Easter Calculator

Easter falls on the first Sunday after the first full moon on or after the spring equinox.

How the Math Works

The Easter Calculator uses the Computus algorithm, a centuries-old method for determining Easter's date in the Gregorian calendar. The process involves calculating the 'golden number' (year modulo 19) to track the lunar cycle, then adjusting for solar corrections and epact values (lunar age offsets). By finding the first Sunday after the calculated 'Paschal Full Moon' date, the algorithm aligns the Christian holiday with both lunar and solar cycles. This anonymous Gregorian formula accounts for leap years, calendar reforms, and astronomical discrepancies to ensure consistency across centuries.

Practical Applications

To use this calculator, simply input any year, and it will output the corresponding Easter Sunday date. This is essential for Christian churches to schedule liturgical events like Lent, Holy Week, and Easter Vigil. Beyond religious contexts, it helps educators plan school breaks, event organizers schedule family-friendly activities, and historians dating historical events tied to Easter. The tool also supports calculating related dates like Ash Wednesday or Pentecost, making it invaluable for ecclesiastical calendars and cultural event planning worldwide.

Day-to-Day Use

Knowing Easter's date impacts countless daily activities, from organizing Easter egg hunts and family picnics to coordinating school holidays and community celebrations. Retailers rely on this date for seasonal promotions, while families plan vacations or gatherings around it. Additionally, understanding Easter's variable timing helps people appreciate the interplay between ancient astronomical methods and modern traditions, enriching cultural awareness and personal planning for one of the most widely observed holidays in the Western world.

Worked example

In 2026 Easter is April 5.

FAQ