Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers. Supports values 1 to 3,999.
I
1
V
5
X
10
L
50
C
100
D
500
M
1000
Free Roman Numeral Converter
Convert between standard numbers and Roman numerals instantly. Enter a number (1–3,999) to see its Roman numeral equivalent, or enter a Roman numeral to get the decimal number. The tool includes a reference chart showing all seven Roman numeral symbols and their values.
Roman Numeral Rules
Roman numerals use seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numerals are typically written largest to smallest from left to right. When a smaller numeral appears before a larger one, it is subtracted: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900. The maximum standard Roman numeral is 3,999 (MMMCMXCIX).