Roman Numeral Converter
Convert numbers to Roman numerals and back.
How to Use Roman Numeral Converter
Choose Number → Roman or Roman → Number
Enter a value or pick a preset
Copy the converted result
Your files never leave your browser
No upload wait time. Results in seconds
No daily limits, no file count limits
No account, no subscription, no fees
About Roman Numerals
Roman numerals originated in ancient Rome and are still used today in clocks, movie titles, book chapters, and formal numbering. This converter handles both directions — decimal to Roman and Roman to decimal — for values 1 through 3999.
Frequently Asked Questions
What is the range?
Standard Roman numerals represent numbers from 1 to 3999. Numbers outside this range cannot be expressed in traditional Roman notation.
What are the basic Roman numerals?
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive notation: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900.