40:00 5K: what it equals and how to train for it
Running a 5K in 40:00 means holding 8:00 per kilometre (12:52 per mile). Here is what that fitness is worth at other distances, and the paces to train at.
Equal race times
Predictions from an equal-effort model: the time you could run at each distance with the same fitness and the right training. Longer distances need specific endurance work.
| Distance | Time | Pace per km | Pace per mile |
|---|---|---|---|
| 5K | 40:00 | 8:00 | 12:52 |
| 10K | 1:23:22 | 8:20 | 13:25 |
| 15K | 2:08:15 | 8:33 | 13:46 |
| 10 miles | 2:18:09 | 8:35 | 13:49 |
| Half marathon | 3:03:27 | 8:42 | 14:00 |
| Marathon | 6:12:33 | 8:50 | 14:13 |
Training paces for this fitness
| Run | Per km | Per mile | What it is for |
|---|---|---|---|
| Easy | 9:22 to 10:39 | 15:05 to 17:08 | Most of your running: conversational, builds the base. |
| Marathon | 8:50 | 14:13 | Steady, controlled race-effort running. |
| Threshold | 8:14 | 13:15 | Comfortably hard: tempo runs and cruise intervals. |
| Interval | 7:37 | 12:15 | Hard repeats of 3 to 5 minutes with jog recoveries. |
| Repetition | 7:11 | 11:34 | Short, fast repeats with full recovery, for speed and form. |
How to use these numbers
- Run most of your weekly distance at the easy pace. If you can only speak in short sentences, slow down.
- Keep threshold and interval work to a small share of the week, and add it gradually.
- Hot, hilly or windy? Judge hard sessions by effort, not pace.
- Re-check your numbers after a new race or a hard time trial: fitness changes, and so should your paces.
Turn this into a plan
Runergy Lab builds a week-by-week plan from your own race time, with these paces, the long runs and the easy weeks, and re-plans when life gets in the way. See the faster-5K plan or build your own.
Questions
Is a 40:00 5K a good time?
It depends on your age, experience and goals. A 40:00 5K is an average pace of 8:00 per kilometre (12:52 per mile), which is equal in effort to 10K in 1:23:22. Use it as a starting point for training, not a verdict.
What should my easy pace be if I run a 40:00 5K?
About 9:22 to 10:39 per kilometre (15:05 to 17:08 per mile). Easy runs should feel conversational; threshold work sits near 8:14 per kilometre.
Faster: 39:00 5K ยท All race times
These are estimates, not guarantees of a future result. Pace figures round to the second.