Running Pace Calculator

Calculate your running pace from distance and time

Enter a completed or target distance and the total time to calculate average pace per kilometre and per mile. The calculator also converts that effort into average speed, projects finish times for common race distances at the same pace and creates an even-split table.

Use a common distance such as 1 kilometre, 1 mile, 5K, 10K, half marathon or marathon, or enter a custom distance. Results update from the distance and time you provide.

What the pace calculator shows

• Average pace per kilometre
• Average pace per mile
• Average speed in kilometres per hour
• Average speed in miles per hour
• Projected finish times for common running distances
• Even split times in kilometres or miles

How to use the calculator

1. Choose a common distance or enter a custom distance.
2. Enter the total hours, minutes and seconds.
3. Review pace and speed in both metric and imperial units.
4. Use the projections to compare what the same average pace would produce over another distance.
5. Open the split table when you want checkpoint targets for an evenly paced run.

You can use a recent result to understand the pace you actually maintained, or enter a target time to see the pace required.

Running pace formulas

Average pace is total time divided by distance.

Pace per kilometre = total time ÷ distance in kilometres

Pace per mile = total time ÷ distance in miles

Average speed reverses the same relationship:

Speed = distance ÷ time

The calculator converts one mile to 1.609344 kilometres. Displayed pace is rounded to the nearest second, while projections use the underlying value before display rounding.

Finish-time projections

A finish-time projection multiplies the calculated average pace by another distance. For example, running 5 kilometres in 25 minutes gives an average pace of 5:00 per kilometre. Holding exactly that pace for 10 kilometres would produce a projected finish time of 50:00.

This is a constant-pace conversion, not a race-equivalence prediction. It does not assume that endurance, fatigue, terrain or weather change with distance. A marathon projection based on a short run can therefore be mathematically correct while still being unrealistic for the runner.

Even splits

Even splits divide the total target time across equal kilometres or miles. They can help with race planning because they turn one finish-time goal into practical checkpoints.

Real races are rarely perfectly even. Hills, wind, aid stations, congestion and course measurement can all change an individual split. Treat the table as a pacing reference rather than a requirement to hit every checkpoint exactly.

Pace versus speed

Pace describes the time needed to cover one unit of distance. A lower pace means faster running: 4:30 per kilometre is faster than 5:00 per kilometre.

Speed describes distance covered per hour. A higher number means faster running. Pace is usually more useful during a run, while speed is useful when comparing running with cycling, treadmill settings or other movement.

Example: a 50-minute 10K

A 10-kilometre time of 50:00 produces:

• Pace per kilometre: 5:00
• Pace per mile: approximately 8:03
• Average speed: 12.00 km/h
• Average speed: approximately 7.46 mph
• Projected 5K time at the same pace: 25:00

The projection does not claim that a runner who completes this 10K will necessarily hold the same pace for a half marathon or marathon.

Planning limits

The result is based only on distance and elapsed time. It does not adjust for elevation, surface, temperature, wind, stops, GPS error, current fitness or recovery.

Do not use constant-pace projections as medical advice or as a guarantee of race performance. Build training and race plans around your experience, health and the conditions of the event.

Frequently asked questions

What is a good running pace?

There is no universal good pace. A useful pace depends on the distance, purpose of the session, terrain, weather, experience and current fitness. Compare a result with your own recent efforts rather than a single general benchmark.

Can I calculate the pace needed for a target time?

Yes. Enter the target distance and finish time. The calculator returns the average pace per kilometre and per mile required to achieve that time.

Why does the projected marathon time look optimistic?

The projection assumes the same average pace at every distance. It does not model the additional fatigue of a longer race. Use it as a conversion, not as a prediction of current marathon ability.

Are treadmill pace and outdoor pace identical?

The mathematical conversion is identical, but the physical effort may differ because of belt mechanics, wind resistance, incline, temperature and running surface.

Should I use kilometre or mile splits?

Use the unit shown on the course or the unit you normally follow during training. The calculator provides both pace units, so you can compare them without re-entering the run.