Race Calendar & Spacing Planner
Compare races chronologically, flag gaps below your spacing rule and see preparation windows that reach a preceding event.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
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How to use this calculator
Enter each race date and preparation lead, plus your minimum calendar-day spacing. Review the sorted schedule and export race/preparation reminders.
Spacing is the date difference between consecutive events. Preparation runs from the lead date through the event. Duplicate event dates remain visible as zero-day gaps.
A worked example
May 16 and May 23, 2027 are seven days apart, below an entered fourteen-day rule. A ten-day preparation lead for May 23 begins before the earlier race.
Does the spacing rule establish enough recovery?
No. You supply the rule. Event effort, health, experience and recovery needs are not evaluated.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results in that range. Daily plans allow up to 366 dates; dark-sky searches allow 31 nights. Durations, capacities and policy rules are supplied by you. Astronomy uses the bundled Astronomy Engine, sea-level geometry and browser time-zone rules. Timed exports use UTC instants; date-only events do not assign a clock time. Copy, CSV and print include calculation assumptions. Nothing is booked or scheduled outside this page.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.