Running Pace Calculator

What is the Running Pace Calculator?

A running pace calculator converts a pace (minutes per kilometre) into a finish time for any given distance, useful for planning race splits or predicting a finish time from training runs. It works by simply multiplying your pace in minutes per km by the total distance in km, then converting the resulting decimal minutes into a readable hours:minutes:seconds format. To calculate it manually: total time (in minutes) = pace per km × distance in km — for example, a 5:30 min/km pace over a 21.1km half marathon gives 5.5 × 21.1 = 116.05 minutes, which is 1 hour 56 minutes and 3 seconds. To convert pace per km to pace per mile, multiply by 1.60934.

How it works

Finish time is simply your pace (time per kilometre or mile) multiplied by the total distance — straightforward multiplication once you know your pace, though converting between minutes-and-seconds and decimal minutes for the calculation, and back again for a readable time, is where manual calculation commonly goes wrong.

UK context

UK running events are typically measured in kilometres for shorter distances and use both kilometres and miles depending on the event (a marathon is 26.2 miles / 42.2 km, a half marathon is 13.1 miles / 21.1 km) — being able to quickly convert pace between the two unit systems is useful when comparing training paces from different sources or apps.

Tips

• Pace naturally varies over the course of a long run (many runners slow slightly in the closing stages) — a single average pace figure is a useful planning tool but won't perfectly predict every mile split.
• If you're pacing for a specific target finish time, it's often more useful to work backwards from the target time to find the required pace, rather than forwards from an assumed pace.

A quick note

This page explains the pace-to-time calculation used in the calculator above. Assumes a constant pace throughout the distance.