Running Pace Calculator

The Running Pace Calculator solves the classic runner's triangle: enter any two of distance, time and pace and it works out the third. Distances can be typed in kilometers or miles, or set with one click to a 5K, 10K, half marathon (21.0975 km) or marathon (42.195 km). Times are entered as hours, minutes and seconds, such as 1:45:00, and pace as minutes and seconds per kilometer or per mile.

Every result shows the pace in both min/km and min/mi, the speed in km/h and mph, and the distance in the other unit. A second panel lists the finish times for 5K, 10K, half marathon and marathon at the same pace, and a split table shows the time for every kilometer or mile and the running total, which you can copy as a pace band for race day. When you switch between solving for pace, time or distance, the last result is carried over so you can compare scenarios quickly.

Runners use it to set a target pace for a race, to check what finish time a training pace leads to, to convert a treadmill speed into a pace, and to plan even splits. For training intensity, pair it with the Heart Rate Zone Calculator; for drinking on long runs, see the Water Intake Calculator.