What is it?
The Roman Numerals Converter changes numbers to Roman numerals and back, one per line.
Who is it for?
School students learning Roman numerals, people writing years on invitations or certificates, readers decoding film credits, and designers preparing clock faces or chapter numbers.
How to use it
- Type a number such as 2026, or Roman numerals such as MMXXVI, in Numbers or Roman numerals (one per line). You can type a whole list, one per line.
- The tool sees which way to convert and shows the answer under Result as you type.
- Tap Copy result or Download. Clear empties the box.
“Roman numerals go from 1 to 3999”
Standard Roman numerals have no zero and no letter above M (1000), so 3999 (MMMCMXCIX) is the largest. Larger numbers were written with a bar over the letters, which plain text cannot show.
“Not written the standard way”
Each value has one standard form. IIII is understood as 4 but is written IV, and VX should be V. The tool shows the correct form next to the value.
Converting a list
Paste a column of numbers or Roman numerals, one per line. Each line is converted on its own, and you can mix both kinds.
Worked examples
- 2026 = MM (2000) + XX (20) + VI (6) = MMXXVI.
- 1999 = M (1000) + CM (900) + XC (90) + IX (9) = MCMXCIX, not MIM.
- 49 = XL (40) + IX (9) = XLIX, not IL.
The rules in short
- I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000.
- A smaller letter before a bigger one subtracts, but only I before V or X, X before L or C, and C before D or M.
- No letter repeats more than three times in a row (except clock faces, which often show IIII for 4).
Where you’ll meet them
- Copyright years at the end of films (MCMXCV = 1995).
- Chapter and part numbers, book prefaces (i, ii, iii), Super Bowl numbers and monarchs (Henry VIII).
- In Indian school maths, Roman numerals are tested in Class 4–6; use the tool to check homework.
Related: Number to Words
Tool: Roman Numerals Converter
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Questions, or an error not listed here?
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