Training plans 5K
The sub-21:00 5K
To break 21:00 for the 5K, you need an average of 4:12 per kilometre — 6:46 per mile — from gun to tape. Most runners get there on 41–56km per week across 5–5 runs, built over roughly 8–11 weeks. Expect three gears in the plan: 5:07–5:42/km for easy runs, roughly 4:27/km for tempo sessions, and 4:12/km for intervals. Your starting fitness decides whether the goal is a season away or further — judge it from a recent race, not a hopeful guess.
Last updated 2026-07-03 · paces computed, not copywritten
Goal pace
4:12/km
6:46/mi
Typical build
8–11 weeks
41–56 km/week
Runs per week
5–5
3 key sessions + easy volume
Required paces
| SESSION | PACE (/KM) |
|---|---|
| Easy runs | 5:07–5:42 |
| Long run | 4:37–5:07 |
| Tempo | 4:27 |
| Intervals | 4:12 |
| Race pace | 4:12 |
Splits at goal pace
| CHECKPOINT | CLOCK |
|---|---|
| 1K | 4:12 |
| 2K | 8:24 |
| 4K | 16:48 |
| Finish | 21:00 |
The table assumes level pacing; most runners land a 21:00 by holding two or three seconds per kilometre back from 4:12 early on.
A typical week
Key session 1
Intervals — reps around 4:12/km (5K effort) with jog recoveries
Key session 2
Tempo — sustained comfortably-hard running near 4:27/km
Long run
The week's cornerstone at 4:37–5:07/km, adding 21:00-pace finishes as race day nears
Plus 2+ easy runs. Everything else is easy running at 5:07–5:42/km — the volume that makes the hard days land.
Asked often
- What pace is a sub-21:00 5K?
- 4:12 per kilometre, held for the full 5K. The runners who break 21:00 are usually the ones still passing people in the last quarter.
- How long should I train for a sub-21:00 5K?
- From a reasonable base, 8–11 weeks. If you're returning from a break, rebuild first — squeezing a 8-week plan into less is how 5K builds break.
- What happens if I miss training weeks?
- If the plan can't adjust, missed weeks turn into injury risk or a blown goal. RunV recalibrates after every run — including the ones that didn't happen — to keep 21:00 in reach.
This fitness at other distances
- Marathon: 3:21:25 equivalent
- Half marathon: 1:36:36 equivalent
- 10K: 43:47 equivalent
Sub-21:00, minus the guesswork
RunV builds your sub-21:00 plan around your week, then recalibrates it after every run — finished, cut short, or missed.
