A marathon covers 26.2 miles, or exactly 42.195 kilometers. This standard applies to officially measured marathon courses worldwide, from the streets of Boston and New York City to smaller regional races.
The unusual distance has its roots in the early Olympic Games. It wasn’t established by modern training requirements or an ancient Greek measurement. Instead, a particular race route in London helped determine the length that runners still cover today.
For anyone preparing to run a marathon, the distance is only part of the challenge. Pacing, endurance, nutrition, and course conditions can all influence how those 26.2 miles unfold.
What Is the Official Marathon Distance?
The official marathon distance is 42.195 kilometers, equivalent to 26 miles and 385 yards. Expressed as a decimal, that is approximately 26.2188 miles, conventionally rounded to 26.2.
World Athletics recognizes this distance for standard marathon competitions. Certified courses must follow established measurement procedures to ensure they meet the required length.
| Unit | Marathon Distance |
| Kilometers | 42.195 km |
| Meters | 42,195 m |
| Miles | Approximately 26.2188 miles |
| Miles and yards | 26 miles, 385 yards |
| Feet | Approximately 138,435 feet |
Marathon courses can include hills, bridges, sharp turns, and varying road surfaces. These features affect pacing and finishing times, even though the official distance remains unchanged.
How Marathon Courses Are Measured
Marathon courses are typically measured using a calibrated bicycle fitted with a Jones Counter. The device records wheel revolutions, allowing trained measurers to calculate distance after calibrating the bicycle on a known section of road.
Measurements follow the shortest possible route (SPR) that a runner can legally take within the course boundaries. Course measurers also apply a short course prevention factor of 0.1% to reduce the risk of an undersized course. This factor is part of the measurement procedure, not an additional distance that runners must complete beyond the official marathon length.
A runner’s GPS watch may therefore show more than 26.2 miles at the finish. Wide turns, overtaking other participants, and moving away from the shortest measured line add distance. GPS errors can also affect readings, particularly near tall buildings or underpasses.
A recorded distance of 26.4 miles does not necessarily mean the course was measured incorrectly.
Why Is a Marathon 26.2 Miles Long?
The modern marathon distance emerged from ancient Greek history and the practical decisions of early Olympic organizers.
The Legend Behind the Marathon
The event takes its name from Marathon, a Greek town associated with the Battle of Marathon in 490 BCE.
A familiar legend describes a messenger running from Marathon to Athens to announce the Greek victory over Persian forces before collapsing and dying. The messenger is commonly identified as Pheidippides, although ancient accounts differ considerably. The story is better understood as a tradition surrounding the event than as a verified historical record.
The journey between Marathon and Athens inspired the modern race, but it did not establish its exact distance.
The First Olympic Marathons
The marathon made its Olympic debut at the 1896 Athens Games. Greek runner Spyridon Louis won the men’s race on a course measuring approximately 40 kilometers.
Early Olympic organizers had no universally accepted marathon distance. Routes depended on local geography, available roads, and the location of the finish.
The 1900 Paris and 1904 St. Louis Olympic marathons also covered distances different from today’s standard.
How the 1908 London Olympics Changed the Distance
The distance used today originated at the 1908 London Olympics.
The course began on the grounds of Windsor Castle and ended in front of the royal box at London’s White City Stadium. The route and the placement of the finish line resulted in a distance of 26 miles and 385 yards.
The London route became influential, although other marathon distances remained in use for several years.
In 1921, the International Amateur Athletic Federation, the predecessor of World Athletics, adopted 42.195 kilometers as the standard marathon distance. The new standard was subsequently used for international competition.
Today’s 26.2-mile marathon is therefore a rounded expression of the distance associated with the 1908 Olympic course.
Marathon Distance in Miles and Kilometers
Marathon distances are generally expressed in miles in the United States and kilometers in countries using the metric system.
For runners following kilometer markers, the finish comes 195 meters after the 42-kilometer point. On a course marked in miles, the remaining distance after mile 26 is approximately 385 yards.
Marathon Distance Landmarks
Distance markers help runners monitor their progress and compare their actual pace with their race plan.
| Distance Covered | Miles | Kilometers |
| 5K | 3.11 | 5 |
| 10K | 6.21 | 10 |
| 15K | 9.32 | 15 |
| Half marathon | 13.11 | 21.0975 |
| 30K | 18.64 | 30 |
| 40K | 24.85 | 40 |
| Full marathon | 26.22 | 42.195 |
The halfway mark provides an opportunity to assess pacing before fatigue becomes more pronounced. Runners who reach it substantially ahead of schedule may find maintaining their speed difficult later.
