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Roman to Hex Converter

Convert Roman numerals to hexadecimal numbers instantly. Perfect for developers, educators, and students working with classical notation and modern number systems.

Range: I to MMMCMXCIX (1-3999)
Quick examples:

Your hexadecimal result will appear here...
Roman:
→
Decimal:
→
Hex:

📜 Roman Numeral Reference

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

💡 How to Use This Tool

Convert any Roman numeral to hexadecimal in seconds. Follow these simple steps:

1

Enter Roman Numeral

Type or paste your Roman numeral. Values from I to MMMCMXCIX (1-3999) are supported.

2

Choose Options

Select uppercase/lowercase output and whether to include the 0x prefix.

3

Click Convert

Press the "Convert to Hex" button or hit Enter to convert.

4

Copy Result

Click "Copy" to copy the hexadecimal result to your clipboard.

📖 About Roman to Hex Converter

What is Roman to Hex Conversion?

Roman to Hex conversion is a two-step process that first converts a Roman numeral to decimal, then converts that decimal to hexadecimal (base-16). This is useful for translating classical notation into modern computing formats.

How the Conversion Works

Step 1: Roman to Decimal Each Roman numeral symbol is converted to its decimal value:

  • I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
  • Subtractive notation: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900

Step 2: Decimal to Hex The decimal number is converted to hexadecimal using division by 16, with remainders forming the hex digits (0-9, A-F).

Example: Roman 'CCLV' = 255 decimal = FF (15×16 + 15)

Common Use Cases

  • Educational: Teaching number systems and historical notation
  • Programming: Converting classical references to hex values
  • Historical Research: Digitizing Roman numerical data
  • Data Conversion: Transforming legacy notation to modern formats
  • Games & Design: Converting Roman-styled data to hex codes

Valid Roman Numerals

Roman numerals can represent positive integers from 1 to 3,999 (I to MMMCMXCIX). The converter validates input for proper Roman numeral syntax and subtractive combinations.

Privacy & Security

This tool runs entirely in your browser using JavaScript. Your data is never sent to any server—all conversion happens locally on your device.

❓ Frequently Asked Questions

Yes! All conversion happens locally in your browser using JavaScript. Your data never leaves your device and is not sent to any server.
Valid Roman numerals use the symbols I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Subtractive combinations like IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900) are also valid.
Standard Roman numerals can represent numbers from 1 to 3,999 (I to MMMCMXCIX). This corresponds to hex values from 1 to F9F.
Yes! The converter automatically converts lowercase input to uppercase before processing. You can enter "mcmxcix" or "MCMXCIX" and both will work correctly.
You can choose between uppercase (FF) or lowercase (ff) hex output, and optionally include the 0x prefix commonly used in programming languages.