Roman Numeral Converter
Convert ordinary numbers to Roman numerals and back, from 1 to 3999.
Reviewed by the WorldCalcs team · Methodology · Last reviewed: June 2026
Result
MMXXVI
What is a Roman numeral converter?
A Roman numeral converter changes ordinary numbers into Roman numerals and back. Romans used letters - I, V, X, L, C, D and M - to write numbers, a system still seen on clocks, book chapters and movie dates.
How it works
Each letter has a value (I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000). Values are added left to right, except when a smaller letter comes before a larger one, which means subtraction (IV = 4, IX = 9). Example: 2026 is MMXXVI. Standard Roman numerals cover 1 to 3999.
All calculations happen in your browser. Nothing is sent, stored, or tracked.
Results are estimates and may contain errors — for general information only, not professional advice. Always verify before relying on them. Disclaimer
How to use
Choose the direction — number to Roman numeral, or Roman numeral to number — then enter your value. The converter updates instantly. It supports standard subtractive notation (IV, IX, XL, XC, CD, CM).
Standard Roman numerals cover the range 1 to 3999.