Racing smarter
What pace is a 3:30 marathon?
3:30:00 for the marathon is 4:59/km (8:01/mi), held the whole way. Halfway on even pace is 1:45:00. Most watches measure the course long, so the pace you actually need on the screen is nearer 4:54/km.
| What | Number | The qualifier |
|---|---|---|
| Pace needed | 4:59/km (8:01/mi) | even, start to finish |
| Halfway (even) | 1:45:00 | 1:47:06 on a 2% negative split |
| Watch pace at 1.5% overage | 4:54/km (7:53/mi) | what the screen has to show |
| Distance | 42.195 km (26.22 mi) | the measured course, not the watch |
What pace is a 3:30 marathon?
3:30:00 over 42.195 km (26.22 mi) is 4:59/km (8:01/mi), held from the first step to the last. There is no rounding slack in that number: run the first kilometre at 5:09/km and you have already spent ten seconds you will not get back cheaply.
A 3:30 marathon is the most common serious target after a first finish. It is also where the maths gets unforgiving: you need roughly a 1:38 half, and most people attempting it have run a 1:45. The training behind it is usually 50 to 70 km a week with one long run over 28 km. The failure mode is specific. Runners hold the pace comfortably to 25 km, then lose 10 to 15 seconds a kilometre over the last 10 km and finish around 3:36. That is not the wall. That is starting at a pace your endurance supported for 25 km and not 42. If your half time is not under 1:40, plan the day around 3:35 and be pleased.
What the splits look like
| Kilometre | Split | Elapsed |
|---|---|---|
| 1 | 4:59 | 4:59 |
| 5 | 4:59 | 24:53 |
| 10 | 4:59 | 49:46 |
| 15 | 4:59 | 1:14:39 |
| 20 | 4:59 | 1:39:32 |
| 25 | 4:59 | 2:04:25 |
| 30 | 4:59 | 2:29:18 |
| 35 | 4:59 | 2:54:11 |
| 40 | 4:59 | 3:19:05 |
| 42.195 | 0:58 | 3:30:00 |
And in miles, for a course measured that way:
| Mile | Split | Elapsed |
|---|---|---|
| 1 | 8:01 | 8:01 |
| 3 | 8:01 | 24:02 |
| 6 | 8:01 | 48:03 |
| 9 | 8:01 | 1:12:05 |
| 12 | 8:01 | 1:36:07 |
| 15 | 8:01 | 2:00:09 |
| 18 | 8:01 | 2:24:10 |
| 21 | 8:01 | 2:48:12 |
| 24 | 8:01 | 3:12:14 |
| 26.22 | 1:45 | 3:30:00 |
Where should I be at halfway?
Even pace puts you through halfway at 1:45:00. Most people who finish this time went through slightly slower than that, not faster — a 2% negative split means halfway at 1:47:06 and a second half of 1:42:54.
The decision rule for race day: if you reach halfway more than 2:06 ahead of 1:45:00, you are not ahead of schedule, you are borrowing. Ease back to 4:59/km (8:01/mi) and hold it.
What if my watch measures the course long?
Almost every watch does. A marathon that reads 1.5% long on your wrist means you have to run 4:54/km by the watch to finish in 3:30:00 by the clock. That is the pace to put on the screen, and it is why pacing off a watch's average-pace field alone tends to leave people a minute or two short.
Questions runners actually ask
- Is a 3:30 marathon a good time?
- Good is a comparison, and it depends who with. Whether it is achievable for you is the answerable question: it comes down to a recent race, your weekly volume and your longest run. The race predictor puts numbers on all three.
- Should I run even splits or negative splits?
- Even, planned; slightly negative, executed. Going through halfway 1-2% slower than even pace costs almost nothing if you are strong at the end, and saves the race if you are not.
Sources
- Hanley B et al. Pacing profiles of senior athletes at the World Athletics Championships. Front Sports Act Living 4:964905, 2022 primary
- Deaner RO et al. Men are more likely than women to slow in the marathon. Med Sci Sports Exerc 47(3):607-616, 2015 primary
- World Athletics Competition Rules, Book C2.1 — course measurement and the short course prevention factor reference
Changelog
- — First published.