How Many Miles Is a Half Marathon?
Quick Answer
| Unit | Distance |
|---|---|
| Miles (rounded) | 13.1 miles |
| Miles (exact) | 13.1094 miles |
| Kilometers | 21.0975 km |
| Meters | 21,097.5 m |
| Yards | 23,192.5 yards |
| 400 m track laps | ~52.75 laps |
A Half Marathon in Every Unit
The half marathon distance is set by World Athletics at exactly 21.0975 kilometers—half of the full marathon’s 42.195 km. Converting to imperial gives 13.1094 miles, which is universally shortened to the familiar 13.1.
Break it down further and you get 13 miles plus 192.5 yards. That 192.5-yard tail is simply half of the full marathon’s official 385 extra yards. It’s a small number, but at race pace it represents roughly 90 seconds of running—enough to matter if you’re chasing a PR.
On a standard 400-meter track, the half marathon works out to approximately 52.75 laps. Very few people train this way (it would be brutal), but it’s a useful mental image for understanding just how far 13.1 miles really is.
In everyday terms: imagine driving from one side of a mid-size city to the other, then running back. That’s roughly the scope of a half marathon. It demands serious preparation, but it’s achievable for most runners willing to commit 10–14 weeks of consistent training.
How It Compares to a 5K, 10K, and Full Marathon
The half marathon sits between the popular 10K and the full marathon. The table below shows where it lands across the standard road-race distances.
| Race | Miles | Kilometers |
|---|---|---|
| 5K | 3.1 | 5 |
| 10K | 6.2 | 10 |
| Half marathon | 13.1 | 21.1 |
| Marathon | 26.2 | 42.195 |
The jump from 10K to half marathon is roughly 7 miles—more than doubling the distance. Many runners use the half as a stepping stone before attempting the full marathon distance in miles. It’s long enough to test your aerobic base and fueling strategy, but short enough that recovery is typically measured in days rather than weeks.
Compared to the full marathon, the half is exactly half the distance by definition. That means your half-marathon finish time, pace, and training volume all scale in predictable ways—which is why coaches often use a half-marathon result to predict how long it takes to run a marathon.
Typical Half-Marathon Finish Times
Finish times vary enormously depending on fitness, terrain, weather, and the competitive field. The numbers below are rough averages drawn from large road races; treat them as ballpark figures, not benchmarks.
- Overall average: approximately 2:00
- Men’s average: approximately 1:55
- Women’s average: approximately 2:12
- First-timers: commonly finish between 2:15 and 2:45
These are approximate values that shift from race to race. A flat, fast course in cool weather will produce faster averages than a hilly event in summer heat. Elite runners finish closer to 1:00 for men and 1:05 for women, but those times are not relevant reference points for the vast majority of participants.
A realistic goal for a first half marathon is simply to finish feeling strong. Once you have a completion time, you can use the pace table below to set time goals for future races.
How Many Miles Is a Half Marathon—Pace Table
The table below shows the required pace per mile and per kilometer for common half-marathon goal times. Because the distance is exactly 13.1094 miles, these figures are mathematically consistent—they also double as a useful reference for full-marathon goal pacing (the per-mile pace at your half-marathon goal time is close to the pace you’d need for roughly a 2x finish in the full).
| Goal Time | Pace per Mile | Pace per km |
|---|---|---|
| 1:30:00 | 6:52/mi | 4:16/km |
| 1:45:00 | 8:01/mi | 4:59/km |
| 2:00:00 | 9:09/mi | 5:41/km |
| 2:15:00 | 10:18/mi | 6:24/km |
| 2:30:00 | 11:27/mi | 7:07/km |
Pick the goal time closest to your current fitness level and use the corresponding pace as your easy long-run ceiling during training. For a full breakdown of marathon pacing strategy, see the marathon pace chart at marathon-pace-chart.com.
How Long to Train for a Half Marathon
Most structured half-marathon training plans run 10–14 weeks for runners who already have a base of 15–20 miles per week. Complete beginners typically need 16–20 weeks to build safely from scratch.
The key training milestones are:
- Long runs reaching 10–12 miles in the final weeks before taper
- Tempo or threshold sessions to raise your lactate threshold pace
- Easy mileage making up 70–80% of total weekly volume
For a week-by-week breakdown, the 12-week half marathon training plan at ai-run-coach.com walks through each phase in detail, including pacing guidelines and recovery weeks.
Frequently Asked Questions
How many miles is a half marathon?
A half marathon is 13.1 miles, or more precisely 13.1094 miles. This is the official World Athletics standard distance, equivalent to 21.0975 kilometers. The “13.1” shorthand is universally used on race registrations, medal engravings, and car stickers worldwide.
How many kilometers is a half marathon?
A half marathon is 21.0975 kilometers—often rounded to 21.1 km. In meters that’s 21,097.5 m. The distance is fixed by World Athletics as exactly half of the marathon’s 42.195 km, so the kilometer figure is precise rather than an approximation.
How many laps of a track is a half marathon?
On a standard 400-meter outdoor track, a half marathon is approximately 52.75 laps. Because the distance doesn’t divide evenly into 400 m, you’d finish partway through your 53rd lap. Most runners use the track for shorter workouts and complete their long runs on roads or trails.
What is a good half marathon time?
“Good” depends entirely on your age, sex, fitness level, and goals. Rough averages from large road races suggest men finish around 1:55 and women around 2:12, but these are approximate and vary by event. For most recreational runners, completing the race feeling strong and healthy is the primary measure of success.
How long does it take to run a half marathon?
For first-timers, 2:15 to 2:45 is a common finishing window. Experienced runners who’ve built a solid aerobic base often target 1:45 to 2:15. Elite runners finish closer to 1:00–1:05. The pace table in this article can help you estimate your finish time based on a target pace per mile or kilometer.
Is a half marathon exactly half of a marathon?
Yes—by definition. The marathon is set at 42.195 km (26.2188 miles), and the half marathon is exactly 21.0975 km (13.1094 miles). World Athletics certifies both distances, and all official half marathon courses must measure 21.0975 km. There is no rounding or approximation in the official standard; the “21.1” and “13.1” shortcuts are simply convenient shorthand.
Related Guides
- Marathon distance in miles—the full 26.2 explained
- How long does it take to run a marathon?
- Why is a marathon 26.2 miles? The history explained
- Pace calculator and distance guides hub
- Marathon pace chart and finish-time predictor
- 12-week half marathon training plan
Train for Your Half
Knowing the distance is just the first step. Whether you’re targeting 2:30 or pushing for sub-1:45, a personalized plan built around your current fitness makes every mile count. WattRun analyzes your training data and generates a week-by-week half-marathon plan tailored to your pace, schedule, and goals.
Get your free training plan at WattRun
Last updated: May 2026. Sources: World Athletics standard half-marathon distance (21.0975 km).