Roman Numerals Converter

What are Roman Numerals

Roman numerals are a numeral system that originated in ancient Rome and are still used today in various applications. The basic symbols are: I (1), V (5), X (10), L (50), C (100), D (500), M (1000).

Basic Rules of Roman Numeration

• Addition: When a smaller symbol follows a larger one, they are added (VI = 6)
• Subtraction: When a smaller symbol precedes a larger one, it is subtracted (IV = 4)
• Repetition: Symbols I, X, C, M can be repeated up to three times in a row (exception — the letter M in classic notation)
• Limited subtraction: Only I, X, C can precede larger symbols

Popular Roman Numerals and Their Values

The most commonly used Roman numerals in everyday life:

• I = 1
• II = 2
• III = 3
• IV = 4
• V = 5
• VI = 6
• IX = 9
• X = 10
• XX = 20
• L = 50
• C = 100
• CD = 400
• D = 500
• M = 1000
• MCMLIV = 1954
• MMXXVI = 2026

Where Roman Numerals Are Used Today

Roman numerals are still widely used in:

• Clocks: On traditional clock faces
• Movies and books: For numbering volumes, chapters, parts
• Sports: Olympic Games, Super Bowl
• Architecture: Dates on buildings and monuments
• Monarchy: Names of rulers (Elizabeth II)
• Education: Section numbering in documents

How to Convert Complex Roman Numbers

To convert large Roman numbers, follow this algorithm:

1. Break the number into groups of symbols
2. Determine the value of each group
3. Apply addition and subtraction rules
4. Sum all values

Example: MCMXC = M (1000) + CM (900) + XC (90) = 1990

Common Mistakes with Roman Numerals

• Using more than three identical symbols in a row
• Incorrect application of subtraction rules
• Confusion between similar symbols
• Ignoring the order of symbols