Roman numeral to Arabic numeral converter and vice versa

 
 
This service allows you to convert Roman numeral to Arabic numeral and vice versa.

Roman numeral
The following characters are allowed for Roman numerals:
I, V, X, L, C, D, M

To enter multiplication by 1000 represented by I, V, X, L, C, M, you can use lowercase letters:
i, v, x, l, c, d, m

If the option "Use lowercase letters for thousands" is checked, you can enter max 10011 Roman characters.
If the option "Use lowercase letters for thousands" is unchecked, you can enter max 100005 Roman characters.

Arabic numeral
The following digits are allowed for Arabic numerals:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9

If the option "Use lowercase letters for thousands" is checked, you can enter max 10 digits.
If the option "Use lowercase letters for thousands" is unchecked, you can enter max 8 digits.

Arabic numeral Roman numeral
1I
2II
3III
4IV
5V
6VI
7VII
8VIII
9IX
10X
50L
100C
500D
1000M
1000I
5000V
10000X
50000L
100000C
500000D
1000000M
Examples
4IV
8VIII
30XXX
40XL
90XC
104CIV
400CD
508DVIII
1009MIX
1970MCMLXX
4850IVDCCCL
-- or --
MMMMDCCCL
5710VDCCX
-- or --
MMMMMDCCX
22850XXMMDCCCL
-- or --
MMMMMMMMMMMMM
MMMMMMMMMDCCCL
95000XCV
-- or --
MMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMMMMMMM
MMMMMMMMMMMMMMM


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Input Roman numeral to Arabic numeral converter and vice versa:



Enter Roman or Arabic numeral *: Help Characters entered:   
Use lowercase letters for thousands: Help        
i=1000, v=5000, x=10000, l=50000, c=100000, d=500000, m=1000000
 
* = required  
 


Output Roman numeral to Arabic numeral converter and vice versa: