About the Pace Calculator
Pace is the time one kilometre or mile takes you, and it is the number most training plans are written in. Enter a distance and your finishing time and this calculator gives pace per km and per mile, speed in km/h and mph, and what the same pace would produce over a mile, 5K, 10K, half marathon and marathon.
How to use the Pace Calculator
- Enter the distance and choose kilometres or miles.
- Enter your time in hours, minutes and seconds.
- Read your pace per km and per mile, and your speed.
- Use the finish-time table to set a goal pace for longer races.
The formula behind it
Pace = total time ÷ distance. Speed = 3600 ÷ pace in seconds. One mile = 1.609344 km.
Frequently asked questions
What pace is a 25-minute 5K?
25 minutes over 5 km is 5:00 per km, or about 8:03 per mile.
What pace do I need for a 4-hour marathon?
Four hours over 42.195 km is about 5:41 per km, or 9:09 per mile.
Will I really hold the same pace in a marathon?
Rarely. Most people slow over longer distances, so a 5K pace multiplied up is an upper bound, not a prediction. Treat the table as the pace you would need, not a forecast.
Why are min/km and min/mile so different?
A mile is about 61% longer than a kilometre, so each mile takes about 1.61 times as long at the same effort.
How is speed related to pace?
They are inverses. A 6:00 per km pace is 10 km/h; a faster pace means a smaller pace number but a higher speed.