Race Shape › Calculators › Running pace calculator › Sub-40 10k pace
Goal paceSub-40 10k pace
To run a sub-40 10k you need to average 4:00 per kilometre — 6:26 per mile, 15.0 km/h — and hold it from the first kilometre to the last. Sub-40 is serious club running: 50+ km a week, intervals near 3:48/km and patience in the first 5 km.
Even-pace splits
| Distance | Clock |
|---|---|
| 1 km | 4:00 |
| 2 km | 8:00 |
| 3 km | 12:00 |
| 4 km | 16:00 |
| 5 km | 20:00 |
| 6 km | 23:59 |
| 7 km | 27:59 |
| 8 km | 31:59 |
| 9 km | 35:59 |
| 10 km | 39:59 |
The fitness behind a sub-40 10k
A sub-40 10k is a VDOT of about 51.9. The same fitness, trained for each distance, runs:
| 5 km | 19:18 (3:52/km) |
|---|---|
| Half marathon | 1:28:33 (4:12/km) |
| Marathon | 3:04:38 (4:23/km) |
So a 5 km in about 19:18 is the clearest sign you are ready. If your recent 5 km is well slower than that, the goal is still on — it needs a block, not a hopeful race day.
Training paces for it
| Easy | 4:58–5:41/km at the coast · 5:23/km or slower in Johannesburg |
|---|---|
| Threshold | 4:12/km · 4:33/km in Johannesburg |
| Intervals | 3:48/km · 4:07/km in Johannesburg |
At altitude
The same fitness is slower high up. Raced at about 1 680 m, a sub-40 10k effort comes out near 43:09; to break 40:00 up there you need fitness worth about 37:05 at the coast. Gauteng runners chasing this time are best off choosing a coastal race.
The sub-40 10k training plan lays out the weeks; a plan built from your own recent time says plainly whether the goal is on.
Build my sub-40 10k plan — free to buildSee your whole block before you pay.
Common questions
What pace is a sub-40 10k?
4:00 per kilometre, or 6:26 per mile.
What 5 km time shows I can run a sub-40 10k?
About 19:18 — the same fitness, trained for that distance.
How fast should easy runs be when training for a sub-40 10k?
No faster than 4:58/km at sea level, or 5:23/km in Johannesburg. Slower is fine.
Can I run a sub-40 10k in Johannesburg?
It is harder: at around 1 680 m the same effort is about 8% slower, so you need fitness worth about 37:05 at the coast.
How long does it take to train for a sub-40 10k?
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.