How Long Is a Marathon? Distance, History, and Splits
A marathon is 26.2 miles (42.195 km). Learn why, the history behind the distance, how long it takes to run, and key split times by goal finish.
May 19, 2026 · 2 min read
A marathon is 26.2 miles, or 42.195 kilometers. That oddly specific number dates to the 1908 London Olympics, where the course was extended so it could finish in front of the royal box, and was later standardized in 1921. Most recreational runners finish a marathon in roughly 4 to 5.5 hours.
Why 26.2 miles?
The marathon commemorates the legend of a Greek messenger running from the town of Marathon to Athens. Early Olympic marathons varied in length until 1908, when the London course measured 26 miles 385 yards (26.2 miles) to accommodate the royal family's viewing. That distance stuck and became official in 1921.
How long does a marathon take?
- Elite men: just over 2 hours; elite women: around 2:10–2:20.
- Strong amateurs: 3:00–3:30.
- Average recreational runners: roughly 4:00–5:00.
- First-timers and walkers: 5:00–6:30+.
Split times by goal finish
Marathon pacing is best thought of in per-mile or per-kilometer splits. A 4-hour marathon requires about 9:09 per mile (5:41 per km). A 4:30 marathon needs about 10:18 per mile. A 5-hour marathon is roughly 11:27 per mile. Holding these splits evenly is the difference between a strong finish and hitting the wall.
The second half is the real race
Many marathoners run the first half too fast and pay dearly after mile 20. Aim to run the second half at the same pace or slightly faster than the first — a so-called negative split.
Marathon vs other distances
- 5K = 3.1 miles
- 10K = 6.2 miles
- Half marathon = 13.1 miles
- Marathon = 26.2 miles
- Ultramarathon = anything longer than 26.2 miles
Frequently asked questions
How long is a marathon in km?
A marathon is 42.195 kilometers, which equals 26.2 miles. The precise figure dates back to the 1908 London Olympic course.
How long does it take to run a marathon?
Most recreational runners finish in 4 to 5.5 hours. Elites run just over 2 hours, strong amateurs around 3–3.5 hours, and first-timers often 5 hours or more.
Why is a marathon 26.2 miles and not a round number?
The 1908 London Olympics extended the course to 26 miles 385 yards so it would start at Windsor Castle and finish in front of the royal box. That distance was standardized in 1921.
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