Your race clock before you type anything: the pace behind every barrier from 1:30 to 2:45, and the time on your watch at every marker on the course. A half marathon is 21.0975 km, or 13.1094 miles.
What pace do I need for my half marathon goal?
Required pace = goal time ÷ 21.0975 km. Mile pace = kilometre pace × 1.609344. Paces are rounded down to the full second, so each one finishes at or under the goal time.
Goal time
Pace per km
Pace per mile
1:30:00
4:15 /km
6:51 /mi
1:45:00
4:58 /km
8:00 /mi
2:00:00
5:41 /km
9:09 /mi
2:15:00
6:23 /km
10:17 /mi
2:30:00
7:06 /km
11:26 /mi
2:45:00
7:49 /km
12:35 /mi
The clock at every marker, at even pace
Each clock = goal time × (marker distance ÷ 21.0975 km), at a perfectly even pace and rounded down, so arriving at this time keeps the barrier safe. Markers sit in on-course order: 10 miles falls between 15 km and 20 km.