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Roman Numeral Converter

Convert numbers to Roman numerals and back, with a step-by-step breakdown of each symbol.

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How to use the Roman Numeral Converter

  1. 1

    Type a number or a Roman numeral.

  2. 2

    Read the conversion in the other box.

  3. 3

    See how the numeral breaks down.

Frequently asked questions

What range is supported?

Whole numbers from 1 to 3,999 (MMMCMXCIX), the range standard Roman numerals can write.

Why is IIII not accepted?

Only the standard form is valid, where 4 is IV, 9 is IX, 40 is XL and so on. Non-standard forms are rejected so you always get a correct numeral.