Roman Numeral Converter

Numbers to Roman numerals and back.

Roman Numeral Converter is a free online tool to numbers to Roman numerals and back. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.

How to use Roman Numeral Converter

The Roman Numeral Converter turns numbers (1–3999) into Roman numerals and decodes Roman numerals back into numbers, validating the input. Great for dates, names and tattoos. Free and runs in your browser.

Read the full guide: Roman Numeral Converter (Free) - Numbers to Roman

1Choose Number → Roman or Roman → Number.
2Enter your value.
3Copy the converted result.

Both directions

Encode numbers to numerals or decode numerals to numbers.

Validated

Flags invalid numerals so you get correct results.

Free & private

Runs on your device with no sign-up.

Decode a movie copyright year

Film credits, building cornerstones, and book editions print the year in Roman numerals like MMXXIV. Paste it into the Roman to Number mode and instantly read it as 2024. The same trick works for Super Bowl numbers, World War clock faces, monarch names, and any inscription where you just want to know the year or figure without counting symbols by hand.

Turn a date into a tattoo

Planning a tattoo, ring engraving, or wedding monogram with a meaningful date? Switch to Number to Roman, type the year, month, or day, and copy the clean uppercase result like MMXV. Because it uses standard subtractive notation (IV, IX, XL), you get the exact form an engraver or artist expects, with no risk of an awkward IIII slipping into your design.

Check Roman numeral homework

Studying the rules or grading practice problems? Enter a numeral and the tool confirms whether it is written correctly, flagging anything non-standard as Invalid numeral because it only accepts the canonical form. That makes it ideal for verifying that VL, IIII, or XXXX are wrong, and for double-checking answers between 1 and 3999 when you are learning the additive and subtractive patterns.