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 Arabic Numeral / Roman Numeral Date Conversion Chart
  for the 19th & 20th Centuries with a few in the 21st Century
 
 
The Simple Principle
Roman numerals are mathematically converted to Arabic numerals simply through the assignment of an Arabic numerical value to each letter and calculating a total.

Example
M=1000 | D=500 | C=100 | L=50 | X=10 | V=5 | I=1
The letters (roman numerals) are arranged from left to right with each letter decreasing in value as you go "down the line." The totals are derived through adding the numerical equivalent of all the letters.

Therefore . . .
MDCLXVI = 1000 + 500 + 100 + 50 + 10 + 5 + 1 = 1666.

Generally
The above example is not a full representation of the present day convention. The current rules regarding the use of Roman numerals have been employed only in relatively recent times. It appears that the principle of "subtraction" has always been used, but in earlier periods of history, the use of subtraction was an alternative to the more simplistic use addition.

Today, the convention is to use the largest possible numeral within a sequence. Therefore, 15 is XV and not VVV or XIIIII. Although Roman numerals generally read from left to right in descending order, this leads to some extremely long sequences! (99 would be LXXXXVIIII.)

Be aware . . . only I, X, and C can be used this way. V, L, and D cannot. And, M cannot because it is the largest Roman numeral available! Also, only a single smaller number can be placed to the left of a larger number. 18 cannot be written XIIX as it would be ambiguous and could be interpreted as 11 + 9 = 20 instead of 10 - 2 + 10 = 18.

The subtracted number can be no less than a 10th of the value of the number from which it is being subtracted. So, an X can be placed to the left of a C or an L but not to the left of an M or a D. Each power of ten is dealt with separately. So, 49 is XLIX and not IL 

Microsoft Excel® provides a function to reflect numbers in Roman numeral format. In order to display Roman numerals, type "=ROMAN(n)" where "n" is your Arabic numeral. To convert Arabic numbers into Roman numerals, type (in a blank cell) "ROMAN(A1)" where the "A1" references the cell containing the Arabic numeral you wish to convert.

19th Century


 1801 = MDCCCI 
 1802 = MDCCCII 
 1803 = MDCCCIII 
 1804 = MDCCCIV 
 1805 = MDCCCV 
 1806 = MDCCCVI 
 1807 = MDCCCVII 
 1808 = MDCCCVIII 
 1809 = MDCCCIX 
 1810 = MDCCCX




 1811 = MDCCCXI 
 1812 = MDCCCXII 
 1813 = MDCCCXIII 
 1814 = MDCCCXIV 
 1815 = MDCCCXV 
 1816 = MDCCCXVI 
 1817 = MDCCCXVII 
 1818 = MDCCCXVIII 
 1819 = MDCCCXIX 
 1820 = MDCCCXX




 1821 = MDCCCXXI 
 1822 = MDCCCXXII 
 1823 = MDCCCXXIII 
 1824 = MDCCCXXIV 
 1825 = MDCCCXXV 
 1826 = MDCCCXXVI 
 1827 = MDCCCXXVII 
 1828 = MDCCCXXVIII 
 1829 = MDCCCXXIX 
 1830 = MDCCCXXX




 1831 = MDCCCXXXI 
 1832 = MDCCCXXXII 
 1833 = MDCCCXXXIII 
 1834 = MDCCCXXXIV 
 1835 = MDCCCXXXV 
 1836 = MDCCCXXXVI 
 1837 = MDCCCXXXVII 
1838 = MDCCCXXXVIII 
 1839 = MDCCCXXXIX 
 1840 = MDCCCXL




 1841 = MDCCCXLI 
 1842 = MDCCCXLII 
 1843 = MDCCCXLIII 
 1844 = MDCCCXLIV 
 1845 = MDCCCXLV 
 1846 = MDCCCXLVI 
 1847 = MDCCCXLVII 
 1848 = MDCCCXLVIII 
 1849 = MDCCCXLIX 
 1850 = MDCCCL




 1851 = MDCCCLI 
 1852 = MDCCCLII 
 1853 = MDCCCLIII 
 1854 = MDCCCLIV 
 1855 = MDCCCLV 
 1856 = MDCCCLVI 
 1857 = MDCCCLVII 
 1858 = MDCCCLVIII 
 1859 = MDCCCLIX 
 1860 = MDCCCLX




 1861 = MDCCCLXI 
 1862 = MDCCCLXII 
 1863 = MDCCCLXIII 
 1864 = MDCCCLXIV 
 1865 = MDCCCLXV 
 1866 = MDCCCLXVI 
 1867 = MDCCCLXVII 
 1868 = MDCCCLXVIII 
 1869 = MDCCCLXIX 
 1870 = MDCCCLXX




 1871 = MDCCCLXXI 
 1872 = MDCCCLXXII 
 1873 = MDCCCLXXIII 
 1874 = MDCCCLXXIV 
 1875 = MDCCCLXXV 
 1876 = MDCCCLXXVI 
 1877 = MDCCCLXXVII 
 1878 = MDCCCLXXVIII
 1879 = MDCCCLXXIX 
 1880 = MDCCCLXXX




