Convert Regnal Years to Calendar Years

In early English legal documents, the year is often given as the number of years in a particular monarch’s reign.  For example, Charles I acceded to the throne on 27th March 1625 so his first ‘Regnal Year’ ran from 27th March 1625 to 26 March 1626.  So 3rd June 1633 might appear as ‘3rd June 9 Charles I’ meaning the 3rd June in the 9th year of his reign.  Apart from Henry II, Richard I and Henry III, a monarch’s reign was considered to begin when the previous monarch died, abdicated or was deposed —  the Coronation date is always a little later.  The dates given for a monarch’s reign are all in the present Gregorian calendar.

To discover the Calendar Year from a given Regnal Year, choose
the Monarch and date, enter the Regnal Year and click on ‘Find’.

              Monarch                  Day         Month                   Year of Reign (Regnal Year)    


This monarch reigned  

The calendar year is  


  Where two calendar years are given in the converter, say 1605/6, for a date from New Year to Lady Day, the first is the Julian year date and the second the Gregorian year which applied in Italy from 1582. Sometimes they are called 'Old Style'/'New Style' calendars.  The two years agreed after March 24th each year and from 1752 onwards only the modern Gregorian calendar was and is used in England and her colonies.  More information on the two calendars.

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