Roman Numeral
Roman numerals originated in ancient Rome and remain widely used today — clock faces, book chapters, movie release years, building cornerstone dates. This tool auto-detects and converts between Arabic numbers (1-3999) and Roman numerals in both directions — enter either format and get the other instantly.
Includes a quick reference chart (I=1, V=5, X=10, L=50, C=100, D=500, M=1000) and conversion rules. Real-time conversion as you type; double-click to copy.
Current Year
2026 = MMXXVI
Reference Chart
I
1
V
5
X
10
L
50
C
100
D
500
M
1000
📖 Roman Numeral Converter Guide
Introduction
Roman numerals originated in ancient Rome and are still used today in clocks, book chapters, movie release years, and more. This tool converts between Arabic and Roman numerals (1-3999) in both directions.
Features
- Bi-directional: Auto-detect and convert between Arabic and Roman
- Real-time: Results update as you type
- Copy on double-click
- Reference chart: I/V/X/L/C/D/M values at a glance
How to Use
- Enter an Arabic number (e.g. 2024) or Roman numeral (e.g. MMXXIV)
- The tool auto-detects and converts both ways
- Both formats are displayed simultaneously
- Double-click any result to copy
Example
Arabic → Roman:
1 → I 4 → IV 9 → IX
40 → XL 90 → XC 100 → C
400 → CD 500 → D 900 → CM
1000 → M
2024 → MMXXIV
1999 → MCMXCIX
Use Cases
- Book cataloging and chapter numbering
- Learning Roman numerals
- Historical document interpretation
- Design and typography