Pace Calculator
Convert between running pace, speed, distance and finish time, per kilometre or per mile.
About the Pace Calculator
Choose what you want to find (pace, finish time or distance) and enter the other two. The result also gives your pace per km and per mile and your speed in km/h and mph, so you can switch between a watch, a treadmill and a race plan.
Pace is time per unit of distance, the way runners usually think about speed. Faster running means a smaller pace number: 5:00 per km is quicker than 6:00 per km.
The formula
Pace = time ÷ distance; speed = distance ÷ time
- 1 mile
- 1.609344 km
- Half marathon
- 21.0975 km
- Marathon
- 42.195 km
How to read your result
- To turn pace into treadmill speed, divide 60 by the minutes per km: 5:00 per km = 60 ÷ 5 = 12 km/h.
Worked example
10 km in 50:00, and a half marathon at 5:30 per km
- Pace = 50:00 ÷ 10 = 5:00 per km (8:03 per mile), 12 km/h
- Half marathon: 5:30 × 21.0975 = 1:56:02
Things to keep in mind
- Assumes an even pace; hills, wind, heat and crowded starts all slow real races.
- GPS watches usually measure races slightly long, so your watch pace can read a little faster than your official pace.
Questions people ask
How do I enter a time?
As h:mm:ss or mm:ss, e.g. 1:45:30 or 25:00. A single number means minutes.
Is pace the same on a treadmill?
Roughly; setting a 1% incline better matches outdoor effort.
How do I convert min/km to min/mile?
Multiply by 1.609: 5:00 per km is 8:03 per mile.