Roman Numeral Converter

Convert numerals to decimal numbers and back instantly.

How does the Roman Numeral Converter work?

Roman numerals originate from ancient Rome and use letters from the Latin alphabet to represent values. They remained the standard way of writing numbers throughout Europe well into the late Middle Ages.

The symbols used are:

Roman Numeral Chart

Number Roman Number Roman
1 I 10 X
2 II 50 L
3 III 100 C
4 IV 500 D
5 V 1000 M

Rules of Roman Numerals

Addition: When a symbol appears after a larger (or equal) symbol, it is added. Example: VI = V + I = 5 + 1 = 6.

Subtraction: When a symbol appears before a larger symbol, it is subtracted. Example: IV = V - I = 5 - 1 = 4.

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