Free Online Roman Numeral Converter

Translate integers to Roman numerals and Roman numerals to numbers.

How to use & benefits of Roman Numeral Converter

Convert Classical Roman & Arabic Numbers

Roman numerals originated in ancient Rome and remained the standard numbering system across Europe throughout the Middle Ages. Standard integers (Arabic numbers) replaced them because arithmetic is easier. However, Roman numerals are still used today on clock faces, building dates, book chapters, and movie copyrights.

Our free online Roman numeral converter handles translations instantly:

Arabic to Roman: Convert standard integers (e.g. 2026) to Roman letters.
Roman to Arabic: Decipher Roman letter strings (e.g. MMXXVI) back to standard integers.

The utility runs locally, converting symbols instantly as you type.

Key Benefits & Features

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Bi-Directional Translations

Translates standard numbers to Roman characters and Roman characters to numbers.

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Input Sanity Filtering

Ignores invalid characters to prevent calculation errors.

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100% Free & Interactive

Provides visual references for standard numerals (I, V, X, L, C, D, M).

How to Use the Roman Numeral Converter Step-by-Step

This utility runs entirely inside your browser using client-side JavaScript. We prioritize your security: none of your inputted text is logged or stored.

1
Select the conversion direction (Arabic to Roman or Roman to Arabic).
2
Enter the standard number or Roman letters into the field.
3
Copy the translated output instantly.

Practical Examples

Input Example

Input: 1984

Expected Output

Roman: MCMLXXXIV

Frequently Asked Questions (FAQ)

What do the Roman numeral letters stand for?▼

The basic symbols are: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000.

What is the subtractive principle?▼

Instead of writing four of the same character (like IIII), Roman numerals subtract a value by putting a smaller letter before a larger one (e.g., IV = 4, IX = 9).

Is there a limit to Roman numbers?▼

Standard Roman numerals represent numbers up to 3,999 (MMMCMXCIX). Modern conventions use overline bars for higher numbers, but this converter covers standard classic numerals.

Explore category: Math & Calculators

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