Roman Numeral Converter
Translate between ancient Roman symbols and modern standard numbers.
| Symbol | Value |
|---|---|
| I | 1 |
| IV | 4 |
| V | 5 |
| IX | 9 |
| X | 10 |
| Symbol | Value |
|---|---|
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1,000 |
Roman Numeral Converter
Whether it's the year on a building cornerstone, a movie copyright date, a Super Bowl number, or a tattoo idea — Roman numerals show up everywhere. This converter translates any number to Roman numerals and back, instantly.
What Does This Converter Do?
Enter an Arabic number (1–3,999) and get the Roman numeral equivalent. Or enter Roman numerals and get the Arabic number. The converter explains the breakdown so you can learn the system as you go.
How to Use This Converter
- To convert a number to Roman numerals: enter any whole number from 1 to 3,999.
- To convert Roman numerals to a number: type in the Roman numeral string (e.g., MMXXIV).
- Click Convert to see the result and step-by-step breakdown.
Roman Numeral System
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1,000 |
Subtractive Notation Rules
- I before V (IV) = 4; I before X (IX) = 9
- X before L (XL) = 40; X before C (XC) = 90
- C before D (CD) = 400; C before M (CM) = 900
Example Conversions
- 2024 = MMXXIV (MM + XX + IV)
- 1999 = MCMXCIX (M + CM + XC + IX)
- 42 = XLII (XL + II)
- XIV = 14 (10 + 4)
Why Use This Converter?
Roman numerals appear in clock faces, movie credits, book chapters, legal documents, and monuments. Understanding them — and being able to convert them quickly — is a useful everyday skill.
Common Mistakes to Avoid
- Repeating a symbol more than 3 times — I, X, C, and M can appear up to 3 times consecutively. V, L, and D cannot be repeated.
- Subtracting the wrong symbol — only I, X, and C can be used in subtractive notation. You can't write VX for 5; use IV = 4 and then add what's needed.
- Mixing up the order — always write from largest to smallest value, unless using a subtractive pair.
Frequently Asked Questions
What year is MCMXCIX?
MCMXCIX = M (1000) + CM (900) + XC (90) + IX (9) = 1999.
Why do Roman numerals go up to 3,999?
The standard Roman numeral system tops out at 3,999 (MMMCMXCIX) because there's no symbol for 5,000. Ancient Romans used an overline above a numeral to indicate × 1,000, but this isn't supported by standard Unicode.
What Roman numeral is used for the Super Bowl?
Each Super Bowl uses the Roman numeral for its number. Super Bowl LVIII was the 58th game. Super Bowl LIX is the 59th.
Is there a zero in Roman numerals?
No. Roman numerals have no symbol for zero. Zero as a number was introduced separately through Hindu-Arabic mathematics.
How do I write the current year in Roman numerals?
2026 = MMXXVI. Just enter the year in the converter above to get an instant result.
Conclusion
Roman numerals are ancient, but they're far from obsolete. From movie releases to clock faces to chapter headings, knowing how to read and write them is still a handy skill. Use this converter whenever you need a quick translation.
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