Marathon Pace Calculator
Enter a goal marathon finish time to get the pace you need to hold, your halfway target, and cumulative splits.
How to use the marathon pace calculator
- Enter your goal marathon finish time (h:mm:ss).
- Click Calculate pace.
- Use the per-km/mile pace and the split table to pace your race.
Even pacing wins marathons
Going out faster than goal pace in the first half is the most common marathon mistake. The split table gives you checkpoints so you can hold steady and avoid the late-race fade.
Why even pacing wins marathons
The marathon punishes early enthusiasm more than any other distance. Glycogen is finite, and running even slightly too fast in the first half accelerates the moment you run out, the dreaded 'wall' around 30-32 km.
The split table here exists to keep you honest in those first kilometres when you feel fresh and fast. Banking time early almost never pays off; the runners who negative-split or hold even pace are the ones still moving well in the final 10 km.
Translating goal pace into race-day execution
Your goal pace is an average, not a target for every kilometre. Aid stations, turns, crowds, and small hills will nudge individual splits around. Aim to hit your cumulative time at each 5 km marker rather than obsessing over each kilometre, and start 2-3 seconds per kilometre slower than goal pace to leave room for the inevitable late-race fade.
Frequently asked questions
What pace is a sub-4 hour marathon?
A 4:00:00 marathon requires about 5:41 per km (9:09 per mile) held for the full 42.195 km.
What pace is a sub-3 hour marathon?
A 3:00:00 marathon requires roughly 4:16 per km (6:52 per mile) — a demanding pace that needs significant training.
What pace is a sub-4-hour marathon?
About 5:41 per kilometre or 9:09 per mile, held for the full 42.195 km. Use the split table to set 5 km checkpoints.
How much faster should my training long runs be?
Most long runs should be slower than goal marathon pace, with some segments at goal pace to rehearse it. Running every long run at goal pace tends to leave you tired rather than sharp.
Why did I hit the wall despite hitting my pace?
The wall is usually about fuelling and starting too fast, not just pace. Practising race-day carbohydrate intake and pacing the first half conservatively are the main defences.
Related tools
Half Marathon Pace Calculator
Enter a goal half marathon finish time to get your required pace, halfway split, and cumulative split targets.
Pace Calculator
Enter any two of distance, time, and pace — get the third instantly, plus per-km and per-mile splits.
Race Fueling Calculator
Plan your carbohydrate, fluid and sodium intake for a long race based on your expected duration.