Converts decimal numbers to Roman numerals using the standard notation (I, V, X, L, C, D, M). Supports values from 1 to 3999 — the traditional range of Roman numerals without extended notation. Uses subtractive notation (IV for 4, IX for 9, etc.) for compact results.
Decimal to Roman Numeral Converter
Convert numbers into Roman numeral notation
How to decimal to roman numerals
- 1.Enter a decimal number between 1 and 3999.
- 2.The Roman numeral equivalent appears instantly.
- 3.All other number base equivalents are also shown.
- 4.Click Copy next to the Roman numeral to use it.
About This Tool
Frequently Asked Questions
Standard Roman numerals represent values from 1 (I) to 3999 (MMMCMXCIX). Values above 3999 require extended notation with overlines, which is not part of this tool.
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000. Subtractive pairs: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900.
Clock faces, movie copyright dates, book chapters, Super Bowl numbering, monarch names (Elizabeth II), and formal outlines.