How to convert roman numerals to number?

Roman numerals to decimal number conversion

Roman numeral (n) Decimal value (v)
I 1
IV 4
V 5
IX 9
X 10
XL 40
L 50
XC 90
C 100
CD 400
D 500
CM 900
M 1000

Example #1

r = XXXVI

Iteration # Highest roman numeral (n) Highest decimal value (v) Decimal number (x)
1 X 10 10
2 X 10 20
3 X 10 30
4 V 5 35
5 I 1 36

 

Example #2

r = MMXII

Iteration # Highest roman numeral (n) Highest decimal value (v) Decimal number (x)
1 M 1000 1000
2 M 1000 2000
3 X 10 2010
4 I 1 2011
5 I 1 2012

 

 

Example #3

r = MCMXCVI

Iteration # Highest roman numeral (n) Highest decimal value (v) Decimal number (x)
1 M 1000 1000
2 CM 900 1900
3 XC 90 1990
4 V 5 1995
5 I 1 1996
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