Sub-1:20 Half Marathon Pace

To break 1:20:00 you need 3:48 per kilometer or 6:06 per mile (15.8 km/h, 9.8 mph). Set your own target below, then take the splits and a pace band to the start line.

Half marathon

12000

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Pace: 3:48 /km
Status: Sub-1:22:30 · 2:30 to spare

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Flick: Spin the tape. It lands on round times and snaps to nearby goals.
Drag down: Keep holding and pull away from the tape for ½, ¼ or fine speed.
Roll: Tap a digit on the bib, then drag it up or down.
Keys: ← → move five seconds, Shift moves a minute.

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Your pace band

Clock time at every marker. Print it, cut it, tape it to your wrist.

The same pace from start to finish.

Half marathon1:20:00
5K18:58
10K37:55
15K56:53
20K1:15:50
Finish1:20:00

If you can run 1:20:00

Equivalent race times from the Riegel formula. Longer-race predictions assume your endurance training matches.

5K17:23

10K36:15

Half marathon1:20:00

Marathon2:46:48

Workout paces

Interval targets based on your equivalent 5K effort.

Rep	Target
Mile	5:32–5:44
1000m	3:18–3:29
800m	2:35–2:44
400m	1:13–1:18
200m	0:32–0:35

Sub-1:20 half marathon splits

Even-pace clock times for a 1:20:00 half marathon. Holding 3:47 per kilometer finishes in 1:19:49; holding 6:06 per mile finishes in 1:19:58.

Kilometer splits at 3:48/km
5 km	18:58
10 km	37:55
15 km	56:53
20 km	1:15:50
Finish	1:20:00

Mile splits at 6:06/mi
Mile 1	6:06
Mile 2	12:12
Mile 3	18:18
Mile 4	24:25
Mile 5	30:31
Mile 6	36:37
Mile 7	42:43
Mile 8	48:49
Mile 9	54:55
Mile 10	1:01:02
Mile 11	1:07:08
Mile 12	1:13:14
Mile 13	1:19:20
Finish (13.1 mi)	1:20:00

Race times that go with a sub-1:20 half marathon

Riegel-formula equivalents for a 1:20:00 half marathon. If your weekly mileage is modest, aim for about 35:43 in the 10K rather than 36:15 before committing to this goal.

5K17:23

10K36:15

marathon2:46:48

Frequently asked questions

What pace is a 1:20 half marathon?

A 1:20:00 half marathon averages 3:48 per kilometer or 6:06 per mile. Holding 3:47 per kilometer finishes in 1:19:49, and 6:06 per mile finishes in 1:19:58.

What 10K time do I need for a sub-1:20 half marathon?

The Riegel formula lines up a 1:20:00 half marathon with about 36:15 for the 10K. A more conservative estimate for runners without high weekly mileage is about 35:43.

What is the halfway split for a sub-1:20 half marathon?

At even pace the halfway split is 40:00. Many runners aim to pass halfway a few seconds slower and finish with a small negative split.