Race Shape › Running › Sub-40 10k
Running · goal timeSub-40 10k training plan
To run a 10 km under 40:00 you need to average 4:00 per kilometre. That takes a fitness of about VDOT 51.9 — the same athlete who can run a 5 km in 19:18, a half marathon in 1:28:33, a marathon in 3:04:38. From a starting point about 5% slower, a focused 13-week block is a realistic way to get there; from much further back it takes more than one build, and the table below says how many weeks.
Build my sub-40 10k plan — freeSet from your own time trial. The first week is yours to train on before you decide.
The pace, and the splits
| Goal | 40:00 for the 10 km |
|---|---|
| Average pace | 4:00 per km |
| At 5 km | 20:00 |
What that fitness looks like at other distances
A goal time is really a fitness level. At VDOT 51.9, Jack Daniels' model predicts:
| 5 km | 19:18 |
|---|---|
| Half marathon | 1:28:33 |
| Marathon | 3:04:38 |
If you can already run close to these at a shorter distance, the fitness is there and the goal is about endurance and pacing. If you cannot, the goal is about fitness first.
How long it takes from where you are
| Your 10 km today | Realistic time to the goal |
|---|---|
| 41:12 — 3% short | About 8 weeks of consistent training |
| 42:24 — 6% short | About 15 weeks of consistent training |
| 44:00 — 10% short | About 23 weeks of consistent training |
| 46:24 — 16% short | More than one training block. Build to an interim goal first. |
Based on roughly 0.4% improvement a week for a trained runner, capped at about 12% for a single block — the same rule the plan uses when it tells you whether your own goal is realistic.
Training paces at this fitness
| Easy — a ceiling, not a target | 4:58/km or slower |
|---|---|
| Marathon pace | 4:27/km |
| Threshold | 4:12/km |
| Interval (VO₂max) | 3:48/km |
| Repetition | 3:33/km |
These are the paces of the goal, which you train toward. A plan built from your own time trial starts from where you are now and moves them as you get fitter.
A 14-week block toward it
Generated for a runner currently doing 42:00 for the 10 km, on about 47 km a week. Volume rises no more than 10% a week and every fourth week comes down.
| Week | Phase | Volume | Load | |
|---|---|---|---|---|
| 1 | Base | 47 km | 226 | |
| 2 | Base | 48 km | 229 | |
| 3 | Base | 49 km | 233 | |
| 4 | Base · down | 33 km | 167 | |
| 5 | Base | 50 km | 237 | |
| 6 | Base | 51 km | 241 | |
| 7 | Build | 51 km | 256 | |
| 8 | Build · down | 35 km | 172 | |
| 9 | Build | 52 km | 262 | |
| 10 | Build | 53 km | 265 | |
| 11 | Build | 54 km | 268 | |
| 12 | Peak · down | 37 km | 183 | |
| 13 | Peak | 55 km | 275 | |
| 14 | Race · race | 15 km | 95 |
Your goal is 5% faster than today's fitness. Over 14 weeks that is a realistic ask if the plan gets done. It is not a certainty — nothing here is — but it is the right side of possible.
Common questions
What pace do I need for a sub-40 10k?
4:00 per kilometre, held evenly. Going through halfway more than a few seconds a kilometre quicker than that is the commonest way a goal race is lost, because the cost of going out fast is paid back with interest in the second half.
How many weeks does it take to train for a sub-40 10k?
It depends entirely on how far away you are now. A trained runner improves roughly 0.4% a week in a good block, and one block of training is worth about 12% at most. So from 3% short it is about 8 weeks; from 10% short it is closer to 23; beyond 12% it is more than one season's work.
What should my easy runs be at this fitness?
No faster than 4:58 per kilometre, and slower is fine. Most runners chasing a time goal run their easy days too fast, which leaves them too tired to hit the sessions that actually build speed.
Is this plan right for me?
The numbers on this page are worked out for a runner currently doing 42:00 for the 10 km, on about 47 km a week. Yours will differ. Building your own plan asks for a recent race or time trial and sets every pace from it, adjusted for the altitude you train at.