Roman Numeral Converter
Convert between Arabic and Roman numerals in the 1–3999 range
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
This tool converts Arabic numerals to Roman numerals and back again, in both directions. It's useful for anyone who needs Roman numerals for clocks, tables of contents, copyright years, or tattoos and designs.
How to use
- Select the 'Number → Roman' or 'Roman → Number' tab.
- Enter the value to convert. (Numbers: 1–3999; Roman numerals: I V X L C D M)
- The result appears immediately, and you can copy it to the clipboard with the copy button.
FAQ
- Why does it only convert up to 3999?
- Standard Roman numerals express up to 3999 using only the basic symbols (I V X L C D M). Values of 4000 and above need special rules like overlines, so this tool doesn't handle them.
- Is something like IIII recognized?
- No. Input that doesn't follow standard notation rules (for example, 4 is IV) is treated as an invalid Roman numeral and shows an explanatory note.
- Is the value I enter sent to a server?
- No. All conversion is processed in your browser, and the numbers and characters you enter are never sent to a server.