Sub 1:25 half marathon pace
To run a half marathon under 1:25:00 you need to average 4:01 per kilometre, or 6:29 per mile. Here are the splits, a pace band, the paces to train at and the fitness you need before race day.
Pace band
Even-pace elapsed times. Copy them to your wrist, or get a printable band in the free Race Pace Plan.
Splits
Even pace versus a 1 % negative split. Both finish exactly on 1:25:00; aim to cross the line a little inside it.
| Point | Even pace | 1 % negative |
|---|---|---|
| 5 km | 20:09 | 20:15 |
| 10 km | 40:17 | 40:29 |
| 15 km | 1:00:26 | 1:00:33 |
| 20 km | 1:20:35 | 1:20:36 |
| Finish | 1:25:00 | 1:25:00 |
Race times that match this goal
Equivalent performances from Riegel's formula. If you can run these, sub 1:25 is realistic with the right training.
Training paces for sub 1:25
| Run type | Pace /km | Zone | Typical session |
|---|---|---|---|
| Recovery | 5:20–5:59 | Zone 1 | Between hard days, 20–40 min |
| Easy and long runs | 4:49–5:20 | Zone 1–2 | Most of your weekly volume |
| Marathon pace | 4:09–4:15 | Zone 2–3 | Long-run segments of 8–20 km |
| Threshold | 3:53–4:02 | Zone 3–4 | 3 × 10 min or 20–30 min steady |
| Interval (VO2max) | 3:35–3:42 | Zone 4–5 | 5 × 1000 m, 3 min jog |
| Repetition | 3:25–3:29 | Zone 5 | 8 × 200–400 m, full recovery |
What it takes
Most runners who break 1:25 in the half marathon build to about 50–70 km a week over 10–12 weeks, with long runs of 16–22 km. The key sessions are threshold runs and half-marathon-pace segments in the second half of long runs.
A 10K around 38:31 four to six weeks before the race is a good checkpoint. If you are slower than 39:41, aim for sub 1:30 instead and adjust after your next test.
Weekly volumes are typical ranges, not requirements. Build up gradually and adjust to your own history.
Common questions
How fast is sub 1:25 half marathon pace per mile?
6:29 per mile, or 4:01 per kilometre.
What 10K time do I need for a sub 1:25 half marathon?
Around 38:31 on Riegel's formula, assuming training that is specific to the half marathon.
Should I run even splits?
Yes, or a very slight negative split. Starting faster than goal pace costs far more time late in the race than it gains early. Read how to pace a marathon for a simple plan.
Get the sub 1:25 half marathon Race Pace Plan. Tell us your race and goal time. You get one PDF with:
- Goal pace and splits for your race
- Training paces for all five zones
- A printable pace band