Running Pace Calculator
Find your pace, finish time or distance, in km or miles.
Good to know. Ten seconds faster per kilometre takes about 7 minutes off a marathon.
How it works
In plain words
Pace is time divided by distance. Finish time is pace multiplied by distance. Speed is distance divided by time, in hours.
The formula
pace = time ÷ distance finish time = pace × distance speed = distance ÷ hours 1 mile = 1.609344 km
Worked example
10 km in 55 minutes: 3,300 seconds ÷ 10 = 330 seconds per km, which is a pace of 5:30 /km (8:51 per mile, 10.91 km/h).
Sources
- NIST Special Publication 811, Guide for the Use of the International System of Units, Appendix B Exact conversion factors for US customary units.
- International yard and pound agreement, 1959 1 yard = 0.9144 m and 1 pound = 0.45359237 kg exactly, so 1 inch = 2.54 cm and 1 mile = 1.609344 km.
Sources checked September 29, 2026. 6 automated tests check its answers on every change.
About the running pace calculator
Runners think in pace, minutes per kilometre or per mile, because it is what a watch shows during a run and what training plans prescribe. This calculator turns a distance and time into a pace, or a target pace into a finish time, so you can plan a race or check a training run.
A few benchmarks help. A 5:00 /km pace (about 8:03 per mile) finishes a 10K in 50 minutes and a marathon in about 3 hours 31 minutes. A 6:00 /km pace (9:39 per mile) is a 1-hour 10K and a marathon in about 4 hours 13 minutes.
For races, remember that the official marathon distance is 42.195 km (26.2 miles) and a half marathon is 21.0975 km. GPS watches often measure a little more than the official distance, because runners don’t run the perfectly shortest line, so allow a few seconds per kilometre when planning.
Keeping an even pace is usually the fastest way to run a race. Starting too fast is the most common mistake, and the second half suffers for it. Many runners aim for a slightly faster second half, called a negative split.
Walking works the same way. A brisk walk is roughly 10 to 12 minutes per km.
Questions people ask
How do I calculate my running pace?
Divide your time by the distance. 55 minutes for 10 km is 5.5 minutes per km, which is 5:30 /km.
What pace do I need for a 4-hour marathon?
About 5:41 per km, or 9:09 per mile, held for the whole 42.195 km.
How do I convert pace per km to pace per mile?
Multiply by 1.609344. A 5:00 /km pace is 8:03 per mile.
What is a good 5K time?
It depends on age and experience. Many recreational runners finish between 25 and 35 minutes. The best time is the one you are working towards.