Marathon Cutoff & Pace Band
Calculate checkpoint clock times and cutoff margins with gun time, start delay and rest. Save your plan as a printable pace-band PDF.
Input
Example only; not an official timetable.
Checkpoint plan
Calculate immediately with the editable example.
Rest is assumed to be spread evenly in proportion to distance. Actual aid stops, hills and congestion are not modeled.
Planning only, not an official cutoff decision. Check the rules for your race.
Moving pace is rounded for display. Cutoff comparisons use unrounded values.
How start delay and rest are calculated
Calculate the remaining cutoff time and checkpoint arrivals after a delayed start, then save the same plan as a printable pace band.
Input example
In this fictional example the gun is at 07:30, your start delay is 18 minutes, and the gun-time finish limit is 300 minutes. From your actual start at 07:48, 282 minutes (4 hours 42 minutes) remain. A 280-minute target including 7 minutes of rest gives arrival at 12:28, 2 minutes before the 12:30 cutoff. Switching the same 300-minute limit to actual-start timing makes the cutoff 12:48.
How to use
- Check your race gun time and cutoff basis, then enter your start delay and target duration including rest.
- If a checkpoint has an official cutoff, enter its distance and elapsed cutoff minutes. All cutoffs use the selected gun or actual-start basis.
- Check arrival times and margins, then create your PDF. Print at 100% scale and cut along the borders to use it as a pace band.
Supported range and boundaries
Supports 1–300 km, 49 intermediate checkpoints plus the finish, and up to 72 hours after the gun. Times after midnight show a day offset. Dates, time zones, daylight-saving transitions and course elevation are not modeled.
Assumes a constant moving pace and rest proportional to distance. It does not predict individual aid-stop plans or running ability. Arrival exactly at the cutoff has no safety margin. Official race decisions and updates take precedence.
Inputs and PDFs are processed in your browser, with no server upload or automatic saving. Refreshing or leaving the page restores the public example.
Frequently Asked Questions
How do gun and actual-start timing differ?
A gun-time cutoff runs from the gun, so a delayed start reduces your available time. An actual-start cutoff runs from the moment you cross the start. This tool does not choose your race timing rules automatically.
How does rest affect checkpoint times?
Your target is the total time after your actual start, including rest. Moving time is target minus rest, and cumulative rest at each checkpoint is total rest multiplied by the distance fraction. This may differ from a plan to stop at specific aid stations.
What if intermediate and finish cutoffs use different timing bases?
The tool applies one timing basis to every cutoff. Do not mix timing bases within a calculation. Convert all deadlines to elapsed minutes from one basis using your race instructions, or calculate the bases separately and check the official guidance.
Calculation criteria and reference materials
- JTBC Seoul Marathon — 2026 Start Time Update
Check start times in the race organizer’s announcement. This notice is an example from the 2026 event; enter the verified gun or wave start and cutoff rules for your own race.
Verification of calculation criteria: · Calculation·verification principles · Report errors