1:43 half marathon pace
A 1:43 half marathon is 4:53/km (7:51/mi), 12.3 km/h.
| Change | Time | Pace |
|---|---|---|
| −2:00 | 1:41:00 | 4:477:42 |
| −1:30 | 1:41:30 | 4:497:45 |
| −1:00 | 1:42:00 | 4:507:47 |
| −0:30 | 1:42:30 | 4:527:49 |
| Your target /km | ||
| +0:30 | 1:43:30 | 4:547:54 |
| +1:00 | 1:44:00 | 4:567:56 |
| +1:30 | 1:44:30 | 4:577:58 |
| +2:00 | 1:45:00 | 4:598:01 |
Arrow keys nudge the value. Hold Shift for bigger steps.
Finish times at 4:53 per km
| Distance | Finish time |
|---|---|
| 1K | 4:53 |
| 1 mile | 7:51 |
| 5K | 24:25 |
| 10K | 48:49 |
| 10 miles | 1:18:34 |
| Half marathon | 1:43:00 |
| Marathon | 3:26:00 |
| 50K | 4:04:06 |
Splits for a 1:43 half marathon
| km | Split | Elapsed |
|---|---|---|
| 1 | 4:53 | 4:53 |
| 2 | 4:53 | 9:46 |
| 3 | 4:53 | 14:39 |
| 4 | 4:53 | 19:32 |
| 5 | 4:53 | 24:25 |
| 6 | 4:53 | 29:18 |
| 7 | 4:53 | 34:10 |
| 8 | 4:53 | 39:03 |
| 9 | 4:53 | 43:56 |
| 10 | 4:53 | 48:49 |
| 11 | 4:53 | 53:42 |
| 12 | 4:53 | 58:35 |
| 13 | 4:53 | 1:03:28 |
| 14 | 4:53 | 1:08:21 |
| 15 | 4:53 | 1:13:14 |
| 16 | 4:53 | 1:18:07 |
| 17 | 4:53 | 1:23:00 |
| 18 | 4:53 | 1:27:53 |
| 19 | 4:53 | 1:32:46 |
| 20 | 4:53 | 1:37:39 |
| 21 | 4:53 | 1:42:31 |
| Final 0.098 km | 0:29 | 1:43:00 |
| Mile | Split | Elapsed |
|---|---|---|
| 1 | 7:51 | 7:51 |
| 2 | 7:51 | 15:43 |
| 3 | 7:51 | 23:34 |
| 4 | 7:51 | 31:26 |
| 5 | 7:51 | 39:17 |
| 6 | 7:51 | 47:09 |
| 7 | 7:51 | 55:00 |
| 8 | 7:51 | 1:02:51 |
| 9 | 7:51 | 1:10:43 |
| 10 | 7:51 | 1:18:34 |
| 11 | 7:51 | 1:26:26 |
| 12 | 7:51 | 1:34:17 |
| 13 | 7:51 | 1:42:08 |
| Final 0.109 mi | 0:52 | 1:43:00 |
What a 1:43 half marathon predicts
Estimate| Distance | Estimated time |
|---|---|
| 5K | 22:23 |
| 10K | 46:41 |
| 10 miles | 1:17:18 |
| Marathon | 3:34:45 |
These are estimates from the Riegel formula, T2 = T1 × (D2 ÷ D1)^1.06. They assume you’ve trained for the other distance, so treat them as a guide, not a promise.
Between 1:40 and 1:55, a few seconds per km change the goal
Two round-number goals sit in this band, 1:45 and 1:50. The ladder above shows how few seconds per km separate them, which makes it easier to pick the one you can hold.
Easy long runs and one session a week at goal pace or a little quicker get most runners here. Practise goal pace near the end of a long run, when your legs are tired.
Plan a gel or a few mouthfuls of sports drink around halfway, and take water when it’s offered.
Pace questions runners ask
- What pace do I need for a 1:43 half marathon?
- A 1:43 half marathon is 4:53/km (7:51/mi), 12.3 km/h, held for the whole race.
- What treadmill speed is 1:43 half marathon pace?
- Set the treadmill to 12.3 km/h or 7.6 mph to run 4:53/km (7:51/mi).
- Where should I be at halfway in a 1:43 half marathon?
- With even pacing you pass halfway in 51:30; with a negative split, a little later.
- What does a 1:43 half marathon predict for other distances?
- The Riegel formula estimates 22:23 for the 5K, 46:41 for the 10K, 1:17:18 for the 10-mile race, 3:34:45 for the marathon, assuming you’ve trained for each distance.