How to Run a Sub 3 Hour
Marathon.

Pace, splits & training plan for a sub 3 hour marathon.

What pace is a 3 hour marathon?

A 3 hour marathon is a pace of 4:16 per kilometre (6:52 per mile), or 14.1 km/h (8.7 mph).

Pace /km

4:16

min/km

Pace /mile

6:52

min/mi

Speed

14.1

km/h

Speed

8.7

mph

3 Hour Marathon splits.

KM Cumulative Time
1 4:16
2 8:32
3 12:48
4 17:04
5 21:20
6 25:36
7 29:52
8 34:08
9 38:24
10 42:40
11 46:55
12 51:11
13 55:27
14 59:43
15 1:03:59
16 1:08:15
17 1:12:31
18 1:16:47
19 1:21:03
20 1:25:19
21 1:29:35
22 1:33:51
23 1:38:07
24 1:42:23
25 1:46:39
26 1:50:55
27 1:55:11
28 1:59:27
29 2:03:43
30 2:07:59
31 2:12:15
32 2:16:31
33 2:20:46
34 2:25:02
35 2:29:18
36 2:33:34
37 2:37:50
38 2:42:06
39 2:46:22
40 2:50:38
41 2:54:54
42 2:59:10
42.195 3:00:00
Mile Cumulative Time
1 6:52
2 13:44
3 20:36
4 27:28
5 34:20
6 41:12
7 48:03
8 54:55
9 1:01:47
10 1:08:39
11 1:15:31
12 1:22:23
13 1:29:15
14 1:36:07
15 1:42:59
16 1:49:51
17 1:56:43
18 2:03:35
19 2:10:26
20 2:17:18
21 2:24:10
22 2:31:02
23 2:37:54
24 2:44:46
25 2:51:38
26 2:58:30
26.22 3:00:00

Get the 16-week plan on Garmin or Coros.

Race, tempo and interval paces from the matching 3 hour marathon training plan, plus two real weeks already on it.

Race

4:16

min/km

Tempo

3:48–4:18

min/km

Intervals

3:20–3:42

min/km

Week 4 45 km 5 runs
Monday

Rest

Tuesday

Intervals

3:48 - 4:12 / km

Wednesday

Easy 12km

5:20 - 5:50 / km

Thursday

Tempo

4:10 - 4:40 / km

Friday

Rest

Saturday

Recovery 6km

5:20 - 5:50 / km

Sunday

10km Race

4:18 / km

Week 12 79 km 35 km long run 5 runs
Monday

Rest

Tuesday

Intervals

3:48 - 4:12 / km

Wednesday

Easy 14km

5:20 - 5:50 / km

Thursday

Progression

4:10 - 4:40 / km

Friday

Rest

Saturday

Recovery 6km

5:20 - 5:50 / km

Sunday

Long Run 35km

5:40 - 6:20 / km

Start the 3 hour marathon training plan

What does this pace feel like?

Sub-3 is the marathon's most coveted amateur milestone: 4:16 per kilometre held for 42.2 km. The pace itself is one a well-trained runner can cruise at for an hour — the examination is the final 10 km, where glycogen runs low and 4:16 starts to feel like interval pace. Breaking three hours is less about raw speed than about how deep your aerobic base and fuelling strategy let you hold it.

Adjust your target.

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Related.

Training plans

Marathon Running Plans

Need more time?

Sub 3:15 Marathon Pace Guide
Back to Pace Calculator

FAQs.

How hard is a sub-3 hour marathon?

It's the benchmark most committed amateur marathoners aspire to — typically only a few percent of finishers at a big-city marathon break three hours. It demands 4:16/km (6:52/mi) for the full distance.

What half marathon time predicts a sub-3 marathon?

A half of 1:24–1:26 suggests sub-3 fitness, provided your long-run and weekly volume back it up. A recent 10K under 39:00 is another good indicator.

What weekly mileage do I need to break 3 hours?

Most sub-3 runners log 75–95 km per week during the build. Some succeed on less, but the final 10 km of the race usually exposes a thin base.