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Use our free Roman numeral converter to convert any decimal to Roman numerals (up to 3,999,999) or parse Roman numerals to decimal with full breakdown showing token decomposition, subtractive notation, construction steps, and equivalents in binary, hex, and octal.
A full bidirectional Roman numeral converter. Convert decimal to Roman with construction steps, or parse Roman to decimal with token breakdown. Info mode provides validation, subtractive pair detection, and adjacent values.
Dec↔Roman: I=1, V=5, X=10, L=50, C=100, D=500, M=1000Percentage: The percentage value you want to apply
Number: The original number or value
Result: The calculated result
Result: MMXXIV
Result: 14
CalculateMe Team
Last updated: 2026-07-15