Roman Numeral Converter

Roman Numeral Converter – Translate Numbers & Roman Numerals

Instantly convert standard decimal numbers to Roman numerals and vice versa. Learn the ancient numeric system used by the Romans, perfect for understanding dates on monuments, clock faces, and movie copyright years.

Two-Way Conversion

Type in either box to convert seamlessly between Decimal (Arabic) numbers and Roman Numerals.

Instant Accuracy

Correctly handles complex subtraction rules (like IV for 4 and IX for 9) automatically.

Educational

Great for students learning history or math. See how numbers translate instantly.

How Roman Numerals Work

Roman numerals originate from ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. The system uses combinations of letters from the Latin alphabet to signify values.

Basic Values

Symbol	Value	Example
I	1	III = 3
V	5	VII = 7
X	10	XX = 20
L	50	LXXX = 80
C	100	CCC = 300
D	500	DCC = 700
M	1000	MM = 2000

The Rules

Addition: When a symbol appears after a larger (or equal) symbol, it is added.
Example: VI = 5 + 1 = 6.
Subtraction: When a symbol appears before a larger symbol, it is subtracted.
Example: IV = 5 - 1 = 4.
No Repeats: Symbols V, L, and D are never repeated. I, X, C, and M can be repeated up to three times in a row.

Frequently Asked Questions

What is the year 2024 in Roman Numerals?

The year 2024 is written as MMXXIV. (MM = 2000, XX = 20, IV = 4).

Is there a Roman Numeral for zero?

No, the Romans did not have a symbol for zero. The concept of zero as a number didn't reach Europe until much later.

What is the largest Roman Numeral?

In standard notation (without special bars for multiplication), the largest number is 3,999 (MMMCMXCIX).