Roman Numeral Converter

Roman numerals are a numeral system that originated in ancient Rome and remained the standard way of writing numbers throughout Europe well into the Late Middle Ages. They use seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are formed by combining these symbols and adding or subtracting their values. A smaller symbol placed before a larger one means subtraction (IV = 4), while a smaller symbol after a larger one means addition (VI = 6).

The Roman numeral system developed without a concept of zero because it was designed for counting physical objects rather than for abstract mathematics. The Romans used the Latin word "nulla" (meaning "none") when they needed to express the concept of zero, but this was not a numerical symbol. The modern concept of zero as a placeholder came to Europe from Indian and Arabic mathematics around the 12th century, eventually replacing the Roman system for most practical calculations.

In the standard Roman numeral system used today, the largest number is 3999, written as MMMCMXCIX. This is because the largest single symbol is M (1000), and repeating a symbol more than three times is not permitted in standard notation. Historical Romans did use additional notations for larger numbers — such as a bar over a symbol to multiply it by 1000 — but these are not part of the modern standard system this converter uses.