Running Pace Calculator

Written byOleh Soloninupdated 25 September 2026

Calculate

Distance, km

Hours

Minutes (or pace min)

Seconds (or pace sec)

Result

Pace, min/km5:00
Pace, min/mile8:03
Speed, km/h12
Total minutes50

This result is informational only and is not professional advice.

Pace and speed from time and distance, or a finish time from pace

Convert a run into pace per kilometre and mile, or predict a finish time from a target pace over any distance.

Pace is minutes per kilometre and speed is kilometres per hour, and runners think in the first while treadmills display the second. Converting in your head mid-run is not realistic.

The calculator works both ways: enter a time to get the pace you ran, or enter a target pace to see the finish time it produces over your distance.

How to use

Choose a mode: find your pace from a finish time, or a finish time from a target pace.
Enter the distance in kilometres: 5, 10, 21.0975 for a half marathon, 42.195 for a marathon.
Enter the finish time in hours, minutes and seconds — or the target pace in minutes and seconds per kilometre.
The result gives pace per kilometre and per mile, speed in km/h and the finish time.

Pace for 10 km

Pace is time per kilometre and speed is kilometres per hour; one comes from the other by dividing 60 by the pace in minutes. A one-hour 10K is 6:00 per kilometre and 10 km/h; a 40-minute one is 4:00 and 15 km/h.

Every row comes from the calculator on this page.
10K time	Pace, min/km	Pace, min/mile	Speed, km/h
40:00	4:00	6:26	15
45:00	4:30	7:15	13.33
50:00	5:00	8:03	12
55:00	5:30	8:51	10.91
1:00:00	6:00	9:39	10
1:10:00	7:00	11:16	8.57

Pace for the marathon and half marathon

A four-hour marathon needs 5:41 per kilometre over all 42.195 km; a three-hour one, 4:16. A two-hour half marathon runs at the same pace as a four-hour marathon: half the distance, half the time.

An even pace over the whole distance. Every row comes from the calculator on this page.
Target	Pace, min/km	Speed, km/h
Marathon 3:00	4:16	14.07
Marathon 3:30	4:59	12.06
Marathon 4:00	5:41	10.55
Marathon 4:30	6:24	9.38
Marathon 5:00	7:07	8.44
Half marathon 1:30	4:16	14.07
Half marathon 1:45	4:59	12.06
Half marathon 2:00	5:41	10.55

What this calculator shows

Pace per kilometre and per mile
Speed in km/h for treadmill settings
Predicted finish time from a target pace

What to keep in mind

Assumes an even pace throughout, which real races rarely are.
Hills, heat and fatigue all cost time that a flat conversion cannot predict.

FAQs

What pace do I need for a sub-4-hour marathon?

5:41 per kilometre, or 9:09 per mile, held for the full 42.195 km — 10.55 km/h. Three and a half hours needs 4:59, three hours 4:16.

What pace runs a 50-minute 10K?

5:00 per kilometre, or 12 km/h. A 45-minute 10K needs 4:30, a one-hour 10K 6:00.

How do I convert pace to treadmill speed?

Divide 60 by your pace in minutes. A 5:00 min/km pace is 60 ÷ 5 = 12 km/h; a 5:30 pace is 10.91 km/h.

How do I convert pace per kilometre to pace per mile?

Multiply by 1.609, the kilometres in a mile. 5:00 per kilometre is 8:03 per mile; 6:00 is 9:39.

What marathon time does a 50-minute 10K predict?

Straight pace conversion gives 3:31, but Riegel's formula, which allows for slowing over longer distances, predicts about 3:50. The marathon time predictor on this site does that calculation.

Why is my race time worse than the calculation?

The calculation assumes an even pace, while hills, heat and fatigue over a long distance cost time that simple conversion cannot see.

Worked example

A 50-minute 10K

Input: 10 km in 50:00

Output: 5:00 min/km · 12 km/h · 8:03 min/mile

Note: Holding exactly that pace for a marathon would give 3:31, but Riegel's formula predicts about 3:50 from a 50-minute 10K: pace drops over the longer distance.

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Result

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