How to use the Roman Numeral Converter
- Type a number (1–3,999) or a Roman numeral.
- The other box fills in automatically.
- Read the breakdown to see how it’s built.
About this tool
Roman numerals use seven letters: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1000. A smaller letter before a larger one is subtracted (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900); otherwise values are added. A letter is never repeated more than three times in a row in the standard form.
You’ll see them on clock faces, book chapters, movie sequels, monarchs’ names and film copyright years. The converter rejects non-standard forms like IIII or VX so you get the correct modern version.
Frequently asked questions
What is 2026 in Roman numerals?
MMXXVI — MM (2000) + XX (20) + VI (6).
Why is there no zero?
The Roman system had no symbol for zero; numerals start at I (1).
How are numbers above 3,999 written?
Historically with a bar over a letter to multiply it by 1,000 (V̄ = 5,000). That isn’t part of the standard form supported here.