Roman Numeral Converter
Convert between Roman numerals and Arabic numbers instantly. Supports values from 1 to 3999 with round-trip validation. Free and instant.
Enter a value above to convert
Convert between Arabic numbers and Roman numerals (I, V, X, L, C, D, M)
Roman Numeral Reference
I1
V5
X10
L50
C100
D500
M1000
Ctrl+Enter to runCtrl+Shift+C to copy
Learn More
Roman Numeral Converter: Rules, Conversion, and Common Uses
Convert between Roman and Arabic numerals. Learn the rules, subtractive notation, and where Roman numerals are still used.
What Are Roman Numerals?
Roman numerals are a numeral system originating in ancient Rome, using combinations of letters from the Latin alphabet to represent values. The system uses seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are formed by combining these symbols using additive and subtractive notation.
5 min readRead full guide