Roman Numeral Converter
Convert any number from 1 to 3999 into Roman numerals, or decode numerals like MMXXVI back into numbers. Includes live validation, so you'll know if a numeral isn't written correctly.
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1,000
How to use
- Type a number (1–3999) or a Roman numeral (like XIV).
- The conversion appears instantly in the other field.
- Copy the result with one click.
Frequently asked questions
Standard Roman numerals have no symbol beyond M (1000), and numbers above 3999 need overline notation that doesn't type well as plain text.
Yes — invalid sequences like 'IIII' or 'VX' are flagged instead of being silently misread.