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Roman Numeral Converter

Convert between Roman numerals and decimal numbers

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Roman Numeral Converter Hakkinda

Convert decimal numbers to Roman numerals (1-3999) or Roman numerals back to decimal. Shows the breakdown of each numeral component.

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For decimal to Roman: decomposes the number into Roman numeral components (M=1000, CM=900, D=500, etc.) using subtractive notation. For Roman to decimal: parses each character pair, validates the result by round-tripping.

Adim Adim

1 [
2 '
3 S
4 e
5 l
6 e
7 c
8 t
9
10 c
11 o
12 n
13 v
14 e
15 r
16 s
17 i
18 o
19 n
20
21 d
22 i
23 r
24 e
25 c
26 t
27 i
28 o
29 n
30 :
31
32 t
33 o
34
35 R
36 o
37 m
38 a
39 n
40
41 o
42 r
43
44 t
45 o
46
47 D
48 e
49 c
50 i
51 m
52 a
53 l
54 '
55 ,
56
57 '
58 E
59 n
60 t
61 e
62 r
63
64 a
65
66 n
67 u
68 m
69 b
70 e
71 r
72
73 (
74 1
75 -
76 3
77 9
78 9
79 9
80 )
81
82 o
83 r
84
85 a
86
87 R
88 o
89 m
90 a
91 n
92
93 n
94 u
95 m
96 e
97 r
98 a
99 l
100
101 s
102 t
103 r
104 i
105 n
106 g
107 '
108 ,
109
110 '
111 C
112 l
113 i
114 c
115 k
116
117 C
118 o
119 n
120 v
121 e
122 r
123 t
124
125 t
126 o
127
128 s
129 e
130 e
131
132 t
133 h
134 e
135
136 r
137 e
138 s
139 u
140 l
141 t
142
143 a
144 n
145 d
146
147 b
148 r
149 e
150 a
151 k
152 d
153 o
154 w
155 n
156 '
157 ]

Ipuclari

[
'
V
a
l
i
d
R
o
m
a
n
n
u
m
e
r
a
l
s
u
s
e
:
I
,
V
,
X
,
L
,
C
,
D
,
M
'
,
'
S
u
b
t
r
a
c
t
i
v
e
n
o
t
a
t
i
o
n
:
I
V
=
4
,
I
X
=
9
,
X
L
=
4
0
,
X
C
=
9
0
,
C
D
=
4
0
0
,
C
M
=
9
0
0
'
,
'
M
a
x
i
m
u
m
v
a
l
u
e
i
s
3
9
9
9
(
M
M
M
C
M
X
C
I
X
)
'
,
'
T
h
e
c
o
n
v
e
r
t
e
r
v
a
l
i
d
a
t
e
s
R
o
m
a
n
n
u
m
e
r
a
l
s
a
n
d
w
a
r
n
s
a
b
o
u
t
n
o
n
-
s
t
a
n
d
a
r
d
f
o
r
m
s
'
]

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