Roman Numeral Converter
Convert any number into Roman numerals instantly, or type a Roman numeral to read it as a number. This free Roman numeral converter handles the full range from 1 to 3999 both ways — computed privately in your browser with nothing uploaded.
What is a Roman numeral converter?
A Roman numeral converter translates between our everyday decimal numbers and the numeral system the Romans used for centuries. That system is built on just seven symbols: I for 1, V for 5, X for 10, L for 50, C for 100, D for 500 and M for 1000. Numbers are written by combining and repeating these symbols, usually from largest to smallest, with a subtractive trick that keeps them compact: a smaller symbol written before a larger one takes away its value, so IV is 4, IX is 9, XL is 40 and CM is 900.
Converting is useful far beyond history class. Roman numerals still appear on movie release years, clock faces, copyright lines, monarch and pope names, sporting events like the Super Bowl, and the outlines of formal documents. The converter works both ways, so you can turn 2024 into MMXXIV or decode MCMXCIV back into 1994 without doing the arithmetic in your head. It supports the full traditional range of 1 to 3999 and runs entirely on your device.
How to use the Roman numeral converter
- Choose a direction in the first dropdown — number to Roman, or Roman to number.
- Type your whole number (1–3999) or a Roman numeral into the value box.
- The result appears instantly. Click Copy result to put it on your clipboard.
Example
Type 1994 with the direction set to "Number → Roman numeral" and you get MCMXCIV. Switch to "Roman numeral → Number" and paste MCMXCIV to get 1994 back. Try 3999 in the first direction for the largest standard value, MMMCMXCIX.
Common use cases
- Decoding the Roman-numeral year on a movie poster, building facade or monument.
- Numbering chapters and sections of formal documents and outlines.
- Checking the copyright year printed at the bottom of a photo or website.
- Reading the edition of a sports event, such as the Super Bowl or a film sequel.
Pro tips
- The converter expects the standard subtractive form, so use IV not IIII, and CM not DCCCC.
- A symbol can repeat only three times in a row in standard notation; IIII is invalid while IV is correct.
- Roman numerals are always written from the largest value down, so MCMXCIV reads from 1000 downward.
- This tool stops at 3999 because larger values need a bar over a symbol, which avoids confusion.
FAQ
How does the Roman numeral converter work?
Type a whole number from 1 to 3999 and the converter writes it using the seven Roman symbols I, V, X, L, C, D and M. Switch the direction to paste a Roman numeral and it reads the value back as a number.
What is the largest number that can be written in Roman numerals?
With the standard medieval symbols the largest number expressible is 3999 (MMMCMXCIX). Larger numbers need a bar over a symbol to multiply it by 1000, which this converter does not use.
Why is 4 written as IV and not IIII?
Roman numerals use the subtractive style seen in clocks and modern books: a smaller symbol before a larger one subtracts, so IV is one less than five. IIII was used on some clocks but is not the standard form.
What is the number 1994 in Roman numerals?
1994 is written MCMXCIV. It groups as 1000 (M), 900 (CM), 90 (XC) and 4 (IV), which follows the subtractive rule exactly.
Can I convert decimal numbers or fractions?
No. Roman numerals only represent whole numbers, so decimals and fractions are not supported. The converter rounds the input down to the nearest whole number.
What does the Roman numeral M represent?
M is the Roman symbol for 1000. It comes from the Latin word mille, meaning a thousand, and is the largest of the standard seven symbols.
Is there a zero in Roman numerals?
No. The ancient system had no symbol for zero. The Romans used the word nulla, meaning none, when a place was empty rather than writing a numeral.
Why does the converter limit input to 3999?
Beyond 3999 the standard symbols run out and you would need a vinculum (a bar) to multiply symbols by 1000. To keep results unambiguous it stops at the traditional maximum of 3999.
Is the Roman numeral converter private?
Yes. Everything runs in your browser and nothing you type is sent to a server, so your input never leaves your device.
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