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Roman Numeral Converter — Arabic & Roman

Convert Arabic numbers and Roman numerals in both directions with auto-detection, range checks from 1 to 3999, and a common Roman numerals reference for dates, chapter numbers, outlines, and study notes.

Common Roman Numerals

I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
MMXXIV = 2024

How to Use Roman Numeral Converter Both Ways

Quick Start Guide

1

Choose Arabic to Roman, Roman to Arabic, or auto-detect mode.

2

Enter a number from 1 to 3999 or a valid Roman numeral.

3

Run the conversion and review the result with the reference list.

4

Copy the converted value for labels, outlines, dates, or study notes.

Frequently Asked Questions

It supports the standard range from 1 to 3999, which covers the most common Roman numeral use cases.
Yes. Auto Detect mode accepts either Arabic numbers or Roman numerals and converts to the opposite format.
The tool validates standard Roman numeral order, so malformed strings or unsupported combinations are rejected.
Yes. It works well for dates, book sections, outlines, headings, and educational examples within the supported range.

Still have questions? Check out our other tools or contact us for support.

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