Roman Numerals Converter
Category: Unit and Number Tools
Updated on: February 22, 2026
Convert numbers to Roman numerals and Roman numerals back to numbers quickly and securely.
About the Tool
The Roman Numerals Converter allows you to instantly convert numbers into Roman numerals and vice versa. It supports values from 1 up to 3999, ensuring accuracy for the classical Roman numeral system.
Features
- Instant conversion of integers (1–3999) to Roman numerals.
- Reverse conversion of Roman numerals to integers.
- Validation of Roman numeral input to prevent errors.
- Works entirely in your browser – no data sent to server.
- One-click copy of the result.
- Clear input/output fields with a single click.
How to Use
- Enter a number (e.g., 2025) or a Roman numeral (e.g., MMXXV) into the input field.
- Click Convert to Roman to convert a number into Roman numerals.
- Click Convert to Number to convert a Roman numeral into an integer.
- The result will appear in the output box.
- Use the Copy button to copy the result to your clipboard.
- Click Clear to reset both fields.
Example
Input: 1987 → Output: MCMLXXXVII
Input: XLII → Output: 42