1:38 half marathon pace
A 1:38 half marathon is 4:39/km (7:29/mi), 12.9 km/h.
| Change | Time | Pace |
|---|---|---|
| −2:00 | 1:36:00 | 4:337:19 |
| −1:30 | 1:36:30 | 4:347:22 |
| −1:00 | 1:37:00 | 4:367:24 |
| −0:30 | 1:37:30 | 4:377:26 |
| Your target /km | ||
| +0:30 | 1:38:30 | 4:407:31 |
| +1:00 | 1:39:00 | 4:427:33 |
| +1:30 | 1:39:30 | 4:437:35 |
| +2:00 | 1:40:00 | 4:447:38 |
Arrow keys nudge the value. Hold Shift for bigger steps.
Finish times at 4:39 per km
| Distance | Finish time |
|---|---|
| 1K | 4:39 |
| 1 mile | 7:29 |
| 5K | 23:14 |
| 10K | 46:27 |
| 10 miles | 1:14:45 |
| Half marathon | 1:38:00 |
| Marathon | 3:16:00 |
| 50K | 3:52:15 |
Splits for a 1:38 half marathon
| km | Split | Elapsed |
|---|---|---|
| 1 | 4:39 | 4:39 |
| 2 | 4:39 | 9:17 |
| 3 | 4:39 | 13:56 |
| 4 | 4:39 | 18:35 |
| 5 | 4:39 | 23:14 |
| 6 | 4:39 | 27:52 |
| 7 | 4:39 | 32:31 |
| 8 | 4:39 | 37:10 |
| 9 | 4:39 | 41:48 |
| 10 | 4:39 | 46:27 |
| 11 | 4:39 | 51:06 |
| 12 | 4:39 | 55:44 |
| 13 | 4:39 | 1:00:23 |
| 14 | 4:39 | 1:05:02 |
| 15 | 4:39 | 1:09:41 |
| 16 | 4:39 | 1:14:19 |
| 17 | 4:39 | 1:18:58 |
| 18 | 4:39 | 1:23:37 |
| 19 | 4:39 | 1:28:15 |
| 20 | 4:39 | 1:32:54 |
| 21 | 4:39 | 1:37:33 |
| Final 0.098 km | 0:27 | 1:38:00 |
| Mile | Split | Elapsed |
|---|---|---|
| 1 | 7:29 | 7:29 |
| 2 | 7:29 | 14:57 |
| 3 | 7:29 | 22:26 |
| 4 | 7:29 | 29:54 |
| 5 | 7:29 | 37:23 |
| 6 | 7:29 | 44:51 |
| 7 | 7:29 | 52:20 |
| 8 | 7:29 | 59:48 |
| 9 | 7:29 | 1:07:17 |
| 10 | 7:29 | 1:14:45 |
| 11 | 7:29 | 1:22:14 |
| 12 | 7:29 | 1:29:42 |
| 13 | 7:29 | 1:37:11 |
| Final 0.109 mi | 0:49 | 1:38:00 |
What a 1:38 half marathon predicts
Estimate| Distance | Estimated time |
|---|---|
| 5K | 21:18 |
| 10K | 44:25 |
| 10 miles | 1:13:33 |
| Marathon | 3:24:19 |
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.
1:25 to 1:40 is where even pacing pays
Bank time early and you’ll give it back, with interest, in the last 5 km. Hold the same pace from the start and let the effort rise instead.
One quality session a week, a tempo run or intervals at goal pace, plus a weekly long run builds most of what you need. Run the rest easy.
You’ll race for well over an hour and a quarter. A gel or sports drink in the second half helps; use one you’ve tried in training.
Pace questions runners ask
- What pace do I need for a 1:38 half marathon?
- A 1:38 half marathon is 4:39/km (7:29/mi), 12.9 km/h, held for the whole race.
- What treadmill speed is 1:38 half marathon pace?
- Set the treadmill to 12.9 km/h or 8.0 mph to run 4:39/km (7:29/mi).
- Where should I be at halfway in a 1:38 half marathon?
- With even pacing you pass halfway in 49:00; with a negative split, a little later.
- What does a 1:38 half marathon predict for other distances?
- The Riegel formula estimates 21:18 for the 5K, 44:25 for the 10K, 1:13:33 for the 10-mile race, 3:24:19 for the marathon, assuming you’ve trained for each distance.