Roman Numeral Converter
Convert any whole number from 1 to 3999 into a Roman numeral, or decode a Roman numeral back into a regular number.
Number to Roman
MCMXCIV
Roman to Number
1994
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Frequently asked questions
Why is the range limited to 1-3999?+
Standard Roman numerals don't have a symbol for zero and conventionally cap at MMMCMXCIX (3999) without special overline notation for larger numbers.
Does it accept non-standard forms like IIII for 4?+
No, it validates against the standard subtractive notation (IV, not IIII), so non-canonical forms are rejected as invalid.
Is the input case-sensitive?+
No, lowercase Roman numerals like "mcmxciv" are automatically converted to uppercase before parsing.