Roman Numeral Converter

How to convert Roman numerals

Convert any integer to Roman numerals or decode any Roman numeral string back to a number — bidirectional, up to 3,999,999.

1. 01

   Choose conversion direction

   Select either 'Number to Roman' or 'Roman to Number' mode. The tool works bidirectionally — convert integers to Roman numerals or decode Roman numerals back to integers.

2. 02

   Enter your value

   For Number to Roman, type any integer from 1 to 3,999,999. For Roman to Number, type a valid Roman numeral string like XIV, MCMXCIX, or MMXXIV.

3. 03

   Read the result instantly

   The converted value appears as you type — no button press needed. The tool validates your input and shows an error if the Roman numeral string is invalid.

4. 04

   Copy the result

   Click the copy button to copy the result to your clipboard. Useful when you need to paste a Roman numeral into a document, design, or code.

What people use it for

Roman numerals appear in more places than you'd expect — from clock faces and film titles to tattoos and academic documents.

Frequently asked questions

Common questions about Roman numeral rules, supported ranges, and how the converter works.