To run a half marathon in under two hours, you need to average 5:41 per kilometer — or 9:09 per mile. Hit that pace and you'll cross the line at 1:59:59 or faster. The rest of this guide shows where that number comes from, the splits to aim for, and how to actually hold it on race day.
How pace math works
Pace is simply total time divided by distance. A half marathon is 21.0975 km (13.1094 miles), and two hours is 7,200 seconds. So the required pace is 7,200 ÷ 21.0975 = 341.3 seconds per km, which is 5 minutes 41 seconds per km. In miles: 7,200 ÷ 13.1094 = 549.2 seconds per mile, or 9:09 per mile. Run any faster than that average and you break two hours.
Mile-by-mile split table
Here are the cumulative times you should hit at each mile to finish in 1:59:59, running even splits:
| Mile | Cumulative time |
|---|---|
| 1 | 9:09 |
| 3 | 27:27 |
| 5 | 45:45 |
| 6.55 (halfway) | 59:59 |
| 10 | 1:31:30 |
| 13.1 | 1:59:59 |
How to train for this pace
Holding 5:41/km for 21 km takes both endurance and a comfortable cruising gear. Two workouts do most of the work: tempo runs (sustained 20–40 minutes at or just faster than goal pace, to teach your body the effort) and long runs (building to 18–20 km to bank the endurance). Easy runs in between keep your aerobic base growing without burning you out. If goal pace feels close to all-out in training, you likely need more base before targeting sub-2.
Don't go out too fast
The most common way to miss the goal is starting too quick. Banking time early feels smart but spends energy at a rate you can't sustain, leading to a slowdown (a positive split) that costs more than the time you banked. Aim for even splits, or a slight negative split — running the second half a touch faster than the first. Settling into 5:41/km from the gun, rather than 5:20/km, is what gets most runners under two hours.
Thinking in kilometers but training by miles (or vice versa)? Our km to miles chart keeps the conversions straight.
Pace vs. speed
Pace and speed describe the same thing from opposite directions. Pace is time per distance (minutes per km or mile) and goes down as you get faster; speed is distance per time (km/h or mph) and goes up. To convert, divide: 60 minutes ÷ your pace in minutes gives speed. A 5:41/km pace is 60 ÷ 5.683 = 10.6 km/h. Runners usually think in pace because it's what you read off a watch and hold during a race, while treadmills and cyclists tend to use speed.
Converting between km and mile pace
Since a mile is 1.609 km, a per-mile pace is always a bigger number than the same per-km pace. To convert km pace to mile pace, multiply by 1.609; to go the other way, divide. A 5:00/km pace is 5:00 × 1.609 = 8:03/mile. The sub-2-hour half pace of 5:41/km works out to 9:09/mile. Mixing the two up is a classic mistake — a "9:00 pace" is comfortably sub-2 in miles but well over 2 hours if you accidentally run it per kilometer.
Adjusting for hills, heat, and terrain
Your flat, cool-weather pace won't hold everywhere. Hills cost more time on the climbs than you recover on the descents, heat and humidity raise your effort at any given pace, and soft trails or wind slow you down. Plan by effort, not just the clock: on a hilly or hot course, target an average pace and let individual splits vary, rather than forcing 5:41 up every incline and blowing up. Recalculate your goal pace for the specific course when you can.
A simple pacing plan for race day
- Start 5–10 seconds per km slower than goal pace for the first 1–2 km to warm into it.
- Settle onto goal pace and hold it through the middle third — this is where discipline pays off.
- From two-thirds in, hold or gently push if you feel strong, aiming for an even or slightly negative split.
- Use your watch's lap function per km/mile and compare to your split table so you catch drift early.
Training to hold the pace
Two sessions a week do most of the work. Tempo runs — 20 to 40 minutes at or just faster than goal pace — teach your body the effort and clear lactate efficiently. Long runs, building gradually toward 18–20 km, supply the endurance to hold pace to the finish rather than fading. Fill the rest of the week with easy aerobic running and at least one rest day. If goal pace feels near-maximal in training, build more base before targeting it on race day.