This template converts Roman numerals to (western) Arabic numerals using Module:roman numerals. The Roman numerals may be expressed using uppercase or lowercase letters. J or j for I or i can also be used.
The template can also be used to check if the specified parameter is a Roman numeral, like this:
{{#if:{{R2A|{{{parameter|}}}|no_error=1}} | The parameter is a Roman numeral | The parameter is not a Roman numeral }}
|1=
: The Roman numeral to be converted to Arabic numerals{{A2R}}