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ToolKit Pro

Roman Numeral Converter Online Free

Convert between Arabic numbers and Roman numerals instantly. Supports 1 to 3999.

Roman Numeral Symbols

SymbolValue
I1
V5
X10
L50
C100
D500
M1000

Subtractive Notation Rules

When a smaller value precedes a larger one, it is subtracted. For example: IV = 4 (5-1), IX = 9 (10-1), XL = 40, XC = 90, CD = 400, CM = 900.

Frequently Asked Questions

What is the largest Roman numeral?

The standard system goes up to MMMCMXCIX (3999). For larger numbers, a bar over a numeral multiplies it by 1000.