3:40:00 marathon: what it equals and how to train for it
Running a marathon in 3:40:00 means holding 5:13 per kilometre (8:23 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 | 23:04 | 4:37 | 7:25 |
| 10K | 47:51 | 4:47 | 7:42 |
| 15K | 1:13:41 | 4:55 | 7:54 |
| 10 miles | 1:19:26 | 4:56 | 7:57 |
| Half marathon | 1:46:05 | 5:02 | 8:06 |
| Marathon | 3:40:00 | 5:13 | 8:23 |
Training paces for this fitness
| Run | Per km | Per mile | What it is for |
|---|---|---|---|
| Easy | 5:37 to 6:27 | 9:02 to 10:24 | Most of your running: conversational, builds the base. |
| Marathon | 5:13 | 8:23 | Steady, controlled race-effort running. |
| Threshold | 4:53 | 7:52 | Comfortably hard: tempo runs and cruise intervals. |
| Interval | 4:30 | 7:14 | Hard repeats of 3 to 5 minutes with jog recoveries. |
| Repetition | 4:14 | 6:49 | 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 marathon plan or build your own.
Questions
Is a 3:40:00 marathon a good time?
It depends on your age, experience and goals. A 3:40:00 marathon is an average pace of 5:13 per kilometre (8:23 per mile), which is equal in effort to 5K in 23:04. Use it as a starting point for training, not a verdict.
What should my easy pace be if I run a 3:40:00 marathon?
About 5:37 to 6:27 per kilometre (9:02 to 10:24 per mile). Easy runs should feel conversational; threshold work sits near 4:53 per kilometre.
Faster: 3:30:00 marathon · Slower: 3:50:00 marathon · All race times
These are estimates, not guarantees of a future result. Pace figures round to the second.