- Open the Roman Numeral Converter and find the main field: Number or Roman numeral.
- Type your values in that field. The placeholder shows an example format (42 or XLII).
- Click "Convert" to compute the result in your browser.
- Read the result in the Result section. Use Copy to paste the output elsewhere.
Roman Numeral Converter
Convert standard integers to Roman numerals and vice versa with this tool.
Calculator
Enter the values described below, then run. Use Load sample to try a prefilled example when available.
Format hints
42 or XLII
How to Use This Tool
Learn More About Roman Numeral Converter
Roman Numerals
Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers are represented by combinations of letters from the Latin alphabet.
Common Roman Numerals
- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000
About
Convert standard integers to Roman numerals and vice versa with this tool. Enter a number (1-3999) to see its Roman numeral equivalent, or enter a Roman numeral to convert it back to an integer.
Examples
Valid number
Number or Roman numeral
Input
1
Output
Shown in the Result area after you click the action button.
Valid number
Number or Roman numeral
Input
3999
Output
Shown in the Result area after you click the action button.
Use Cases
- Converting dates to Roman numerals for inscriptions or tattoos
- Educational purposes for learning about Roman numerals
- Historical research and document analysis
- Creating visually appealing numbering systems for outlines or lists