Decimal to Roman Numerals Converter [2024]
Convert decimal numbers to Roman numerals with support for large numbers. Extended notation supports values up to 3,999,999 with bar notation.
Understanding Roman Numerals
Basic Symbols
- •
Standard Numerals
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)
- •
Repetition Rules
Maximum three consecutive identical symbols
Extended Notation
- •
Bar Notation
M̄ (1,000,000), D̄ (500,000), C̄ (100,000)
- •
Large Numbers
Support for numbers up to 3,999,999
- •
Font Support
Bar notation requires compatible font rendering
Usage Examples
Standard Numbers
- • 1994 → MCMXCIV
- • 2024 → MMXXIV
- • 3999 → MMMCMXCIX
- • 444 → CDXLIV
- • 999 → CMXCIX
Large Numbers
- • 4,000 → ĪV̄
- • 10,000 → X̄
- • 100,000 → C̄
- • 500,000 → D̄
- • 1,000,000 → M̄
Frequently Asked Questions
What's the largest number supported?
With large number support enabled, you can convert numbers up to 3,999,999. Without it, the maximum is 3,999 (standard Roman numeral limit).
What is bar notation?
Bar notation (vinculum) places a line over Roman numerals to multiply their value by 1,000. For example, V̄ represents 5,000.
Why don't some fonts show the bars correctly?
Bar notation uses Unicode combining characters which aren't supported by all fonts. For best results, use modern Unicode-compliant fonts.
Can Roman numerals represent zero or negative numbers?
No, the Roman numeral system doesn't have symbols for zero or negative numbers. It only represents positive integers.
More Text Tools
Character Count
Count characters in text
Emoji Remover
Remove emojis from any text
Extract Text From HTML
Extract plain text from HTML
Find And Replace
Find and replace text in your content
HTML Escape
Escape HTML special characters
HTML Unescape
Unescape HTML special characters
JSON Escape
Escape JSON content
JSON Unescape
Unescape JSON content
Line Count
Count lines in text
Markdown Editor
Write and preview Markdown content
Sentence Count
Count sentences in text
Shuffle Letters
Randomly shuffle letters in text
Shuffle Text Lines
Randomly shuffle lines of text
Sort List
Sort text lines alphabetically
Split Text
Split text by custom delimiter
String Difference Checker
Compare and find differences between strings
Text Diff Checker
Compare text and find differences
Text Lowercase
Convert text to lowercase
Text Repeater
Repeat text multiple times
Text Rotator
Rotate text left or right
Text Uppercase
Convert text to uppercase
URL Parser
Parse and analyze URLs
Word Count
Count words in text