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Easter Calculator

Easter's date shifts annually between late March and late April, determined by ancient ecclesiastical rules rather than a fixed calendar date. This calculator pinpoints Easter Sunday for any year by applying the Computus algorithm—a calculation method that accounts for the spring equinox and the first full moon thereafter. Planners, historians, and Christians rely on it to coordinate holidays, events, and observances.

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Creators Mateusz Mucha, BEng
8,230 people find this calculator helpful

Understanding Easter's Moveable Date

Easter is Christianity's most significant celebration, commemorating the resurrection of Christ. Unlike Christmas, which falls on December 25th every year, Easter is a moveable feast whose date depends on lunar and solar cycles recognized by the Church.

The Church established a fixed astronomical reference point: the spring equinox occurs on March 21st. However, Easter is not celebrated on the equinox itself. Instead, it is observed on the first Sunday following the Paschal full moon—the first full moon that occurs on or after the spring equinox.

This arrangement means Easter can fall anywhere between March 22nd and April 25th, varying by up to 35 days from year to year. Understanding this pattern helps explain why Easter dates seem unpredictable to those unfamiliar with ecclesiastical calendars.

The Computus Algorithm

The Easter date calculation, known as the Computus, works through these sequential steps:

  1. Establish the spring equinox date (ecclesiastical: March 21st)
  2. Determine the Paschal full moon—the first full moon on or after the equinox
  3. Identify the first Sunday following the Paschal full moon
  4. That Sunday is Easter Sunday

Modern implementations convert calendar dates to days since epoch (a reference point), apply modular arithmetic to find lunar phases, and then calculate the subsequent Sunday.

Paschal Full Moon = First full moon ≥ March 21st

Easter Sunday = First Sunday after Paschal Full Moon

j = day mod 10

k = day mod 100

  • Paschal Full Moon — The ecclesiastical full moon falling on or after the spring equinox (March 21st)
  • Easter Sunday — The first Sunday immediately following the Paschal full moon
  • j — Day value modulo 10, used in intermediate Computus calculations
  • k — Day value modulo 100, used in intermediate Computus calculations

Easter Dates Reference: 2024–2031

Below are confirmed Easter dates and their corresponding Paschal full moons for the next several years:

YearPaschal Full MoonEaster Sunday
2024March 25thMarch 31st
2025April 13thApril 20th
2026April 2ndApril 5th
2027March 22ndMarch 28th
2028April 9thApril 16th
2029March 30thApril 1st
2030April 18thApril 21st
2031April 7thApril 13th

Bookmark this table if you need to plan events or holidays multiple years in advance.

Common Misconceptions and Pitfalls

Avoid these frequent errors when discussing or calculating Easter dates.

  1. The equinox is not always March 21st astronomically — The Church uses March 21st as a fixed reference, even though the astronomical spring equinox typically occurs on March 19th or 20th. This deliberate choice simplifies calculations across centuries.
  2. Easter cannot fall before March 22nd or after April 25th — These boundaries are absolute. The earliest Easter can occur is March 22nd (last happened in 1818); the latest is April 25th (next in 2038). Any claim outside this range is incorrect.
  3. The Paschal full moon is ecclesiastical, not astronomical — Church calculations use a simplified lunar calendar that doesn't always align with actual astronomical full moons. This is by design and ensures consistency for liturgical planning.
  4. Not all Christian denominations celebrate on the same date — Western churches follow the Gregorian calendar, while some Eastern Orthodox churches use the Julian calendar, resulting in different Easter dates. Always clarify which tradition applies.

Frequently Asked Questions

Why does Easter change dates every year?

Easter's date depends on two celestial events: the spring equinox (March 21st by Church decree) and the Paschal full moon. Since the lunar cycle doesn't align perfectly with the solar year, the full moon falls on different dates annually, shifting Easter between March 22nd and April 25th. This link between lunar and solar calendars makes Easter moveable, unlike fixed holidays.

When is Easter in 2025?

Easter Sunday in 2025 falls on April 20th. The Paschal full moon that year occurs on April 13th (a Sunday itself), so Easter is observed on the following Sunday. You can use this calculator to verify the date for any year and to count down the remaining days.

Has Easter ever coincided with April Fool's Day?

Yes, this rare alignment happened in 1956 and will occur again in 2029. Because Easter must fall after March 21st and April 1st is relatively late in the possible range, the overlap is uncommon. Fewer than five times per century does April 1st actually fall on the Sunday required for Easter.

How far in advance can Easter dates be calculated?

Easter dates can be calculated for any year in the past or future using the Computus algorithm. However, practical limitations exist: historical records are less reliable for centuries before the Gregorian calendar reform (1582), and the method assumes ecclesiastical rules remain unchanged. For years beyond 2500, ensure your calculation tool accounts for potential calendar modifications.

What is the difference between the Paschal full moon and the actual astronomical full moon?

The Paschal full moon is a theoretical date used by the Church, based on simplified lunar tables that don't always match real astronomical observations. This separation ensures consistency—a church in Rome and one in Sydney calculate the same Paschal full moon on the same day, regardless of actual lunar visibility. Real astronomical full moons may occur 1–2 days before or after the ecclesiastical date.

Do all Christian churches celebrate Easter on the same date?

Western Christian denominations (Catholic, Protestant) follow the Gregorian calendar and celebrate Easter on the date calculated by the Computus. Eastern Orthodox churches use the Julian calendar with their own calculation method, often resulting in Easter dates that differ by one to five weeks. Some Oriental Orthodox traditions follow yet different rules, so Easter observance varies globally.

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