MajorMarathon
Pace your Boston Marathon
Boston Marathon Pace Calculator — build marathon splits from your goal time and the real course elevation.
Mon, Apr 19, 2027
Your race plan
Awaiting your goalSet a goal time to build your splits
- Splits shaped by the course's climbs and descents
- Even, negative, or positive split strategies
- Send the plan straight to your watch
Course facts
Boston Marathon records & finishers
| Men's course record | 2:01:52 — John Korir (2026) |
|---|---|
| Women's course record | 2:17:22 — Sharon Lokedi (2025) |
| Average finish time | 3:43:13 (2025) |
| Finishers | 28,468 (2025) |
Pace targets
What pace do you need for a goal-time Boston Marathon?
Average pace per kilometer and mile for common finish-time goals at the Boston Marathon, based on its 42.2 km distance.
| Goal finish | Pace per km | Pace per mile |
|---|---|---|
| 3:00:00 | 4:16/km | 6:52/mi |
| 3:30:00 | 4:59/km | 8:01/mi |
| 4:00:00 | 5:41/km | 9:09/mi |
| 4:30:00 | 6:24/km | 10:18/mi |
| 5:00:00 | 7:07/km | 11:27/mi |
Course notes
How to pace the Boston Marathon
Boston is a net downhill point-to-point that punishes even pacing. The first 4 miles drop roughly 300 feet, and running them at goal effort quietly banks 45–90 seconds of quad damage you pay back after mile 16.
Hold the early downhills 10–20 seconds per mile slower than the pace those grades tempt. The Newton Hills run from mile 16 to 21, with Heartbreak topping out near mile 20.5 — expect to give time back here and plan for it rather than fighting it.
From the top of Heartbreak the course descends again into Boston. Legs that were paced conservatively early can run the final 5 miles strong; legs that raced the opening downhills will only survive them.
Set a goal finish time above and the calculator builds a split plan for this course, grade-adjusted from its elevation profile. New to pacing? Read the pacing strategy guide.
FAQ
Boston Marathon pacing FAQ
Is the Boston Marathon course downhill?
Boston has a net elevation loss of about 140 metres, front-loaded in the first 4 miles. It still climbs roughly 90 metres total, most of it in the Newton Hills between miles 16 and 21.
How should I pace the Newton Hills?
Run the Newton Hills by effort, not pace. Expect each of the four climbs to cost 10–20 seconds per mile, and treat the descent after Heartbreak Hill as the place to make time back.
How do I calculate marathon splits?
Choose a marathon course or distance, enter your goal finish time, select kilometers or miles, and generate a split-by-split pacing plan.
Should marathon pace change on hills?
A hill-adjusted plan usually slows the target pace on climbs and allows faster splits on descents so the effort stays more even across the course.
What is an elevation-adjusted pace plan?
An elevation-adjusted pace plan uses the course profile to distribute effort by split instead of assuming the same pace for every kilometer or mile. The goal is to slow slightly on climbs, recover time on descents, and still hit your target finish time.
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