Roman Numeral Converter
Enter a value to convert.
About this Roman numeral converter
This free Roman numeral converter changes ordinary numbers into Roman numerals and Roman numerals back into numbers. It supports the standard range from 1 to 3999 and follows the proper rules, including subtractive notation such as IV for four and IX for nine. It is handy for schoolwork, clock faces, book chapters, movie sequels, dates on buildings, and tattoos.
Switch the direction with the menu: enter a number to get its Roman numeral, or enter a Roman numeral to get the number. The converter checks that Roman numerals are written correctly and tells you if something is invalid. Everything runs in your browser.
How to use it
Choose a direction, type your value, and read the converted result instantly.
Frequently asked questions
What range of numbers is supported?
Standard Roman numerals cover 1 to 3999, so this converter supports that whole range in both directions.
Can it convert Roman numerals back to numbers?
Yes. Switch the mode to convert a Roman numeral like XIV back into the number 14.
How is 4 written in Roman numerals?
Four is written as IV, using subtractive notation. The converter follows the standard rules automatically.