Race Shape › Calculators › Running pace calculator › Sub-3:15 marathon pace
Goal paceSub-3:15 marathon pace
To run a sub-3:15 marathon you need to average 4:37 per kilometre — 7:26 per mile, 13.0 km/h — and reach halfway in 1:37:30. Sub-3:15 needs about 4:37/km and the sort of weekly mileage — 60 km and up — that makes marathon pace feel routine.
Even-pace splits
| Distance | Clock |
|---|---|
| 5 km | 23:06 |
| 10 km | 46:13 |
| 15 km | 1:09:19 |
| 20 km | 1:32:25 |
| 21.1 km | 1:37:29 |
| 25 km | 1:55:32 |
| 30 km | 2:18:38 |
| 35 km | 2:41:44 |
| 40 km | 3:04:50 |
| 42.2 km | 3:14:59 |
The fitness behind a sub-3:15 marathon
A sub-3:15 marathon is a VDOT of about 48.7. The same fitness, trained for each distance, runs:
| 5 km | 20:24 (4:05/km) |
|---|---|
| 10 km | 42:17 (4:14/km) |
| Half marathon | 1:33:40 (4:26/km) |
So a half marathon in about 1:33:40 is the clearest sign you are ready. If your recent half marathon is well slower than that, the goal is still on — it needs a block, not a hopeful race day.
Training paces for it
| Easy | 5:14–5:59/km at the coast · 5:40/km or slower in Johannesburg |
|---|---|
| Threshold | 4:26/km · 4:48/km in Johannesburg |
| Intervals | 4:00/km · 4:20/km in Johannesburg |
At altitude
The same fitness is slower high up. Raced at about 1 680 m, a sub-3:15 marathon effort comes out near 3:30:20; to break 3:15:00 up there you need fitness worth about 3:00:47 at the coast. Gauteng runners chasing this time are best off choosing a coastal race.
The sub-3:15 marathon training plan lays out the weeks; a plan built from your own recent time says plainly whether the goal is on.
Build my sub-3:15 marathon plan — free to buildSee your whole block before you pay.
Common questions
What pace is a sub-3:15 marathon?
4:37 per kilometre, or 7:26 per mile.
What half marathon time shows I can run a sub-3:15 marathon?
About 1:33:40 — the same fitness, trained for that distance.
How fast should easy runs be when training for a sub-3:15 marathon?
No faster than 5:14/km at sea level, or 5:40/km in Johannesburg. Slower is fine.
Can I run a sub-3:15 marathon in Johannesburg?
It is harder: at around 1 680 m the same effort is about 8% slower, so you need fitness worth about 3:00:47 at the coast.
How long does it take to train for a sub-3:15 marathon?
It depends on the gap. Improving about 0.4% a week is a reasonable rate for a trained runner, so a 5% gap is roughly 12–13 weeks. The plan page works it out.