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Roman numbers

Arabic number	Roman number
1	I
2	II
3	III
4	IV
5	V
6	VI
7	VII
8	VIII
9	IX
10	X
20	XX
30	XXX
40	XL
50	L
60	LX
70	LXX
80	LXXX
90	XC
100	C
200	CC
300	CCC
400	CD
500	D
600	DC
700	DCC
800	DCCC
900	CM
1000	M
1500	MD
2000	MM
3000	MMM
4000	MMMM
5000	V
10 000	X
50 000	L
100 000	C
500 000	D
1000 000	M

Some facts

Numbers written in the Roman system consist of 7 letters: I(1), V(5), X(10), L(50), C(100), D(500), M(1000).
In the basic version, the maximum Roman digit (M) has the value of 1000. However, sometimes overline is used to multiply digit value by 1000.
To read the value of the Roman number we count value of digits from left to right, following the rule below:
- if the current number is the same or greater than the next one, then we add it to the result value (e.g. XI gives 10 + 1 = 11),
- if the current number is smaller than the next one, then we subtract it (e.g. IX gives 10 - 1 = 9).
Despite the spread of the Arabic system, Roman numerals can still be found in some traditional applications, e.g.
- century numeration e.g. XXI means 21st century,
- sometimes dates e.g. in cinematography or to mark date of building construction e.g. MMXVIII (2018),
- names of rulers, e.g. Louis XVI, John Paul II,
- names of historical events, e.g. World War II,
- sometimes chapters numbering in books,
- months numbering, e.g. 31.XII.2018 (31 December 2018).

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roman_numbers · roman_to_arabic_table · arabic_to_roman_table

Tags to Polish version:

liczby_rzymskie · rzymskie_na_arabskie_tabela · arabskie_na_rzymskie_tabela

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