Roman Numeral Converter
Convert between numbers (1-3999) and Roman numerals with step-by-step explanations. Validate Roman numerals and view your conversion history. All calculations happen locally — nothing leaves your browser.
How to Use the Roman Numeral Converter
- Choose direction — convert number to Roman, or Roman to number.
- Enter your value — numbers 1-3999, or valid Roman numerals.
- Review steps — see the breakdown of how the conversion works.
- Check history — previous conversions are saved for reference.
Understanding Roman Numerals
Roman numerals use combinations of letters from the Latin alphabet: I (1), V (5), X (10), L (50), C (100), D (500), M (1000). Numbers are formed by combining symbols and adding their values. When a smaller symbol appears before a larger one, it's subtracted (e.g., IV = 4, IX = 9).
The system has no zero and no negative numbers. The largest standard Roman numeral is MMMCMXCIX (3999). Extensions exist for larger numbers using an overline to multiply by 1,000.
Frequently Asked Questions
In standard notation, MMMCMXCIX (3999) is the largest. For larger numbers, Romans used a vinculum (overline) to multiply by 1,000. For example, V = 5,000 and X = 10,000.
No — the Roman numeral system had no concept of zero. The word "nulla" (meaning "nothing") was sometimes used in medieval texts, but it wasn't a formal Roman numeral.
Break the number into place values: 1984 = 1000 + 900 + 80 + 4. Convert each: 1000 = M, 900 = CM, 80 = LXXX, 4 = IV. Combine them: MCMLXXXIV. This tool converts any number up to 3999 to Roman numerals and back automatically.
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