Pace Calculator.

Work out your running pace, finish time or distance from the other two, per kilometre or per mile, with the splits to run it evenly.

Work out

Distance (km)

Finish time (h:mm:ss)

Pace (min per km)

Pace

4:58.6 /km

Marathon in 3:30:00

Per km

4:58.6

Per mile

8:00.6

Speed

12.06 km/h

7.49 mph

Finish

3:30:00

Even-pace splits, per km

km	Elapsed
1	4:59
2	9:57
3	14:56
4	19:54
5	24:53
6	29:52
7	34:50
8	39:49
9	44:48
10	49:46
11	54:45
12	59:43
13	1:04:42
14	1:09:41
15	1:14:39
16	1:19:38
17	1:24:36
18	1:29:35
19	1:34:34
20	1:39:32
21	1:44:31
22	1:49:29
23	1:54:28
24	1:59:27
25	2:04:25
26	2:09:24
27	2:14:23
28	2:19:21
29	2:24:20
30	2:29:18
31	2:34:17
32	2:39:16
33	2:44:14
34	2:49:13
35	2:54:11
36	2:59:10
37	3:04:09
38	3:09:07
39	3:14:06
40	3:19:05
41	3:24:03
42	3:29:02
Finish (42.195)	3:30:00

How to calculate running pace

Choose what to work out: pace, finish time or distance.
Enter the other two, or pick a race distance from the presets.
Switch between kilometres and miles; the values you typed are converted, not cleared.
Read the pace, speed and finish time, and the even-pace splits for every km or mile.

About the pace calculator

Pace is time per distance, the way runners count: minutes and seconds per kilometre or per mile. It is the inverse of speed, so 5:00 per km is 12 km/h. Give the calculator any two of distance, finish time and pace and it works out the third, in both units at once.

The arithmetic. Pace is the finish time divided by the distance. A 3:30:00 marathon is 12,600 seconds over 42.195 km, which is 298.6 seconds, or 4:58.6 per km. Per mile, multiply by 1.609344: 8:00.6. Finish time is pace × distance, and distance is time ÷ pace.

Race distances. The presets use the official road distances: 5 km, 10 km, the half marathon (21.0975 km, 13.11 miles) and the marathon (42.195 km, 26.22 miles). Those extra 195 metres matter: at 5:00 per km they are another minute on the clock, and a GPS watch usually reads a little long over a real course, so a target pace needs some margin.

Splits. The table shows where an even pace puts you at every kilometre or mile, which you can write on a wristband. Most runners run their best races close to even or slightly faster in the second half (a negative split); going out faster than goal pace usually costs more time late in the race than it saved early.

Frequently Asked Questions

How do I calculate my running pace?

Divide your time by the distance. A 3:30:00 marathon is 12,600 seconds over 42.195 km: 298.6 seconds, or 4:58.6 per km (8:00.6 per mile).

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

Faster than 5:41.3 per km, or 9:09.2 per mile, held for all 42.195 km. The same pace gives a sub-2-hour half marathon, since the half is exactly half the distance.

How do I convert a pace per km to a pace per mile?

Multiply by 1.609344, the number of kilometres in a mile. So 5:00 per km is 8:02.8 per mile, and 8:00 per mile is 4:58.3 per km.

How long is a marathon and a half marathon?

A marathon is 42.195 km (26.22 miles), a distance fixed in 1921, and a half marathon is exactly half: 21.0975 km (13.11 miles).

What is the difference between pace and speed?

Pace is time per distance, and speed is distance per time, so each is the other upside down. 5:00 per km is 12 km/h, or 7.46 mph. Runners use pace because it maps straight onto a watch and onto splits.