Race Shape › Calculators › Running pace calculator › Sub-45 10k pace
Goal paceSub-45 10k pace
To run a sub-45 10k you need to average 4:30 per kilometre — 7:15 per mile, 13.3 km/h — and hold it from the first kilometre to the last. Sub-45 is where a 10 km stops being a long run and starts being a race — you have to hold 4:30/km while it hurts.
Even-pace splits
| Distance | Clock |
|---|---|
| 1 km | 4:30 |
| 2 km | 9:00 |
| 3 km | 13:30 |
| 4 km | 18:00 |
| 5 km | 22:30 |
| 6 km | 26:59 |
| 7 km | 31:29 |
| 8 km | 35:59 |
| 9 km | 40:29 |
| 10 km | 44:59 |
The fitness behind a sub-45 10k
A sub-45 10k is a VDOT of about 45.3. The same fitness, trained for each distance, runs:
| 5 km | 21:42 (4:20/km) |
|---|---|
| Half marathon | 1:39:44 (4:44/km) |
| Marathon | 3:27:15 (4:55/km) |
So a 5 km in about 21:42 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 | 5:32–6:21/km at the coast · 6:00/km or slower in Johannesburg |
|---|---|
| Threshold | 4:42/km · 5:05/km in Johannesburg |
| Intervals | 4:15/km · 4:36/km in Johannesburg |
At altitude
The same fitness is slower high up. Raced at about 1 680 m, a sub-45 10k effort comes out near 48:32; to break 45:00 up there you need fitness worth about 41:43 at the coast. Gauteng runners chasing this time are best off choosing a coastal race.
The sub-45 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-45 10k plan — free to buildSee your whole block before you pay.
Common questions
What pace is a sub-45 10k?
4:30 per kilometre, or 7:15 per mile.
What 5 km time shows I can run a sub-45 10k?
About 21:42 — the same fitness, trained for that distance.
How fast should easy runs be when training for a sub-45 10k?
No faster than 5:32/km at sea level, or 6:00/km in Johannesburg. Slower is fine.
Can I run a sub-45 10k in Johannesburg?
It is harder: at around 1 680 m the same effort is about 8% slower, so you need fitness worth about 41:43 at the coast.
How long does it take to train for a sub-45 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.