Convert dates between the Gregorian and Coptic (Egyptian) calendars with this Coptic Calendar Converter. Choose your conversion direction, then enter a Gregorian date (month, day, year) or a Coptic date (month, day, year) to get the equivalent date in the other calendar system — along with the Coptic month name, day of week, and whether it falls in a leap year.
Converted Date
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Month Name
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Day of Week
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Leap Year?
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Coptic Year (Anno Martyrum)
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The Coptic calendar is an evolution of the Ancient Egyptian calendar. It has 12 months of 30 days each, plus a 13th intercalary month (Nasie) of 5 or 6 days. The calendar is still used today by the Coptic Orthodox Church and Egyptian farmers.
Coptic years are counted from August 29, 284 CE (Julian), the year the Roman Emperor Diocletian came to power. This era is known as the 'Era of the Martyrs' (Anno Martyrum) because of the widespread persecution of Christians under Diocletian.
Select 'Gregorian → Coptic' as the conversion direction, then enter the month, day, and year of your Gregorian date. The calculator will compute the corresponding Coptic month, day, and year using standard Julian Day Number arithmetic.
The 13 Coptic months are: Tout, Baba, Hator, Kiahk, Toba, Amshir, Baramhat, Baramouda, Bashans, Paona, Epep, Mesra, and Nasie. The first 12 months each have 30 days; the intercalary month Nasie has 5 days in an ordinary year and 6 in a leap year.
The Coptic calendar adds a leap day every 4 years, similar to the Julian calendar. A Coptic year is a leap year if dividing it by 4 leaves a remainder of 3 (i.e., coptic_year % 4 === 3). The extra day is added to the 13th month, Nasie, making it 6 days instead of 5.
The Coptic New Year (1 Tout) currently falls on September 11 in the Gregorian calendar (or September 12 in a Gregorian leap year). The Coptic year runs approximately 13 years behind the Gregorian year — for example, 2025 CE corresponds roughly to 1741–1742 AM in the Coptic calendar.
Yes. The Coptic Orthodox Church of Alexandria uses the Coptic calendar to set its liturgical feasts and holidays. Egyptian farmers also traditionally use it to track agricultural seasons, a practice that dates back thousands of years to ancient Egypt.
The Coptic calendar shares the same leap year rule and year length as the Julian calendar (365.25 days), but uses a different month structure (12 × 30 days + intercalary month) and a different epoch (284 CE vs 1 CE). Coptic dates align closely with Julian dates and drift slowly relative to the Gregorian calendar.