Race Shape › Calculators › Running pace calculator › Sub-20 5k pace
Goal paceSub-20 5k pace
To run a sub-20 5k 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-20 is the club-runner’s badge. It usually means 40+ km a week, intervals and threshold work, and a race-day plan that does not go out at 3:45/km.
Even-pace splits
| Distance | Clock |
|---|---|
| 1 km | 4:00 |
| 2 km | 8:00 |
| 3 km | 11:59 |
| 4 km | 15:59 |
| 5 km | 19:59 |
The fitness behind a sub-20 5k
A sub-20 5k is a VDOT of about 49.8. The same fitness, trained for each distance, runs:
| 10 km | 41:28 (4:09/km) |
|---|---|
| Half marathon | 1:31:50 (4:21/km) |
| Marathon | 3:11:17 (4:32/km) |
So a 10 km in about 41:28 is the clearest sign you are ready. If your recent 10 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 | 5:08–5:53/km at the coast · 5:34/km or slower in Johannesburg |
|---|---|
| Threshold | 4:21/km · 4:43/km in Johannesburg |
| Intervals | 3:56/km · 4:15/km in Johannesburg |
At altitude
The same fitness is slower high up. Raced at about 1 680 m, a sub-20 5k effort comes out near 21:34; to break 20:00 up there you need fitness worth about 18:32 at the coast. Gauteng runners chasing this time are best off choosing a coastal race.
The sub-20 5k training plan lays out the weeks; a plan built from your own recent time says plainly whether the goal is on.
Build my sub-20 5k plan — free to buildSee your whole block before you pay.
Common questions
What pace is a sub-20 5k?
4:00 per kilometre, or 6:26 per mile.
What 10 km time shows I can run a sub-20 5k?
About 41:28 — the same fitness, trained for that distance.
How fast should easy runs be when training for a sub-20 5k?
No faster than 5:08/km at sea level, or 5:34/km in Johannesburg. Slower is fine.
Can I run a sub-20 5k in Johannesburg?
It is harder: at around 1 680 m the same effort is about 8% slower, so you need fitness worth about 18:32 at the coast.
How long does it take to train for a sub-20 5k?
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.