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Half Marathon Pace Calculator
Your run
A half marathon is 13.1 miles (21.0975 km).
Example: a 2:00:00 finish works out to 9:10 per mile and 5:41 per kilometre.
Behind the numbers
How half marathon pace is calculated
Pace is simply your total time divided by the race distance. A half marathon is 13.1 miles, or 21.0975 kilometres, so divide your finish time in seconds by 13.1 to get your pace per mile, or by 21.0975 to get your pace per kilometre. To work the other way, multiply your pace in seconds by the distance to get the finish time.
7,200 seconds ÷ 13.1 miles = 549.6 seconds per mile = 9 minutes 10 seconds per mile. Per kilometre: 7,200 ÷ 21.0975 = 341.3 seconds = 5:41 per km.
A few comparisons
Example paces and finish times
| Finish time | Pace per mile | Pace per km | Finish from pace |
|---|---|---|---|
| 1:45:00 | 8:01 | 4:59 | 8:00 per mile → 1:44:48 |
| 2:00:00 | 9:10 | 5:41 | 9:00 per mile → 1:57:54 |
| 2:30:00 | 11:27 | 7:07 | 10:00 per mile → 2:11:00 |
Run your race, not someone else's.
Pick a target pace you can hold for the full 13.1 miles — starting 10 seconds per mile too fast in the first 5K is the most common way to miss a goal time.
Train at your goal pace in short blocks: 3 × 2 miles at race pace with a short jog between builds the feel of the pace without exhausting you.
Check the course profile before race day — a hilly course adds 1 to 3 minutes over a flat one at the same effort, so adjust your target pace for the hills.
Use the pace-per-km figure if your watch or race is in kilometres — mixing miles and kilometres mid-race is an easy way to run the wrong pace.
Good to know
Your half marathon pace questions, answered.
What is a good half marathon pace?
It depends on your experience. A 2:00:00 finish, about 9:10 per mile, is a common goal for recreational runners, while experienced runners often aim for under 1:45:00, about 8:01 per mile. Elite runners finish in around 1:00:00, close to 4:35 per mile.
How long is a half marathon?
A half marathon is 13.1 miles, or 21.0975 kilometres — exactly half the distance of a full marathon (26.2 miles / 42.195 km).
How do I convert pace per mile to pace per km?
Divide your pace per mile by 1.60934. For example, 9:10 per mile is 550 seconds, and 550 ÷ 1.60934 = 342 seconds, or 5:42 per km. This calculator shows both units for every result.
What pace do I need to finish in under 2 hours?
You need to run faster than 9:10 per mile (5:41 per km). A 2:00:00 finish over 13.1 miles works out to 549.6 seconds per mile, so holding 9:09 per mile or quicker gets you under two hours.