Pace Calculator · Practical guide
What Pace Do I Need to Run a Sub 4 Hour Marathon?
The magic number is about 9:09 per mile — held for 26.2 miles.
At a glance
The Short Answer
To finish a marathon under 4:00:00 you need to average about 9:09 per mile (5:41 per kilometer) — and hold it for 26.2 miles. That pace puts you across the line in roughly 3:59:58 with seconds to spare.
Interactive tool
Pace Calculator
Enter your own values, then compare the result with the examples below.
Results
The Splits You Need
| Checkpoint | Even-Pace Split |
|---|---|
| 5K | 28:26 |
| 10K | 56:53 |
| Half marathon | 2:00:00 |
| Finish (26.2 mi) | 4:00:00 |
Build In a Buffer
Even pacing to exactly 4:00:00 leaves no room for water stops, hills, or a crowded start. Most coaches suggest training toward a 9:00–9:05 per mile race pace — banking a minute or two of cushion — and running a slight negative split, with the second half a touch faster than the first.
Can You Actually Hold It?
Check with the Riegel prediction above: a recent half marathon of about 1:55 or faster mathematically predicts a 4:00 marathon. Because long races punish gaps in endurance training, many coaches prefer to see closer to 1:50 before committing to the goal.
Frequently Asked Questions
What pace is a 3:45 marathon?
About 8:35 per mile or 5:20 per kilometer, held for the full 26.2 miles.
Is a sub-4-hour marathon a good time?
Yes — it is a widely recognized benchmark that places you ahead of the majority of finishers in most large marathons.
How do I practice marathon pace in training?
Work goal-pace segments into your long runs, gradually extending them from a few miles to 10 or more at 9:09 per mile. Your body needs to learn what that effort feels like deep into a run.
What pace is a 3:30 marathon?
About 8:01 per mile or 4:59 per kilometer — roughly a minute per mile faster than the sub-4 target.