Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals back to numbers.

Number (1–3999)

Roman numeral

How to use

Type a number (1–3999) to get its Roman numeral.
Or type a Roman numeral to get the number.
The other field updates as you type.

Frequently asked questions

What range is supported?

Standard Roman numerals cover 1 to 3999 (I to MMMCMXCIX). There is no symbol for zero or negative numbers.

How do Roman numerals work?

Letters (I, V, X, L, C, D, M) are added together, except when a smaller value precedes a larger one (like IV = 4), where it is subtracted.

🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.

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