Number to Roman numeral converter
Convert any Arabic number from 1 to 3,999 to its Roman numeral equivalent in real time. Type a number and the Roman numeral appears immediately. The converter validates the range and shows an error for numbers outside 1–3,999. All conversion runs locally in your browser.
How it works
To convert a number to Roman numerals, the tool repeatedly subtracts the largest possible Roman numeral value from the number and appends the corresponding symbol (including subtractive pairs like IV=4, IX=9, XL=40, XC=90, CD=400, CM=900). To convert Roman numerals to a number, each character is mapped to its value; a character is subtracted if the next character has a greater value. All processing runs in JavaScript in your browser.
Processing runs in your browser
All conversions happen locally in your browser tab. Our servers are not involved at any point.
Related operations
For working with fractional or mixed numbers, try the fraction calculator. To convert numbers between binary, hex, and decimal, use the number base converter. For unit conversions like inches to centimetres, see the unit converter.
Frequently asked questions
- How do you convert a number to Roman numerals?
- Break the number into thousands, hundreds, tens, and ones. Map each part to the appropriate Roman numeral sequence. For example, 2024: 2000=MM, 0=, 20=XX, 4=IV, so 2024=MMXXIV.
- What is 2024 in Roman numerals?
- 2024 is MMXXIV. MM=2000, XX=20, IV=4.
- What is 1000 in Roman numerals?
- 1000 is M. 2000 is MM, 3000 is MMM. The letter M derives from the Latin word mille, meaning thousand.
- Is my data sent to a server?
- All conversions are pure JavaScript running in your browser. No data is sent to our servers.