Dias Páscoa anual
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The 'Annual Easter Days' calculator determines the date of Easter for any year in the Gregorian calendar. Easter is a movable feast that occurs on the first Sunday following the Paschal Full Moon, the first full moon after the vernal equinox. The tool uses the Computus algorithm, based on astronomical calculations and lunar calendars, to find the exact date. It's useful for planning religious events, festivals, or understanding Easter's cycle across years.
The calculation follows rules set by the Catholic Church and other Christian traditions. First, the Paschal Full Moon is identified, which can vary between March 21 and April 18. Then, the Sunday immediately after is determined. If the full moon falls on a Sunday, Easter is the following Sunday. This tool automatically adjusts for these variables.
Use this calculator to compare dates across consecutive years, plan family or academic celebrations, or study historical Easter patterns. For example, in 2024, Easter is on March 31, while in 2025, it will be on April 20. Note: The exact date may differ across religious traditions, and this calculation adheres to the Western Gregorian standard.
Important: Easter can occur between March 22 and April 25 in the Gregorian calendar. The tool requires a valid year (1583 onward, when the Gregorian calendar was introduced). If the user inputs an invalid format or a year outside the supported range, the result may be inaccurate. Always verify the year to avoid discrepancies.
Frequently asked questions
Why does Easter change every year?
Easter is tied to the lunar cycle and the vernal equinox in the Northern Hemisphere, depending on the first full moon after March 21. Since these astronomical events vary, so does the date.
Does this calculator use the Gregorian calendar?
Yes, the calculation follows the Gregorian calendar, officially adopted in 1583. Years before that use the Julian calendar in some traditions, but are not supported here.
How can Easter fall on March 22?
If the first full moon after the equinox occurs on April 18 and is followed by a Sunday, Easter will be on March 22, the first Sunday of spring.
Does the calculator work for years before 1583?
No, the Gregorian calendar was introduced in 1583. Earlier years require calculations based on the Julian calendar, which are not implemented in this tool.