Roman Numeral Converter
Convert between Roman numerals and decimal numbers. Enter a Roman numeral (I, V, X, L, C, D, M) or a number to convert.
Conversion Results
Roman Numeral
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Decimal Number
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Why use this tool?
Roman numerals are still used today in various contexts such as clock faces, book chapters, movie credits, and historical dates. This tool makes it easy to convert between Roman numerals and modern decimal numbers.
- Two-way conversion — Convert Roman numerals to numbers and numbers to Roman numerals.
- Validation — Validates proper Roman numeral forms.
- Range support — Supports numbers from 1 to 3999.
- Privacy-focused — All processing happens in your browser. Your data never touches a server.
- Free and unlimited — No sign-up, no limits, no ads.
How to use
- Enter a Roman numeral (I, V, X, L, C, D, M) or a decimal number into the input field.
- Click Convert to see the conversion result.
- The tool automatically detects whether you entered a Roman numeral or a number.
- Click the copy icon next to any result, or use Copy Result to copy the output.
Frequently Asked Questions
Yes, the MushTools Roman Numeral Converter is completely free with no sign-up required.
This tool supports Roman numerals from 1 to 3999, which is the standard range for traditional Roman numeral notation.
No. Everything runs client-side in your browser. Your data never leaves your device.