Easter Date Calculator (Western & Orthodox)

Easter is a movable feast: it falls on the first Sunday after the ecclesiastical full moon on or after 21 March, so its date jumps between 22 March and 25 April in the Western churches. The Orthodox churches use the same rule on the Julian calendar, so their Easter is often one to five weeks later. This calculator gives both dates for any year from 1583 to 4099, the holidays that depend on them, and a 20-year table.

How to use this tool

1. Enter the year.
2. Read the Western (Catholic and Protestant) and Orthodox Easter dates.
3. See the days linked to Easter: Ash Wednesday, Palm Sunday, Good Friday, Ascension and Pentecost.
4. Use the table to plan holidays in the coming years.

Formula

Easter = the Sunday after the paschal full moon, which is found from the year's golden number (year mod 19) and the century corrections

The Western date uses the anonymous Gregorian algorithm (published by Meeus): a = Y mod 19, b = ⌊Y/100⌋, c = Y mod 100, then h = (19a + b − ⌊b/4⌋ − ⌊(b − ⌊(b+8)/25⌋ + 1)/3⌋ + 15) mod 30 and l = (32 + 2(b mod 4) + 2⌊c/4⌋ − h − c mod 4) mod 7 give the month and day. The Orthodox date uses Meeus's Julian algorithm plus the Julian-to-Gregorian difference (13 days in 1900–2099, 14 days from 2100).

Example

In 2026 Western Easter is Sunday 5 April (Ash Wednesday 18 February, Good Friday 3 April, Pentecost 24 May) and Orthodox Easter is Sunday 12 April, one week later. In 2025 both fell on 20 April. Western Easter can be as early as 22 March (1818, 2285) and as late as 25 April (1943, 2038).