Compute Easter Sunday dates on the Gregorian calendar using the standard computus algorithm adopted by Western Christian churches (Roman Catholic, Protestant, and most Orthodox communities that follow the Revised Julian calendar for fixed feasts).
What this tool calculates
Given a year (or range of years), the tool returns the Gregorian date of Easter Sunday—the movable feast that falls on the first Sunday after the first full moon on or after the March equinox (ecclesiastical approximation).
Algorithm background
The implementation follows the Anonymous Gregorian algorithm (Meeus/Jones/Butcher variant), which encodes the ecclesiastical rules fixed at the First Council of Nicaea (325 CE) and reformed under Pope Gregory XIII in 1583. Leap-year and century rules from the Gregorian calendar are part of the calculation.
When to use it
- Planning public holidays tied to Easter (Good Friday, Easter Monday in many countries)
- Scheduling school terms, church events, or retail campaigns
- Comparing Gregorian Easter with Julian-calendar Easter in the same year
Limitations
Results reflect Western computus, not the Julian Easter date used by some Eastern Orthodox churches on the old calendar. Historical dates before the Gregorian reform (1582) may differ from what was observed locally at the time. The tool does not account for national holiday observance rules (e.g., when a public holiday is moved to Monday).
Example
Easter 2025 falls on 20 April (Gregorian). Easter 2024 was 31 March.