© MMIII - MMV Kirk P. Williams www.weplan.com www.weplan.com
Home page


Page Visitors

Arabic Numeral / Roman Numeral
Date Conversion Chart

for the 19th & 20th Centuries

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 eample does not give a full representation of 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 or MDCCCC

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

 
 
 
Abbreviated listing
for the 21st Century
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
 
 
 
weplan.com Smilin' Bear
Bear created by George M.Sanchez www.georgesanchez.com
L I N K S to related pages
Collectible Sheet Music at weplan.com
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
Grammar and everyday faux pas