Your likely time over 5K, 10K, half and marathon
A recent race time: your likely times over the other distances.
Your likely time for the marathon
3:50:01 – 3:54:16
- Riegel
- 3:50:01
- Cameron
- 3:54:16
- Pace
- 5:30/km
Based on your 10K race.
Every distance
Two models, two opinions: the gap between them is the uncertainty.
| Distance | Riegel | Cameron | Pace |
|---|---|---|---|
| 5K | 23:59 | 24:00 | 4:48/km |
| 10K | 50:00 | 50:00 | 5:00/km |
| Half marathon | 1:50:19 | 1:50:14 | 5:14/km |
| Marathon | 3:50:01 | 3:54:16 | 5:30/km |
- Riegel formula (1981): target time = known time × (target distance ÷ known distance) to the power of 1.06.
- Cameron’s formula (1993), built from world records from 400 m to 50 miles: it often predicts a slower marathon. The gap between the two is the uncertainty.
Frequently asked questions
It is the shakiest: the formula assumes you trained for the distance. Without long runs, your marathon will be slower.
A recent race, run all out, over a distance close to your target.
No: elevation and terrain change everything. The formula holds for road and track.
- Running pace calculatorPace, speed and splits
- Maximal aerobic speed calculatorYour maximal aerobic speed and training paces
- Heart rate zonesYour five heart rate zones
- Max heart rateYour maximum heart rate
- Running training planYour training plan, week by week
- Beep testYour VO2max from the beep test
- Fitness ageYour fitness age
A coach to take you further
A programme built for you and adjusted every week, by a coach near you or online.
Free directory, no sign-up.