Roman Numeral Converter
Numbers to Roman numerals.
Numbers to Roman numerals.
How to use Roman Numeral Converter
- Type a whole number from 1 to 3999
- Read its Roman numeral, converted live as you type
- Enter a Roman numeral instead to decode its value
About Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers, both at the same time. Type any whole number from 1 to 3999 to see its numeral, or type a numeral to read its value; the two fields update live and independently. It accepts standard subtractive notation, ignores capitalization and spacing, and flags out-of-range numbers and malformed numerals right away, so turning an Arabic number like 2026 into MMXXVI — or checking one you already have — takes a second.
Because a date is just three whole numbers, you can use it to build a Roman numeral date for a birthday, anniversary, or tattoo: convert the day, the month, and the year separately, then join them with dots or slashes, so 4, 7 and 1998 become IV·VII·MCMXCVIII. The same trick decodes the year at the end of a film or TV show, where the numerals are simply the production year. If you just need the building blocks, the symbols are I, V, X, L, C, D and M (1, 5, 10, 50, 100, 500 and 1000), and the tool will spell out any value in between on demand. To see every numeral at once, use the printable Roman numerals chart: 1 to 1000, the years 1900–2099, the rules, and worksheets with answer keys.
It is completely free with no sign-up, no limits, and nothing to install. Everything runs in your browser in plain JavaScript, so whatever you type never leaves your device and it keeps working offline once the page has loaded.
Frequently asked questions
- Is the Roman numeral converter free to use?
- Yes, it is completely free with no account, sign-up, or usage limits. You can convert as many numbers and numerals as you like.
- Is my data uploaded to a server?
- No. All conversion happens locally in your browser with JavaScript. Nothing you type is sent, stored, or logged anywhere, so it works even offline once the page has loaded.
- What range of numbers can it convert?
- Standard Roman numerals cover 1 to 3999. There is no zero and no simple symbol for 4000 or above, so numbers outside 1–3999 are rejected with a clear message.
- How do I convert Arabic numbers to Roman numerals?
- Arabic numerals are the ordinary digits you write every day, like 4, 42, or 2026. Type one into the number field and it returns the Roman form instantly, so 2026 becomes MMXXVI. It works for any whole number from 1 to 3999.
- How do I convert a birthday or date to Roman numerals?
- A date is three separate whole numbers, so convert the day, the month, and the year one at a time, then join the results. For 4 July 1998 you would convert 4 to IV, 7 to VII, and 1998 to MCMXCVIII, then arrange them as IV·VII·MCMXCVIII (day·month·year) or VII·IV·MCMXCVIII (month·day·year). Pick whichever order matches the date format you want.
- Can I use this for a Roman numeral tattoo?
- Yes — it is a popular way to plan a Roman numeral date tattoo. Break your date into day, month, and year, convert each number here, then assemble them with dots, dashes, or slashes between the parts. Because a tattoo is permanent, paste each numeral back into the converter to confirm it returns the number you expect before you commit.
- How do I convert a year to a Roman numeral?
- A year within 1 to 3999 is just a number, so type it in to get its numeral — 1984 is MCMLXXXIV and 2026 is MMXXVI. To go the other way, enter the numeral to read the year back.
- Can it convert Roman numerals back to numbers?
- Yes. It is a two-way converter: enter a number to get its numeral, or enter a numeral like MMXXVI to get the number. Both fields update instantly and independently.
- What are the Roman numeral symbols, and is there a chart?
- The seven symbols are I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, and M = 1000, and larger numbers combine them from left to right. Yes, there is a chart: the printable Roman numerals chart (linked in the About section above) lists every numeral from 1 to 1000 and every year from 1900 to 2099, with the rules and practice worksheets. To check a single value, enter it here and see exactly how it is built, which is handy for the subtractive cases like 4 (IV), 9 (IX), 40 (XL), and 90 (XC).
- Why is a numeral like IIII or IC marked invalid?
- The tool only accepts the standard subtractive form used today. Four is written IV (not IIII) and ninety-nine is XCIX (not IC), so non-standard spellings are flagged as invalid.
- Does capitalization or spacing matter when I enter a numeral?
- No. Lowercase letters are treated the same as uppercase and spaces are ignored, so 'mmxxvi' and 'MM XX VI' both read as 2026.
- How do I read the Roman numeral year at the end of a film or TV show?
- The numerals in a movie or TV copyright line are just the production year — type them into the converter to decode them. For example MCMXCIX is 1999, MMXIV is 2014, and MMXXVI is 2026. As a quick guide, a numeral starting MCM… is in the 1900s and one starting MM… is in the 2000s.