Marathon Split Calculator

Goal time to per-km split timesRuns locally · nothing uploaded

Race distanceGoal finish timeh:mm:ss, e.g. 1:59:59Split every

Pacing strategy

Average pace

5:41 /km

Split	Distance	Pace /km	Split time	Elapsed
1	1 km	5:41	5:41	0:05:41
2	2 km	5:41	5:41	0:11:22
3	3 km	5:41	5:41	0:17:04
4	4 km	5:41	5:41	0:22:45
5	5 km	5:41	5:41	0:28:26
6	6 km	5:41	5:41	0:34:07
7	7 km	5:41	5:41	0:39:49
8	8 km	5:41	5:41	0:45:30
9	9 km	5:41	5:41	0:51:11
10	10 km	5:41	5:41	0:56:52
11	11 km	5:41	5:41	1:02:33
12	12 km	5:41	5:41	1:08:15
13	13 km	5:41	5:41	1:13:56
14	14 km	5:41	5:41	1:19:37
15	15 km	5:41	5:41	1:25:18
16	16 km	5:41	5:41	1:31:00
17	17 km	5:41	5:41	1:36:41
18	18 km	5:41	5:41	1:42:22
19	19 km	5:41	5:41	1:48:03
20	20 km	5:41	5:41	1:53:45
21	21 km	5:41	5:41	1:59:26
22	21.098 km	5:41	0:33	1:59:59

Also works as:pace chartmarathon pace bandnegative split calculatorsub 4 marathon splitshalf marathon splits

How it works

Average pace = goal time ÷ distance

Negative split: first half = average + d/2, second half = average − d/2

d is the per-km difference between halves; total time stays the same.

Given: Half marathon (21.0975 km) in 1:59:59, negative split of 10 s/km

Result: Pass 10 km at about 0:57:42 and finish on time.

1Pick the race distance and enter your goal finish time.
2Choose the split interval and a pacing strategy; for a negative split, enter the pace difference between halves.
3Read the split pace and elapsed time at each marker, and print it as a pace band.

What pace is a sub-4 marathon?

About 5:41 per km (9:09 per mile). Aim a little faster to leave room for aid stations and weaving.

What is a negative split?

Running the second half faster than the first. Starting conservatively lowers the risk of hitting the wall.

Why does my watch show a longer distance?

Courses are measured on the shortest line; real running and GPS error usually add 0.3–1%. Check elapsed time at the official km markers instead.