# Calculate time, distance, pace and speed

Enter at least one value to calculate equivalent units. Enter two or three to calculate all values.
 Time: [hh:mm:ss] Distance: miles km marathon half marathon Pace: min/mile [mm:ss] mph min/km [mm:ss] km/h

Time, distance, pace and speed are central concepts in sports such as running and cycling where the goal is to travel from start to finish as fast as possible. They are often used to judge competition performances, and to plan and analyse in training.

Depending on where you're from, distance is typically measured in miles or kilometres (abbreviated km). One mile is exactly 1.609344 km.

Both pace and speed gives information about how fast something is moving and can be calculated if the distance and time is known. Pace is time per unit of distance and is often measured in min/mile (minutes per mile) or min/km (minutes per kilometre). Speed is travelled distance per unit of time and is often measured in mph (miles per hour) or km/h (kilometres per hour). What is used often depends on the context and the particular sport. Speed in normally used in cycling and motorsports. Pace is more often used by runners because it's easier to calculate during a run with a traditional clock that only meassures time. Treadmills, on the other hand, often use speed.

The tool at the top of the page can be used to calculate time, distance and pace/speed, but it can also be used to convert between units. If only the distance is known the tool can be used to convert between miles and kilometres. In the same way it's also possible to convert between the four units for pace and speed.

Time is entered in the format [hh:mm:ss], i.e. the number of hours, minutes and seconds separated by colons (:). Hours and seconds can be left out. For example, 12:13 means 12 minutes and 13 seconds and just 54 means 54 minutes. Each part can consist of any number of digits. 1:120:5 is the same as 03:00:05. The numbers can even contain a decimal mark so instead of 2:30 it's possible to write 2.5 because 2 minutes and 30 seconds is the same as two and a half minute. Pace works the same way as time except that there are no hours.