Roman Numeral Converter

Numbers to Roman numerals and back — 1 to 3999, validated both ways.

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

Mode

Number → Roman Roman → Number

Result

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How to use it

Pick a direction — Number to Roman or Roman to Number — type your value, and the result appears instantly. The converter validates as you type, so an invalid number or an incorrectly-formed numeral is flagged rather than mis-converted.

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A Roman numeral converter turns an ordinary number into Roman numerals (like 1994 to MCMXCIV) and converts Roman numerals back to a number. It covers 1 to 3999 — the standard range — and validates the numeral both ways so malformed input like IIII is rejected. It runs in your browser.

How Roman numerals work

Seven symbols — I (1), V (5), X (10), L (50), C (100), D (500), M (1000) — combine additively, with subtractive pairs like IV (4) and CM (900). The standard system represents 1 to 3999; there is no zero and no single symbol for 5000+, which is why converters cap at 3999.

FAQ

What range does it support?The standard 1 to 3999. Roman numerals have no zero and no compact way to write 4000 or more.

Does it validate the numerals?Yes — it round-trips the conversion, so malformed numerals like IIII or IC are rejected as invalid.

Is it case sensitive?No — you can type Roman numerals in lower or upper case; the output is uppercase.