4:20:00 marathon: what it equals and how to train for it
Running a marathon in 4:20:00 means holding 6:10 per kilometre (9:55 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 | 27:24 | 5:29 | 8:49 |
| 10K | 56:55 | 5:42 | 9:10 |
| 15K | 1:27:44 | 5:51 | 9:25 |
| 10 miles | 1:34:34 | 5:53 | 9:27 |
| Half marathon | 2:06:11 | 5:59 | 9:38 |
| Marathon | 4:20:00 | 6:10 | 9:55 |
Training paces for this fitness
| Run | Per km | Per mile | What it is for |
|---|---|---|---|
| Easy | 6:36 to 7:34 | 10:37 to 12:11 | Most of your running: conversational, builds the base. |
| Marathon | 6:10 | 9:55 | Steady, controlled race-effort running. |
| Threshold | 5:45 | 9:15 | Comfortably hard: tempo runs and cruise intervals. |
| Interval | 5:18 | 8:32 | Hard repeats of 3 to 5 minutes with jog recoveries. |
| Repetition | 5:00 | 8:02 | 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 4:20:00 marathon a good time?
It depends on your age, experience and goals. A 4:20:00 marathon is an average pace of 6:10 per kilometre (9:55 per mile), which is equal in effort to 5K in 27:24. Use it as a starting point for training, not a verdict.
What should my easy pace be if I run a 4:20:00 marathon?
About 6:36 to 7:34 per kilometre (10:37 to 12:11 per mile). Easy runs should feel conversational; threshold work sits near 5:45 per kilometre.
Faster: 4:10:00 marathon · Slower: 4:30:00 marathon · All race times
These are estimates, not guarantees of a future result. Pace figures round to the second.