50 kilometres pace calculator
Pace, speed and splits for the 50 kilometres. Enter a target time to see what pace it requires, or a pace to see the finish time it produces.
Enter a finish time
Result
These are estimates from population-level equations, not a measurement of you and not medical advice. Individual results vary widely. Talk to a doctor or a registered dietitian before making significant changes to how you eat or train.
The 50 kilometres
The 50k is the shortest standard ultramarathon distance, and the point at which racing strategy stops resembling road running.
Aerobic endurance, fuelling and gastrointestinal tolerance. At this duration the limiting factor is often whether you can keep eating rather than how fast you can run.
Substantially slower than marathon pace, and often with deliberate walking on climbs. Constant-pace projections from shorter races are least useful at this distance.
Distance: 50 km (50,000 m).
50 kilometres pace chart
Finish time, pace per mile and speed for each pace per kilometre. Everything is computed in metres and seconds and converted once, so no rounding accumulates down the table.
| Pace / km | Finish time | Pace / mile | Speed |
|---|---|---|---|
| 5:00 | 4:10:00 | 8:03 | 12 km/h |
| 5:30 | 4:35:00 | 8:51 | 10.9 km/h |
| 6:00 | 5:00:00 | 9:39 | 10 km/h |
| 6:30 | 5:25:00 | 10:28 | 9.2 km/h |
| 7:00 | 5:50:00 | 11:16 | 8.6 km/h |
| 7:30 | 6:15:00 | 12:04 | 8 km/h |
| 8:00 | 6:40:00 | 12:52 | 7.5 km/h |
| 8:30 | 7:05:00 | 13:41 | 7.1 km/h |
| 9:00 | 7:30:00 | 14:29 | 6.7 km/h |
Split times
7:00 / km · 5:50:00
| Distance | Elapsed |
|---|---|
| 5 km | 35:00 |
| 10 km | 1:10:00 |
| 15 km | 1:45:00 |
| 20 km | 2:20:00 |
| 25 km | 2:55:00 |
| 30 km | 3:30:00 |
| 35 km | 4:05:00 |
| 40 km | 4:40:00 |
| 45 km | 5:15:00 |
| 50 km | 5:50:00 |
Questions
- What pace do I need for a given 50 km time?
- Divide the target time by the distance in kilometres. For the 50 kilometres, 7:00 per kilometre gives 5:50:00. The chart below covers the range most runners race in.
- How should I pace a 50 km?
- Substantially slower than marathon pace, and often with deliberate walking on climbs. Constant-pace projections from shorter races are least useful at this distance.
- What limits performance over the 50 km?
- Aerobic endurance, fuelling and gastrointestinal tolerance. At this duration the limiting factor is often whether you can keep eating rather than how fast you can run.
- Are the projections to other distances reliable?
- No, and the page says so. They assume the same pace holds over a different distance, which it does not — pace falls as distance rises. Riegel's formula applies a fatigue exponent and is the right tool for actual prediction.
- Why does the split table have a partial final segment?
- Because 50 kilometres is 50 km, which is not a whole number of split intervals. The final partial segment is shown rather than dropped, since a table that ends before the finish line is wrong exactly where it matters.