By kilometer 30, roughly 18.6 miles into the race, pacing and fueling become increasingly important. The final 10 kilometers can be particularly demanding for runners who started too quickly.
How Many Steps Are in a Marathon?
The number of steps required to finish a marathon depends on average step length, running speed, and individual mechanics.
At an average step length of 1.0 meter, a runner would take approximately 42,195 steps. Increasing that average to 1.2 meters reduces the estimated total to 35,163 steps.
These are mathematical examples rather than typical step counts for every runner. Actual totals vary, and fitness trackers may produce different estimates depending on how they detect movement.
Marathon vs Half Marathon Distance
A half marathon covers 21.0975 kilometers, or approximately 13.1 miles, exactly half the distance of a full marathon.
Although both events depend heavily on aerobic endurance, doubling the distance changes the demands placed on the body.
| Feature | Half Marathon | Full Marathon |
| Official distance | 21.0975 km | 42.195 km |
| Approximate mileage | 13.1 miles | 26.2 miles |
| Training emphasis | Aerobic endurance and sustained pace | Long-duration endurance and fatigue management |
| Fueling | Depends on intensity and duration | Usually requires planned carbohydrate intake |
| Recovery | Generally shorter | Often requires more recovery time |
Completing a half marathon can help runners develop race experience and assess their endurance. It also provides an opportunity to practice pacing, hydration, and running in crowded conditions.
However, finishing 13.1 miles does not automatically prepare someone for another 13.1 miles at the same pace.
Is a Marathon Twice as Hard as a Half Marathon?
Not necessarily. Physical difficulty does not increase in direct proportion to distance.
A marathon places greater demands on muscular endurance, carbohydrate availability, and pacing discipline. Running at a speed that feels manageable for two hours may become considerably harder after three or four hours.
The body uses both carbohydrates and fats during endurance exercise. As glycogen stores decline, sustaining a demanding pace becomes more difficult, particularly when carbohydrate intake is insufficient.
Training background, running intensity, nutrition, and weather conditions influence how strongly these effects are felt.
How Long Does It Take to Finish a Marathon?
Marathon finishing times depend on fitness, experience, age, course elevation, weather, and pacing.
The fastest male marathoners finish just over two hours, while top international elite women can complete the distance in approximately two hours and 10 to 20 minutes. Recreational runners often take four to six hours, with some events allowing longer finishing times.
A five-hour marathon can be a realistic target for a recreational runner, depending on their training history and experience.
Marathon Pace and Finish Time
The table shows the approximate average pace required to achieve several marathon finishing times.
| Finish Time | Pace per Mile | Pace per Kilometer |
| 2 hours 30 minutes | 5:43 | 3:33 |
| 3 hours | 6:52 | 4:16 |
| 3 hours 30 minutes | 8:01 | 4:59 |
| 4 hours | 9:09 | 5:41 |
| 4 hours 30 minutes | 10:18 | 6:24 |
| 5 hours | 11:27 | 7:07 |
| 5 hours 30 minutes | 12:35 | 7:49 |
| 6 hours | 13:44 | 8:32 |
Paces are rounded to the nearest second and represent the average speed required over the official marathon distance.
Starting at a sustainable pace helps runners avoid excessive fatigue in the later miles. Attempting to recover time after an overly aggressive start rarely works well over such a long distance.
On hilly courses, maintaining consistent effort may require slowing down on climbs rather than trying to preserve identical mile splits.
What Is an Average Marathon Time?
There is no single average marathon time that represents every race or running population.
Mass-participation events attract runners with widely different goals and experience levels. Races with qualifying standards, such as the Boston Marathon, generally have different finishing-time distributions from events open to beginners and charity participants.
Recent race performances, training consistency, and long-run results provide a more useful basis for setting an individual time goal than a broad population average.
What Happens Around Mile 20?
The expression hitting the wall refers to a sudden, substantial decline in running performance during a marathon.
Runners experiencing it may struggle to maintain their pace, feel unusually exhausted, or find that even a modest effort has become difficult. Inadequate carbohydrate availability is a common contributor, while poor pacing, heat, and accumulated muscular fatigue can make the situation worse.
