Running Pace Calculator
Enter distance and time — see your pace in min/km, your speed in km/h, and what the same pace gives you for 5K, 10K, half marathon and marathon.
How to use the running pace calculator
- Enter the distance you ran (or plan to run).
- Enter the time it took (or your goal time).
- The calculator shows your pace, and what the same pace gives you on other standard distances.
How the pace is calculated
Speed (km/h) = 3600 ÷ Pace (seconds per km)
Split times for other distances are calculated by assuming you hold exactly the same pace the whole way — in practice most runners will have a slightly different average pace over a longer distance than a shorter one, so the numbers are a starting point for planning, not a guarantee.
Frequently asked questions
Why doesn't the marathon time end up much longer than the 10K time × 4.2?
Here it doesn't — this calculator computes the split times at exactly the same pace, so proportional to the distance. In practice, very few runners can hold exact 10K pace through a whole marathon, so a real marathon time is usually somewhat longer than what this calculator shows.
Which distances does the calculator use?
5 km, 10 km, half marathon (21.0975 km) and marathon (42.195 km) — the four most common standard distances in running races.
Can I use the calculator for other activities besides running?
Yes, the formula (distance ÷ time) works for walking, cycling or other activities where you want to calculate pace or speed — the split table, however, is specific to running distances.