Running pace calculator
The math runs in this tab. Nothing is uploaded.
Result
At this pace
Time as h:mm:ss or mm:ss, pace as m:ss. Race predictions assume an even pace.
How to use this tool
Turn distance and time into pace, or pace into finish time, with race predictions. Nothing is uploaded.
Open Pace calculator
Pace is selected with 10 km in 55:00. The pace per km and per mile, speed, and race times sit on the right.
Choose what to calculate
Pick Pace, Time or Distance and fill the other two. Switch km to miles when needed.
Read the predictions
5K, 10K, half and marathon times at the same pace update as you type. Copy puts the result on the clipboard.
FAQ
How do I use the pace calculator?
Pick what to solve for, choose km or miles, and fill in the other two values. Time accepts h:mm:ss or mm:ss; pace accepts m:ss.
Is anything uploaded?
No. The math runs in this tab.
What are the race predictions?
Finish times for 5K, 10K, half marathon (21.0975 km) and marathon (42.195 km) if you held the same pace the whole way. Real race times slow down over longer distances.
How do I convert pace per km to pace per mile?
Multiply by 1.609. The result shows both: 5:00 /km is about 8:03 /mi.
Does it handle treadmill speed?
Yes. Speed in km/h or mph is shown next to the pace, so 12 km/h equals a 5:00 /km pace.