Roman Numerals Converter

💡 Type a number (1–3999) or a Roman numeral — conversion is instant. Click any example below to try it, or use the swap button to flip directions.

123 Number → Roman

Enter a number from 1 to 3,999

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XIV Roman → Number

Enter Roman numerals (e.g. XIV, MMXXIV)

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Quick Examples click to convert

Symbol Reference

How Roman Numerals Work

Roman numerals use 7 symbols: I (1), V (5), X (10), L (50), C (100), D (500), M (1000).
Symbols are generally written largest to smallest, left to right, and their values are added together.
Subtractive notation: a smaller symbol before a larger one means subtraction — IV = 4 (5−1), IX = 9 (10−1), XL = 40, XC = 90, CD = 400, CM = 900.
No symbol may be repeated more than three times consecutively (e.g. III = 3, but 4 is IV not IIII).
The symbols V, L, and D are never repeated.
This converter supports numbers from 1 to 3,999 — the traditional range covered by standard Roman numeral rules.