MajorMarathon
Pace your Chicago Marathon
Chicago Marathon Pace Calculator — build marathon splits from your goal time and the real course elevation.
Sun, Oct 11, 2026
Course profile
- Distance
- 42.2km
- Gain
- ↑ 5m
- Loss
- ↓ 6m
- Steepest km
- +0.3%
Set 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 notes
How to pace the Chicago Marathon
Chicago is as flat as a major marathon gets — about 30 metres of total climb across 42 km — which makes even splits a genuinely viable plan here.
The real pacing risk is the start. The first two miles wind through the tall buildings of the Loop where GPS drifts badly and the crowd is dense; run these by feel and expect your watch to lie.
With no hills to force a rhythm, discipline comes from the clock. Lock onto goal pace by 5 km, hold it through the neighbourhoods, and save any surge for the last 5 km on Michigan Avenue and the short rise to the finish on Roosevelt Road.
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
Chicago Marathon pacing FAQ
Is the Chicago Marathon good for a PR?
Yes. Chicago is flat, loop-shaped, and run in cool October weather, which is why it produces so many personal bests and world records. Even pacing works well here.
Why is my GPS inaccurate at the start of the Chicago Marathon?
The opening miles run between tall buildings in the Loop, which reflects and blocks GPS signal. Expect your watch pace to jump around for the first 2 miles and pace by effort until it settles.
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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