Number to Roman Numerals
Convert a whole number into Roman numerals. Enter any number from 1 to 3999 and the Roman numeral updates instantly.
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About Number to Roman Numerals
Roman numerals use the letters I, V, X, L, C, D, and M to write numbers. This tool converts an ordinary number into the correct Roman numeral, following the standard subtractive rules so 4 becomes IV and 9 becomes IX.
It is useful for clock faces, book chapters, movie sequel numbers, dates on buildings, and anywhere Roman numerals are used for style.
How to Use
- Type a whole number from 1 to 3999.
- Read the Roman numeral in the output box.
- Click Copy to copy the result.
- Use the Roman Numerals to Number tool to convert back.
Frequently Asked Questions
What is the largest number I can convert?
Standard Roman numerals go up to 3999, written as MMMCMXCIX. Beyond that requires special notation that is rarely used.
How are 4 and 9 written?
Roman numerals use subtraction for these, so 4 is IV and 9 is IX rather than IIII and VIIII.
Is the tool private?
Yes. The conversion runs in your browser and nothing is uploaded.
About Matt George
I'm Matt George, a software engineer in the startup space. I run my own shop building software for early-stage founders, and I love making free tools and experiences that people actually use. Enjoy using Number to Roman Numerals!