Despite its reputation, mile 20 has no special physiological significance. Some runners struggle earlier, others encounter difficulties closer to the finish, and many complete the race without a dramatic slowdown.
Adequate preparation and a practiced race-day strategy help reduce the risk of severe late-race fatigue.
How to Prepare for Your First Marathon
Marathon training gradually develops the running endurance and physical resilience needed to sustain several hours of exercise.
Many beginner marathon plans last approximately 16 to 20 weeks, assuming the runner already has a consistent running routine. Someone starting without an aerobic fitness base may need several additional months before beginning marathon-specific training.
Build a Consistent Running Base
Start by running regularly before adding demanding long-distance sessions.
Beginner marathon programs generally include several weekly runs, most performed at an easy, conversational effort. Consistent training allows the cardiovascular system, muscles, tendons, and bones to adapt to repeated running loads.
Weekly mileage should increase according to current fitness and recovery rather than a rigid percentage rule. Persistent soreness, declining performance, or difficulty recovering between sessions may indicate that training volume is rising too quickly.
Gradually Extend the Long Run
Long runs improve endurance and help runners become comfortable spending extended periods on their feet.
Many recreational training plans build toward long runs of approximately 16 to 20 miles. The appropriate maximum depends on running experience, pace, and the overall training program.
Completing the entire marathon distance before race day is generally unnecessary for first-time participants. Very long training sessions can create fatigue that outweighs their additional benefits.
Long runs also provide opportunities to test race shoes, clothing, pacing, and nutrition under conditions resembling the event.
Practice Marathon Fueling
Carbohydrate intake helps sustain performance during prolonged endurance exercise.
For extended runs, athletes commonly consume around 30 to 60 grams of carbohydrate per hour. During events lasting more than 2.5 hours, higher intakes of up to 90 grams per hour may be appropriate for runners who have trained their digestive systems to tolerate them.
Energy gels, sports drinks, and carbohydrate-rich foods can provide fuel. The most suitable combination depends on personal preference, gastrointestinal comfort, and how easily the runner can eat or drink while moving.
Hydration needs also vary. Temperature, sweat rate, running speed, and individual physiology all influence fluid requirements. Drinking beyond the body’s needs can cause exercise-associated hyponatremia, a potentially dangerous reduction in blood sodium concentration.
Both fueling and hydration strategies should be tested during training rather than introduced on race day.
Include Recovery and Strength Training
Recovery days help the body adapt to training stress. Strength exercises can complement running by building strength and helping the body handle repeated running stress.
Squats, lunges, calf raises, and hip-strengthening movements are useful additions when performed with appropriate technique and progression.
Adequate sleep, nutrition, and manageable training volume also contribute to recovery. Persistent pain or unusual fatigue warrants reducing training demands and assessing whether additional recovery is needed.
Reduce Training Before Race Day
Most marathon programs include a taper lasting approximately two to three weeks.
During this period, runners reduce overall training volume while maintaining enough intensity to preserve fitness. The aim is to arrive at the starting line rested without losing the adaptations developed during training.
The final weeks are also a good time to review the course profile, confirm the pacing plan, and organize familiar equipment and nutrition supplies.
Frequently Asked Questions
Is a Marathon Exactly 26.2 Miles?
No. The exact distance is 42.195 kilometers, or 26 miles and 385 yards. In decimal form, it is approximately 26.2188 miles, rounded to 26.2.
How Many Miles Is a Half Marathon?
A half marathon covers approximately 13.1094 miles, commonly rounded to 13.1 miles. Its official distance is 21.0975 kilometers.
Can a Beginner Run a Marathon?
Yes. Beginners can work toward a marathon through progressive training, provided they allow enough time to develop endurance and adapt to regular running. The preparation period depends on existing fitness, health, and training experience.
Do You Have to Run the Entire Marathon?
No. Many recreational participants use a run-walk strategy. Some marathons also accommodate walkers, although participants must meet the event’s cutoff times and follow its course rules.
Why Does My GPS Watch Show More Than 26.2 Miles?
GPS inaccuracies and running outside the shortest measured route can increase the recorded distance. A certified course is measured along the shortest permitted line, which runners rarely follow perfectly.
How Far Is a Marathon Compared With a 10K?
A marathon is approximately 4.22 times the distance of a 10K race. It covers 42.195 kilometers compared with 10 kilometers, or about 26.22 miles versus 6.21 miles.