Roman Numeral Converter
Convert decimals to Roman numerals or Roman numerals back to numbers. Includes standard-notation validation, numeral breakdowns, and quick reference help.
Convert any whole number from 1 to 3999 into standard Roman numerals.
Roman numeral result
MCMXCIV
Breakdown
1994 = M + CM + XC + IV = MCMXCIV
Quick Reference
| Roman numeral | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Common Conversions
Year 2024
2024 = MMXXIV
Year 1999
1999 = MCMXCIX
Super Bowl 58
58 = LVIII
100 years
100 = C
500 milestone
500 = D
1000 milestone
1000 = M
How to Use
- Choose Number to Roman or Roman to Number.
- Enter a whole number from 1 to 3999, or type a Roman numeral using I, V, X, L, C, D, and M.
- Review the converted result instantly, then copy it with one click if needed.
- Use the breakdown, quick reference table, and common examples to double-check your answer.
Frequently Asked Questions
What is the largest Roman numeral this converter supports?
This converter supports standard Roman numerals from 1 to 3999. That covers values from I to MMMCMXCIX, which is the most common modern range for Roman numeral converters.
Why is 4 written as IV instead of IIII?
Standard Roman numerals use subtractive notation for certain values. IV means 5 minus 1, IX means 10 minus 1, XL means 50 minus 10, and so on. This is the standard style used in most educational and modern reference materials.
How do I know if a Roman numeral is valid?
A valid Roman numeral follows standard ordering and subtraction rules. For example, I can come before V or X, but not before L or C. This converter checks the numeral and suggests the correct standard form when the input is not valid.
Where are Roman numerals still used today?
Roman numerals are still common in book chapters, movie sequels, clocks, outlines, major events like the Super Bowl, and year markings on monuments or buildings.