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Roman Numeral Converter

Instantly convert between numbers and Roman Numerals.

Number must be between 1 and 3999.
Invalid Roman Numeral.

Basic Symbols

I
1
V
5
X
10
L
50
C
100
D
500
M
1000

How it Works

Roman to Number

Roman numerals use additive and subtractive principles. Symbols are added (e.g., VI = 6) or subtracted (e.g., IV = 4) depending on order.

If a smaller symbol appears before a larger one, subtract it.

Number to Roman

To convert a number, we break it down by value (Thousands, Hundreds, Tens, Ones) and map them to the closest Roman representation.

90 = XC (100 - 10)
4 = IV (5 - 1)
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