Roman Numeral Converter

Convert numbers to Roman numerals, or Roman numerals back to numbers — both directions, instantly and locally.

Number → Roman

Enter a whole number (1 – 3999)

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Roman → Number

Enter Roman numerals (I, V, X, L, C, D, M)

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Quick reference

How Roman numerals work

Seven letters represent values: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Numbers are built by adding values together, and a smaller value placed before a larger one is subtracted — so IV is 4 and IX is 9. This converter supports the standard range of 1 to 3,999.