fell multiple times in the final lap of the track before officials helped him across the line — resulting in his disqualification despite finishing first. The drama of the race and the unusual distance fixed 26 miles 385 yards in the public consciousness.
In 1921, the International Amateur Athletic Federation standardised 42.195km as the official marathon distance. Every sanctioned marathon worldwide has been exactly that distance ever since. The distance is sometimes described as “26.2 miles” even though the precise imperial conversion is 26.2188 miles — the rounding to 26.2 is universal.
Average Marathon Finish Times
How long does a marathon take? It varies enormously depending on fitness, training, and goals:
| Goal time | Pace per mile | Pace per km | Who it suits |
|---|---|---|---|
| 6:00:00 | 13:44/mile | 8:32/km | First-timers; walk/run approach |
| 5:00:00 | 11:27/mile | 7:06/km | Beginner runners; common first-time goal |
| 4:30:00 | 10:19/mile | 6:24/km | Men's approximate average finish time |
| 4:00:00 | 9:09/mile | 5:41/km | Solid recreational performance |
| 3:30:00 | 8:01/mile | 4:58/km | Strong club runner; Boston qualifier territory |
| 3:00:00 | 6:52/mile | 4:16/km | Competitive recreational; top 5–10% of fields |
| 2:30:00 | 5:44/mile | 3:33/km | Semi-elite performance |
| 2:00:35 | 4:35/mile | 2:51/km | Men's world record (Eliud Kipchoge, Berlin 2023) |
| 2:09:56 | 4:58/mile | 3:05/km | Women's world record (Ruth Chepngetich, Chicago 2024) |
The most common first-time goal is finishing — at any time. Sub-5:00 is a popular beginner target. Sub-4:00 requires genuine training over several months. Sub-3:30 is the approximate Boston Marathon qualifying standard for many age groups. Sub-3:00 places you in the top 5–10% of most recreational race fields. Our running pace calculator projects your marathon time from your current 5km or half marathon result.
Marathon Pace Guide
| Goal time | Per km | Per mile | Half split | 30km split |
|---|---|---|---|---|
| 5:00:00 | 7:06/km | 11:27/mile | 2:30:00 | 3:33:00 |
| 4:30:00 | 6:24/km | 10:19/mile | 2:15:00 | 3:12:00 |
| 4:00:00 | 5:41/km | 9:09/mile | 2:00:00 | 2:50:00 |
| 3:30:00 | 4:58/km | 8:01/mile | 1:45:00 | 2:29:00 |
| 3:00:00 | 4:16/km | 6:52/mile | 1:30:00 | 2:08:00 |
The marathon rewards conservative early pacing more than any other common race distance. The majority of recreational runners who miss their goal time do so by running the first half too fast and fading in the final 10km. Our negative split running guide covers the pacing strategy that gives most runners their best marathon results. Our sub-3 hour marathon training plan covers the specific approach for runners targeting that milestone.
How Many Steps Is a Marathon?
The average runner takes approximately 55,000 steps to complete a marathon, based on a typical running stride length of 75–80cm. At 1,250–1,333 steps per kilometre, over 42.195km this comes to roughly 52,700–56,260 steps. Taller runners with longer strides take fewer steps; shorter runners or those with high cadence styles take more.
A quick personal estimate: count your steps over a measured kilometre on your next run, then multiply by 42. Most GPS watches and fitness trackers record step count automatically during races and training runs.
How Long to Train for a Marathon
Can run 10km comfortably: 16–20 weeks. The standard starting point for most marathon training plans. Training builds the long run progressively from 16km to 29–32km over the block, with a 2–3 week taper before race day.
Has completed a half marathon: 14–16 weeks. The cardiovascular base is established — training focuses on extending long run distance and building weekly volume.
Complete beginner: 6–12 months. Build a continuous running habit and reach comfortable 10km before starting a marathon-specific plan. Attempting a marathon without a running base is the most common cause of DNS and injury among first-timers.
The longest training run is typically 29–32km (18–20 miles), done 2–3 weeks before race day — intentionally shorter than the race distance. The taper period allows the body to recover and maximise glycogen storage before the start. Our marathon training plans are structured for every level from first-timer through to sub-3:00 targets.
Ready to Train for Your Marathon?
SportCoaching's marathon training plans are built for every level — from first-timers to runners chasing a personal best. Every session has paced targets so you always know exactly what effort you're training at and why.
FAQ: Marathon Distance
How many miles is a marathon?
26.2 miles (42.195km). On a 400m track, that’s 105.5 laps. The official distance has been standardised since 1921.
Why is a marathon 26.2 miles?
The 1908 London Olympics — the course ran from Windsor Castle to the royal box at the Olympic Stadium, measuring exactly 26 miles and 385 yards. The IAAF made this the official distance in 1921. Every sanctioned marathon has been 26.2 miles ever since.
How many km is a marathon?
42.195km — sometimes rounded to 42.2km. Exactly double the half marathon distance of 21.0975km.
How many steps is a marathon?
Approximately 55,000 steps for the average runner. Range: 48,000–62,000 depending on height and running cadence. Estimate yours: steps-per-km × 42.
How long does it take to train for a marathon?
16–20 weeks if you can run 10km. 14–16 weeks with a half marathon base. 6–12 months for complete beginners (build a running base first). Longest training run: 29–32km, done 2–3 weeks before race day.
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