Pace Calculator
This pace calculator turns a distance and a finish time into your pace per kilometre and per mile and your speed in km/h and mph, then projects race times for the 5K, 10K, half marathon and marathon at that pace.
About this tool
This pace calculator turns a distance and a finish time into your pace per kilometre and per mile and your speed in km/h and mph, then projects race times for the 5K, 10K, half marathon and marathon at that pace.
How to use it
- Enter the distance and choose km or miles, or tap a race preset (5K, 10K, half, marathon).
- Enter your time in hours, minutes and seconds.
- Read your pace per km and per mile and your speed.
- Check the estimated race times at the same pace.
Good to know
- Pace = time ÷ distance; speed = distance ÷ time.
- Pace per mile is about 1.609 times pace per km — a 5:00/km pace equals about 8:03/mile.
- The race projections keep the same pace for every distance; for a fatigue-adjusted prediction use a race time predictor.
- The half marathon is 21.0975 km and the marathon 42.195 km.
Runs entirely in your browser — nothing you enter is uploaded or stored.
Frequently asked questions
How do I calculate my running pace?
Divide your total time by the distance. For example, 50 minutes for 10 km is a pace of 5:00 per kilometre; the calculator does this instantly for any distance.
What is a good 5K pace for beginners?
Many beginners run 5K at roughly 6:30–8:00 per kilometre (about 10:30–13:00 per mile). Any pace you can hold comfortably is a good starting point.
How do I convert min/km to min/mile?
Multiply the pace per km by 1.609. A 6:00/km pace is about 9:39 per mile.
Can I use this for cycling or swimming?
Yes — it works for any distance and time, and speed in km/h or mph is often more useful than pace for cycling.