Roman Numeral Converter
Convert between numbers and Roman numerals, both directions.
How to use the roman numeral converter
- Choose a direction: Number to Roman, or Roman to Number.
- Enter a value and see the converted result instantly.
Convert any whole number from 1 to 3999 into Roman numerals, or convert a Roman numeral back into a regular number. Comes up for clock faces, book chapters, and Super Bowl numbering.
How Roman numerals work
Roman numerals use seven letters: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1000. You usually add the values from left to right, so VIII = 8 and LX = 60.
When a smaller value comes before a larger one, it's subtracted instead: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400 and CM = 900. So 2024 is MMXXIV (2000 + 20 + 4). Roman numerals are still used for years in film credits, clock faces, book chapters and Super Bowl numbers.
Frequently asked questions
What's the largest number this can convert?
Standard Roman numerals go up to 3999 (MMMCMXCIX). Larger numbers require special notation not commonly used today.
Why does an invalid Roman numeral show no result?
The converter validates that the Roman numeral follows standard formatting rules (like using canonical subtractive notation) before converting it back to a number.
How do you write the year 2026 in Roman numerals?
MMXXVI: MM = 2000, XX = 20 and VI = 6.
Is there a Roman numeral for zero?
No. The Roman system has no symbol for zero, so conversions start at 1.