3:45 Marathon Pace
A 3:45 marathon is 8:35 per mile or 5:20 per kilometer. Run it evenly and you reach halfway in 1:52:30.
- Per mile
- 8:35
- Per km
- 5:20
- 5K
- 26:40
- 10K
- 53:19
- Halfway
- 1:52:30
- 20 miles
- 2:51:38
- 30K
- 2:39:58
- Finish
- 3:45:00
3:45 marathon splits by mile
Your elapsed time at every mile marker at an even 8:35 per mile.
| Mile | Elapsed |
|---|---|
| 1 | 8:35 |
| 2 | 17:10 |
| 3 | 25:45 |
| 4 | 34:20 |
| 5 | 42:54 |
| 6 | 51:29 |
| 7 | 1:00:04 |
| 8 | 1:08:39 |
| 9 | 1:17:14 |
| 10 | 1:25:49 |
| 11 | 1:34:24 |
| 12 | 1:42:59 |
| 13 | 1:51:34 |
| Mile | Elapsed |
|---|---|
| 14 | 2:00:09 |
| 15 | 2:08:43 |
| 16 | 2:17:18 |
| 17 | 2:25:53 |
| 18 | 2:34:28 |
| 19 | 2:43:03 |
| 20 | 2:51:38 |
| 21 | 3:00:13 |
| 22 | 3:08:48 |
| 23 | 3:17:23 |
| 24 | 3:25:58 |
| 25 | 3:34:32 |
| 26 | 3:43:07 |
| 26.2 | 3:45:00 |
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3:45 marathon splits by kilometer
Your elapsed time at every 5 km sign at an even 5:20 per kilometer.
| Distance | Elapsed |
|---|---|
| 5 km | 26:40 |
| 10 km | 53:19 |
| 15 km | 1:19:59 |
| 20 km | 1:46:39 |
| Half | 1:52:30 |
| 25 km | 2:13:19 |
| 30 km | 2:39:58 |
| 35 km | 3:06:38 |
| 40 km | 3:33:18 |
| Finish | 3:45:00 |
Even or negative split
1:52:30 and 1:52:30
8:35 per mile from the start line to the finish.
1:53:38 then 1:51:22
8:40 per mile for the first half, 8:30 for the second. You run the second half 2:16 faster and still finish in 3:45.
You can print either plan on a 3:45 pace band: pick the strategy before you print.
Race times that match a 3:45 marathon
By Riegel's formula, a common race-time predictor, a 3:45 marathon is the same effort as these shorter races.
- Half marathon
- 1:47:55
- 10K
- 48:55
- 5K
- 23:28
If your recent race times are slower than these, 3:45 is a stretch goal for now. The formula assumes marathon training: a runner with a fast half marathon and short long runs often finishes slower than it predicts. Use the marathon readiness score to check your mileage and long runs against the goal.
Is 3:45 a Boston qualifying time?
A 3:45:00 meets the Boston Marathon qualifying standard for men 60 and older, and for women and non-binary runners 45 and older (2026 and 2027 standards, age on race day). Meeting the standard does not guarantee entry. For the 2027 race, a qualifier needed to be 5:17 under their standard for a guaranteed place; 1,000 more places went by random draw to qualifiers who missed that cutoff.
Who runs 3:45, and what it takes
Mid-pack open-class marathoners. It meets the Boston qualifying standard for women 45 and older and for men 60 and older.
Weekly mileage matters most at this goal. A runner stuck at 3:50 to 3:55 is usually under 35 miles a week; a runner who breaks 3:45 almost always has a sustained stretch at 45 to 50 miles a week. Long runs should reach 20 miles at least three times in the build. Go through halfway in 1:52:30 and aim for an even second half, or one no more than 30 seconds slower.
3:45 marathon pace FAQ
What pace is a 3:45 marathon?
A 3:45 marathon is 8:35 per mile or 5:20 per kilometer, held for 26.2 miles (42.195 km).
What is the halfway split for a 3:45 marathon?
1:52:30 at an even pace. With a 1% negative split, the first half is 1:53:38 and the second half 1:51:22.
What half marathon time matches a 3:45 marathon?
About 1:47:55, by Riegel's formula. A runner with that half marathon time still needs the long runs and weekly mileage to hold the pace for the full distance.