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Roman Numerals

A table of Roman numerals, writing rules, and conversion to standard numbers — plus a trainer to help you memorize them.

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Roman Numerals Table

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Frequently Asked Questions

What are Roman numerals?

Roman numerals are a number system where numbers are written using letters: I=1, V=5, X=10, L=50, C=100, D=500, M=1000.

How do you convert Roman numerals to standard numbers?

Add the values of the symbols from left to right. If a smaller symbol appears before a larger one, it is subtracted: IV=4, IX=9, XL=40, XC=90.

Where are Roman numerals used today?

Roman numerals are used to denote centuries (XXI), book chapters, monarchs (Henry VIII), and clock faces.