RPRunningPace App

Running calculator

Half Marathon Pace Calculator

Calculate your half marathon finish time, pace, speed, and kilometer or mile splits for 21.0975 km.

Distance
Time
Split unit

Your pace is 4:59 min/km

Pace per km
4:59 min/km
Pace per mile
8:01 min/mile
Finish time
1:45:00
Distance
21.1 km / 13.11 mi
Speed
12.06 km/h
Speed
7.49 mph

Splits

Race split table
SplitCumulative time
1 km4:59
2 km9:57
3 km14:56
4 km19:54
5 km24:53
6 km29:52
7 km34:50
8 km39:49
9 km44:48
10 km49:46
11 km54:45
12 km59:43
13 km1:04:42
14 km1:09:41
15 km1:14:39
16 km1:19:38
17 km1:24:36
18 km1:29:35
19 km1:34:34
20 km1:39:32
21 km1:44:31
21.1 km finish1:45:00

How to calculate half marathon pace

Divide your target half marathon time by 21.0975 kilometers or 13.1 miles.

Example half marathon pace calculation

A 1:45:00 half marathon averages 4:59 min/km, or about 8:01 min/mile.

Half marathon splits

For longer races, checking both kilometer and mile splits makes it easier to stay on target at aid stations and markers.

Frequently asked questions

How long is a half marathon?

A half marathon is 21.0975 kilometers, or about 13.1 miles.

Should I use kilometer or mile splits?

Use the split unit that matches the race markers, then check the equivalent pace for your watch settings.

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