Running calculator
Half Marathon Pace Calculator
Calculate your half marathon finish time, pace, speed, and kilometer or mile splits for 21.0975 km.
Your pace is 4:59 min/km
- Pace per km
- 4:59 min/km
- Pace per mile
- 8:01 min/mile
- Finish time
- 1:45:00
- Distance
- 21.1 km / 13.11 mi
- Speed
- 12.06 km/h
- Speed
- 7.49 mph
Splits
| Split | Cumulative time |
|---|---|
| 1 km | 4:59 |
| 2 km | 9:57 |
| 3 km | 14:56 |
| 4 km | 19:54 |
| 5 km | 24:53 |
| 6 km | 29:52 |
| 7 km | 34:50 |
| 8 km | 39:49 |
| 9 km | 44:48 |
| 10 km | 49:46 |
| 11 km | 54:45 |
| 12 km | 59:43 |
| 13 km | 1:04:42 |
| 14 km | 1:09:41 |
| 15 km | 1:14:39 |
| 16 km | 1:19:38 |
| 17 km | 1:24:36 |
| 18 km | 1:29:35 |
| 19 km | 1:34:34 |
| 20 km | 1:39:32 |
| 21 km | 1:44:31 |
| 21.1 km finish | 1:45:00 |
How to calculate half marathon pace
Divide your target half marathon time by 21.0975 kilometers or 13.1 miles.
Example half marathon pace calculation
A 1:45:00 half marathon averages 4:59 min/km, or about 8:01 min/mile.
Half marathon splits
For longer races, checking both kilometer and mile splits makes it easier to stay on target at aid stations and markers.
Frequently asked questions
How long is a half marathon?
A half marathon is 21.0975 kilometers, or about 13.1 miles.
Should I use kilometer or mile splits?
Use the split unit that matches the race markers, then check the equivalent pace for your watch settings.