This Roman numeral converter transforms between roman numeral and Arabic numbers (and viceversa) so you can decipher the values you need. You can read more on the subject and discover the symbols used below the form.


Enter the Arabic or Roman number:*

How does this Roman numeral converter work?

Need to convert Roman numeral to Arabic or the reverse? You can use the above tool by inputting the Roman numeral, or the Arabic between 1 and 4999 and pressing the Convert button.  

Please note that the Roman numeral converter allows the conversion only up to 4999 because numbers higher than this are formed by placing a dash over the symbol, that means "times 1,000" and this cannot be represented in ASCII format.

The roman numerals letters are:

I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000;

The Roman Numeral Converter uses the following Roman numerals principles and rules:

- letters need to be arranged from the largest to the smallest value, each value will be added to the previous ones ( 155= CLV not VLC or other combinations);

- only powers of ten: I, X, C, M; can be repeated;

- do not repeat any letter more than three times in a row (44 = XLIV not XLIIII);

- symbols V, L and D cannot appear more than once consecutively;

- in case that a letter representing a smaller value precedes one with a larger value, the value of the smaller one is subtracted from the larger and the result is added to the rest of the letters;

- only powers of ten (I, X, C, M) can be subtracted.

The most used and searched roman numerals chart for Arabic numbers between 1 and 1000 are presented below:

Arabic Roman Arabic Roman Arabic Roman
1 I 21 XXI 41 XLI
2 II 22 XXII 42 XLII
3 III 23 XXIII 43 XLIII
4 IV 24 XXIV 44 XLIV
5 V 25 XXV 45 XLV
6 VI 26 XXVI 46 XLVI
7 VII 27 XXVII 47 XLVII
8 VIII 28 XXVIII 48 XLVIII
9 IX 29 XXIX 49 XLIX
10 X 30 XXX 50 L
11 XI 31 XXXI 60 LX
12 XII 32 XXXII 70 LXX
13 XIII 33 XXXIII 80 LXXX
14 XIV 34 XXXIV 90 XC
15 XV 35 XXXV 100 C
16 XVI 36 XXXVI 200 CC
17 XVII 37 XXXVII 300 CCC
18 XVIII 38 XXXVIII 400 CD
19 XIX 39 XXXIX 500 D
20 XX 40 XL 1000 M

16 Mar, 2015 | 0 comments

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