Marathon Split Pacing Calculator

Pick your race, enter your goal time, and get a mile-by-mile pacing plan built from that course's elevation — not a flat-course guess.

Race

Even pace pacing comes pre-selected for Boston Marathon — it suits this course. Read the course guide

Goal finish time

min

sec

Pacing strategy

Mile	Pace	Elapsed
1	9:09/mi	9:09
2	9:09/mi	18:18
3	9:09/mi	27:28
4	9:09/mi	36:37
5	9:09/mi	45:46
6	9:09/mi	54:55
7	9:09/mi	1:04:05
8	9:09/mi	1:13:14
9	9:09/mi	1:22:23
10	9:09/mi	1:31:32
11	9:09/mi	1:40:41
12	9:09/mi	1:49:51
13	9:09/mi	1:59:00
14	9:09/mi	2:08:09
15	9:09/mi	2:17:18
16	9:09/mi	2:26:28
17	9:09/mi	2:35:37
18	9:09/mi	2:44:46
19	9:09/mi	2:53:55
20	9:09/mi	3:03:05
21	9:09/mi	3:12:14
22	9:09/mi	3:21:23
23	9:09/mi	3:30:32
24	9:09/mi	3:39:41
25	9:09/mi	3:48:51
26	9:09/mi	3:58:00
26.22	9:09/mi	4:00:00

Why grade-adjusted pacing matters

Even pacing works on a flat course. On a hilly one it falls apart: holding the same clock split uphill costs far more than it saves, and the effort spikes catch up with you late. Grade-adjusted pacing flips it around — it holds your effort steady and lets the clock splits move with the terrain, so the hills cost you fitness instead of time.

The grade column shows each mile's average gradient from the course's elevation data. These profiles capture each course's established character rather than a surveyed GPS trace, so treat the plan as a pacing framework and run the actual hills by feel on the day. Our methodology explains how the course data behind these splits is built.

Ready to train toward it?

Build a free, personalized plan that uses these paces and progresses you safely to race day.

Create your free plan

More running tools

Boston Qualifier Calculator

Your Boston standard, the buffer recent cutoffs demanded, and what the new net-downhill rule does to your target.

Training Pace Calculator

Turn a recent race into your easy, marathon, threshold, interval, and repetition paces (VDOT-based).

Race Time Predictor

Predict your 5K, 10K, half, and marathon times from one recent result using Riegel’s formula.

Fitness Forecast

Project the race times you could run after a training block, grounded in real VDOT-improvement research.

Pace Converter

Convert between min/mile, min/km, mph, and kph, and see finish times at any pace.

Fueling Calculator

Build a race fueling plan: carbs per hour, gels to carry, fluid and sodium targets, and timing.