What Pace Do You Need for a Sub-4 Marathon?
Sub-4 is the most common marathon goal there is, and the pace is simple: 5:41/km or 9:09/mile for 42.2 km. The hard part isn't the number — it's resisting the urge to bank time early and still having legs when the race actually starts after 30 km.
Your goal
Average pace to hit it
Hold this pace from the gun and you cross the line right on 4:00:00.
The 4:00:00 target
Finish time
4:00:00
Average pace
5:41 /km
Halfway
2:00:00
Checkpoints · 4:00:00 goal
| Distance | Block pace | Cumulative |
|---|---|---|
| 5 km | 5:41 | 28:26 |
| 10 km | 5:41 | 56:53 |
| 15 km | 5:41 | 1:25:19 |
| 20 km | 5:41 | 1:53:45 |
| Halfway · 21.1 km | 5:41 | 2:00:00 |
| 25 km | 5:41 | 2:22:12 |
| 30 km | 5:41 | 2:50:38 |
| 35 km | 5:41 | 3:19:05 |
| 40 km | 5:41 | 3:47:31 |
| Finish · 42.2 km | 5:41 | 4:00:00 |
How to pace it.
Slight negative split
Go through halfway between 2:00:00 and 2:00:30, feeling almost too easy, then aim to run the second half a touch quicker. Most people who miss sub-4 don't miss it because 5:41/km was too fast — they miss it because they ran 5:25/km for the first 15 km and paid for it with 6:30s at the end. A controlled first half is the whole plan.
What blows it up.
Running 5:25/km early because goal pace feels slow. It always feels slow in the first 10 km.
Banking time before halfway. A 1:55 first half almost never becomes a 3:55 marathon — it becomes a 4:10.
Following the 4:00 pace group blindly when it's running hot. Check the splits yourself.
Skipping fuel in the first hour because you feel fine. Sub-4 means roughly 4 hours of running — you cannot do it on stored glycogen alone.
Chasing exact splits on hills or into wind instead of running even effort.
Walking aid stations without practising the restart. Practise it on long runs if it's part of your plan.
Adjust for the course
Same idea, different terrain.
At goal pace your checkpoints are roughly 56:52 at 10 km, 1:53:45 at 20 km, and 2:50:38 at 30 km, with halfway at 2:00:00.
On flat courses like Berlin, Chicago, or Valencia, even pacing works well — just don't let the crowd pull you out fast in the first 5 km.
On rolling courses, run by effort. Losing 10–15 seconds on an uphill kilometre is fine; trying to claw it back immediately is not.
The 4:00 pace group can be a great tool, but groups often run 1–2 minutes ahead of schedule. Know your own splits.
If it's warm, adjust the goal early. A controlled 4:05 in heat beats blowing up at 32 km chasing sub-4.
Marathon pace — FAQ
What pace per km do I need for a sub-4 marathon?
5:41 per km. More precisely, 5:41.3/km over 42.195 km — so running 5:40/km gives you a small but real buffer.
What pace per mile is a 4-hour marathon?
9:09 per mile. More precisely, 9:09.2/mile over 26.2 miles.
What halfway split do I need to break 4 hours?
Even pacing puts you through halfway at exactly 2:00:00. In practice, aim for 2:00:00 to 2:00:30 with a controlled effort, then run the second half slightly quicker.
Should I run even or negative splits for a sub-4 marathon?
A slight negative split. Keep the first half controlled, settle into rhythm, and press from 30 km if your legs are still there. Going out fast and fading is the most common way people miss sub-4.
What 5K or 10K time suggests I can run a sub-4 marathon?
Roughly 25:00 for 5K or 52:00 for 10K. Those are indicators, not guarantees — weekly mileage, long runs, and fueling matter just as much over 42.2 km.
Is a sub-4 marathon a good time?
Yes. Breaking 4 hours puts you ahead of the typical finisher at most big-city marathons, and it's the most popular time goal among recreational marathoners.
How should I fuel for a 4-hour marathon?
Start taking carbs 25–30 minutes in and keep fueling every 25–35 minutes — roughly 30–60 g of carbs per hour. Over 4 hours, fueling mistakes cost more time than pacing mistakes.
Can I walk aid stations and still break 4 hours?
Yes, if you plan for it. A 10–15 second walk through an aid station costs little if your running pace is 5:38–5:40/km. Just practise the restart on long runs so it doesn't turn into a long walk.