Free tool
Half marathon pace calculator
21.0975 kilometers — long enough to punish optimism, short enough to race hard. Type your goal time and read the pace it takes, km and miles, split by split.
Goal finish time
Required pace for half marathon
5:41 /km
9:09 /mi
| Split | Cumulative time |
|---|---|
| 1 km | 5:41 |
| 2 km | 11:22 |
| 3 km | 17:04 |
| 4 km | 22:45 |
| 5 km | 28:26 |
| 6 km | 34:07 |
| 7 km | 39:49 |
| 8 km | 45:30 |
| 9 km | 51:11 |
| 10 km | 56:52 |
| 11 km | 1:02:33 |
| 12 km | 1:08:15 |
| 13 km | 1:13:56 |
| 14 km | 1:19:37 |
| 15 km | 1:25:18 |
| 16 km | 1:31:00 |
| 17 km | 1:36:41 |
| 18 km | 1:42:22 |
| 19 km | 1:48:03 |
| 20 km | 1:53:45 |
| 21 km | 1:59:26 |
| Finish | 1:59:59 |
The common goals, in numbers
A 1:30 half demands 4:16 /km (6:52 /mi). 1:45 means 4:59 /km (8:01 /mi). The big one, sub-2:00, works out to 5:41 /km (9:09 /mi) — exactly the pace of a 4:00 marathon, which is why the half is such an honest predictor. A 2:30 half is 7:07 /km (11:27 /mi). Every 5-minute goal from 1:10 to 3:30 lives in the half marathon pace chart.
Race day is built in training
Reysa plans your week and logs every run against it — free on iPhone.