 1881 = MDCCCLXXXI 
 1882 = MDCCCLXXXII 
 1883 = MDCCCLXXXIII 
 1884 = MDCCCLXXXIV 
 1885 = MDCCCLXXXV 
 1886 = MDCCCLXXXVI 
 1887 =MDCCCLXXXVII
 1888=MDCCCLXXXVIII 
 1889 = MDCCCLXXXIX
 1890 = MDCCCXC




 1891 = MDCCCXCI 
 1892 = MDCCCXCII 
 1893 = MDCCCXCIII 
 1894 = MDCCCXCIV 
 1895 = MDCCCXCV 
 1896 = MDCCCXCVI 
 1897 = MDCCCXCVII 
 1898 = MDCCCXCVIII 
 1899 = MDCCCXCIX 
 1900=MCM orMDCCCC


20th Century


 1901 = MCMI 
 1902 = MCMII 
 1903 = MCMIII 
 1904 = MCMIV 
 1905 = MCMV 
 1906 = MCMVI 
 1907 = MCMVII 
 1908 = MCMVIII 
 1909 = MCMIX 
 1910 = MCMX




 1911 = MCMXI 
 1912 = MCMXII 
 1913 = MCMXIII 
 1914 = MCMXIV 
 1915 = MCMXV 
 1916 = MCMXVI 
 1917 = MCMXVII 
 1918 = MCMXVIII 
 1919 = MCMXIX 
 1920 = MCMXX




 1921 = MCMXXI 
 1922 = MCMXXII 
 1923 = MCMXXIII 
 1924 = MCMXXIV 
 1925 = MCMXXV 
 1926 = MCMXXVI 
 1927 = MCMXXVII 
 1928 = MCMXXVIII 
 1929 = MCMXXIX 
 1930 = MCMXXX




 1931 = MCMXXXI 
 1932 = MCMXXXII 
 1933 = MCMXXXIII 
 1934 = MCMXXXIV 
 1935 = MCMXXXV 
 1936 = MCMXXXVI 
 1937 = MCMXXXVII 
 1938 = MCMXXXVIII 
 1939 = MCMXXXIX 
 1940 = MCMXL
 




 1941 = MCMXLI 
 1942 = MCMXLII 
 1943 = MCMXLIII 
 1944 = MCMXLIV 
 1945 = MCMXLV 
 1946 = MCMXLVI 
 1947 = MCMXLVII 
 1948 = MCMXLVIII 
 1949 = MCMXLIX 
 1950 = MCML




 1951 = MCMLI 
 1952 = MCMLII 
 1953 = MCMLIII 
 1954 = MCMLIV 
 1955 = MCMLV 
 1956 = MCMLVI 
 1957 = MCMLVII 
 1958 = MCMLVIII 
 1959 = MCMLIX 
 1960 = MCMLX




 1961 = MCMLXI 
 1962 = MCMLXII 
 1963 = MCMLXIII 
 1964 = MCMLXIV 
 1965 = MCMLXV 
 1966 = MCMLXVI 
 1967 = MCMLXVII 
 1968 = MCMLXVIII 
 1969 = MCMLXIX 
 1970 = MCMLXX




 1971 = MCMLXXI 
 1972 = MCMLXXII 
 1973 = MCMLXXIII 
 1974 = MCMLXXIV 
 1975 = MCMLXXV 
 1976 = MCMLXXVI 
 1977 = MCMLXXVII 
 1978 = MCMLXXVIII 
 1979 = MCMLXXIX 
 1980 = MCMLXXX




 1981 = MCMLXXXI 
 1982 = MCMLXXXII 
 1983 = MCMLXXXIII 
 1984 = MCMLXXXIV 
 1985 = MCMLXXXV 
 1986 = MCMLXXXVI 
 1987 = MCMLXXXVII 
 1988 = MCMLXXXVIII 
 1989 = MCMLXXXIX 
 1990 = MCMXC




 1991 = MCMXCI 
 1992 = MCMXCII 
 1993 = MCMXCIII 
 1994 = MCMXCIV 
 1995 = MCMXCV 
 1996 = MCMXCVI 
 1997 = MCMXCVII 
 1998 = MCMXCVIII 
 1999 = MCMXCIX 
 2000 = MM

 
 
 
 

2001 = MMI
2002 = MMII
2003 = MMIII
2004 = MMIV
2005 = MMV
2006 = MMVI
2007 = MMVII
2008 = MMVIII
2009 = MMIX
2010 = MMX



2011 = MMXI

2012 = MMXII
2013 = MMXIII
2014 = MMXIV
2015 = MMXV
2016 = MMXVI
2017 = MMXVII
2018 = MMXVIII
2019 = MMXIX
2020 = MMXX

 
 
Abbreviated listing
21st Century


2001 = MMI
2002 = MMII
2003 = MMIII
2004 = MMIV
2005 = MMV
2006 = MMVI
2007 = MMVII
2008 = MMVIII
2009 = MMIX
2010 = MMX





2011 = MMXI

2012 = MMXII
2013 = MMXIII
2014 = MMXIV
2015 = MMXV
2016 = MMXVI
2017 = MMXVII
2018 = MMXVIII
2019 = MMXIX
2020 = MMXX


 


   
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L I N K S to related pages
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Otfried Lieberknecht's Calendar Tools
 (a JavaScript calculator) to convert Roman Numeral calendar dates.
Stephen Ostermiller's Roman Numeral Converter and Self Test
Steven Gibbs' Roman Numeral Calculator
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