Running Pace Calculator
Get pace (min/km) and speed from distance and time, plus projected finish times for 5K, 10K, half and full marathon at the same pace. Everything stays in your browser.
Examples (click to try)
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Pace (min/km)
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Speed (km/h)
| Distance (same pace) | Projected time |
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How to Use the Running Pace Calculator
Enter distance (km) and time (minutes), or pick an example. Pace (min/km) and speed (km/h) update instantly, and below them you get projected finish times for 5K, 10K, half and full at the same pace. Enter long times in minutes (e.g. 1h50m = 110).
Examples
- 10km in 50min → 5:00/km · 12.00 km/h
- 5km in 25min → 5:00/km · 12.00 km/h
- Half in 1h50m (110min) → about 5:13/km
- Full in 4h (240min) → about 5:41/km (the sub-4 pace)
- At 5:00/km the table shows 5K=25:00, 10K=50:00, Half=1:45:29, Full=3:30:59 at once
When It Helps
- Checking the pace needed for a 5K, 10K, half marathon or marathon goal.
- Converting a training run into min/km pace and km/h speed.
- Estimating finish times if you hold the same average pace for a longer race.
FAQ
Is my data sent to a server?
No. Everything runs in your browser; nothing is transmitted or stored externally.
What units are used?
Pace is shown in min/km, and speed is also shown in km/h.
What are the half and full marathon distances?
A half is 21.0975 km and a full is 42.195 km. The projected times use these exact distances.
What pace is sub-4 or sub-3?
Sub-4 (under 4 hours for a full marathon) is about 5:41/km; sub-3 is about 4:16/km.