DownloadKaro · Free online tool

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals back to numbers (1–3999), with instant validation.

Use Roman Numeral Converter now — free ↗

How to use it

1. Type a number (1–3999) to see its Roman numeral, or
2. Type a Roman numeral like MMXXVI to see its number.
3. Both convert live as you type.

Why use this tool

• Two-way conversion with validation of wrong numerals
• Handy for book chapters, outlines, clocks and class work
• Quick reference table for the seven symbols

Common questions

Why does it stop at 3999?

Standard Roman numerals have no symbol above M (1000) without extra notation, so 3999 (MMMCMXCIX) is the normal maximum.

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