5K Pace Calculator

What Is a 5K Pace Calculator?

A 5K pace calculator converts between your finish time and your running pace for the 5 kilometre distance. Enter a finish time and the tool shows pace per kilometre, pace per mile, and both metric and imperial speed. Enter a pace instead and it estimates your 5K finish time. For other race distances, use the Pace Calculator, the Half Marathon Pace Calculator, or the Marathon Pace Calculator.

How the Calculation Works

A 5K is exactly 5 kilometres, which equals 3.10686 miles because 1 mile is 1.609344 km. Pace is total time divided by distance:

$$\text{Pace} = \frac{\text{Finish Time}}{\text{Distance}}$$

Working the other way, a target pace gives a finish time:

$$\text{Finish Time} = \text{Pace} \times \text{Distance}$$

Speed is distance divided by time, reported in km/h and mph. Converting between pace per km and pace per mile uses the factor 1 mile = 1.609344 km.

Worked Example

A 25:00 5K is 1500 seconds. Pace per kilometre is 1500 / 5 = 300 seconds, or 5:00 per km. Pace per mile is 1500 / 3.10686 = 482.8 seconds, or 8:03 per mile. Speed is 5 / 1500 x 3600 = 12.0 km/h, which is about 7.5 mph. Running that pace for a 10K would take 50:00, a useful benchmark when moving up in distance.