Number Systems
Roman Numeral Converter
Convert numbers to Roman numerals and back. Supports values from 1 to 3,999,999.
Current Year
MMXXVI
2026
Today's Date in Roman Numerals
XXV.VI.MMXXVI
Number to Roman
Roman to Number
Your Birth Year in Roman Numerals
Roman Numeral Rules
I
1
V
5
X
10
L
50
C
100
D
500
M
1,000
Additive principle: Symbols are added together from left to right. VII = 5 + 1 + 1 = 7.
Subtractive notation: A smaller symbol before a larger one means subtraction. IV = 5 - 1 = 4, IX = 10 - 1 = 9, XL = 50 - 10 = 40, XC = 100 - 10 = 90, CD = 500 - 100 = 400, CM = 1000 - 100 = 900.
Repetition: A symbol can be repeated up to 3 times. III = 3 but 4 is written as IV, not IIII.
Extended notation: For numbers above 3,999, an overline (vinculum) multiplies by 1,000. VĖ = 5,000.