Easter Date Calculator
Find Western (Catholic / Protestant) and Eastern Orthodox Easter dates for any year, plus Ash Wednesday, Palm Sunday, Good Friday, and Pentecost.
RELIGION · SOCIALFind Western (Gregorian) and Eastern Orthodox Easter dates for any year from 1583 to 9999, plus the full liturgical season — Ash Wednesday, Palm Sunday, Good Friday, Pentecost, and more.
Uses the Meeus / Jones / Butcher algorithm for Western Easter and a Julian-to-Gregorian computation for Orthodox Easter. Outputs both dates side-by-side, the gap between traditions (often 0, 1, 4, or 5 weeks), and 14 related liturgical days computed by date offset from Easter Sunday.
Easter Date Calculator
Find the date of Western (Gregorian) and Eastern Orthodox Easter for any year from 1583 onward, plus the full liturgical season — Ash Wednesday, Palm Sunday, Good Friday, Pentecost, and more.
Easter in Both Traditions
Liturgical Season
Key dates calculated from Easter Sunday
How Easter Is Calculated
Easter is a moveable feast: it falls on the first Sunday after the first full moon on or after the spring equinox (fixed as March 21 ecclesiastically). The earliest possible Easter is March 22, the latest is April 25.
Western Easter uses the Gregorian calendar and the algorithm published by mathematician Carl Friedrich Gauss in 1800 (also derived independently by Jean Meeus). Eastern Orthodox churches still calculate from the Julian calendar, then convert to Gregorian — which is why their Easter often falls 1, 4, or 5 weeks later.
The two traditions land on the same Sunday in roughly 1 of every 3 years. In 2025 they coincided on April 20. The Council of Nicaea in AD 325 set the formula; in some years, modern Catholic and Orthodox leaders have discussed unifying the date but no agreement has been reached.
Algorithm based on the standard Meeus / Jones / Butcher Gregorian computus and the Julian-to-Gregorian Orthodox computation. Valid from 1583 onward (start of the Gregorian calendar). Local diocesan adjustments are not applied.