Roman Numeral Reference
I
1
IV
4
V
5
IX
9
X
10
XL
40
L
50
XC
90
C
100
CD
400
D
500
CM
900
M
1000
Smart Online Tools. Simple Solutions.
Smart Online Tools. Simple Solutions.
TextCraft Roman Numeral tool seamlessly converts between Arabic numbers and Roman numerals with complete accuracy. Processing everything locally in your browser, this educational tool ensures your calculations remain private and server-free.
Supporting numbers from 1 to 3999 in standard Roman numeral notation, this bidirectional converter handles both conversions instantly. It is perfect for students learning Roman numerals, historians working with dates, and anyone needing quick numeral conversions.
Convert both from Arabic to Roman numerals and from Roman to Arabic numbers in a single tool.
All conversion logic runs entirely in your browser with zero server communication or data transmission.
Handles all standard Roman numeral combinations up to 3999 following classical notation rules.
Completely free for students, teachers, and anyone learning or working with Roman numeral systems.
Instant validation alerts you to invalid Roman numeral sequences or numbers outside the supported range.
Every TextCraft tool processes your data entirely in your browser — nothing is uploaded to any server. This means your files, text, and personal information stay completely private on your device. Whether you are converting documents, editing images, or generating random data, you can work with confidence knowing your content never leaves your computer.
The converter supports Arabic numbers from 1 to 3,999 and their corresponding Roman numeral representations. This range covers standard Roman numeral notation using I, V, X, L, C, D, and M. Numbers above 3,999 require special notation with vinculum lines or apostrophic symbols, which are not part of the standard classical system this tool supports.
Yes, the converter fully supports standard subtractive notation including IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900). When converting from Roman numerals to Arabic numbers, it correctly interprets these subtractive pairs and produces the accurate numeric value following classical Roman numeral conventions.
The converter accepts both uppercase and lowercase Roman numeral input for maximum flexibility. It normalizes the case internally before processing, so inputs like "xiv" are correctly interpreted as 14 just as "XIV" would be. However, the output always displays Roman numerals in standard uppercase format for consistency and readability.
The validation engine checks for common errors including repeated use of subtractive pairs, incorrect character ordering like "IL" for 49, more than three consecutive identical characters, invalid characters that are not Roman numeral symbols, and out-of-range values. Invalid inputs trigger a clear error message explaining why the numeral is incorrect.
The Roman numeral system developed without a concept of zero, which entered European mathematics later through Arabic numerals. Classical Roman numerals begin at I (1) and have no character or notation for zero. This converter follows historical convention and does not support zero or negative numbers, as they have no place in traditional Roman numeral systems.