Running pace calculator

Work out your running pace from a distance and a time, your finish time from a pace, or how far you will go at a pace. Results show per kilometre, per mile and as speed.

How the calculator works

Pace is time divided by distance. A 50:00 10K is 3,000 seconds over 10 kilometres, so 300 seconds or 5:00 per kilometre. The calculator rearranges that one relationship: time is pace multiplied by distance, and distance is time divided by pace.

One mile is 1.609344 kilometres, so a pace per mile is the pace per kilometre multiplied by 1.609344. 5:00 per kilometre is 8:03 per mile. Speed is the same number turned around: 5:00 per kilometre is 12 kilometres per hour, or about 7.5 miles per hour.

Times and paces are rounded to the nearest second only when they are shown. Multiplying a rounded pace by a distance can therefore differ by a second or two from the finish time.

Why the same pace is not the same effort

The table under your result shows the time each standard distance would take at your pace. That is arithmetic, not a prediction. A pace you can hold for a 10K is much harder to hold for a half marathon or a marathon, and the further the distance, the wider the gap.

To estimate what a result means at another distance, use the race time calculator, which adjusts for that slowing. To pace a race you have already chosen a goal for, the race split calculator lays out each kilometre or mile.

What the calculator does not know

It uses only the numbers you enter. It does not know the course, the weather, how you feel or how the run fits your week. GPS watches also measure distance with some error, especially in cities and under trees, so a watch pace and a calculated pace can differ.

From a pace to a plan

A pace answers how fast. The useful question is usually how fast today: easy runs, long runs and hard sessions each have their own range. The training pace calculator turns a recent race into those ranges. We make coach steve, an AI running coach you can text, for the conversation that comes after the number.

Common questions

Can I enter a distance that is not a standard race?

Yes. Choose another distance and type it in kilometres or miles, with a dot or a comma for decimals.

Why does my watch show a different pace?

Watches measure distance from GPS, which drifts, and many show a rolling pace over the last few seconds. The calculator uses the exact distance and time you enter.

Where are my numbers saved?

Nowhere. The calculator keeps them in the page while it is open. If you choose the text button, the pace is included in a message you can edit before sending.