NUMBER TOOL · CLIENT-SIDE
Roman Numeral Converter
Convert between Arabic numbers (1–3999) and Roman numerals. See the step-by-step breakdown of each conversion.
Convert
Conversion Steps
Why it matters
Roman numerals appear on clocks, book chapters, Super Bowl logos, movie credits, and monarch names. Understanding the system helps you read dates on buildings, parse outlines, and appreciate classical references.
Roman numeral symbols
Base symbols
I = 1, V = 5, X = 10. The foundation of the system.
Mid-range symbols
L = 50, C = 100, D = 500. Used for larger values.
Largest symbol
M = 1000. Repeated up to 3 times for 3000.
Frequently Asked Questions
What numbers can I convert to Roman numerals?
This tool converts Arabic numbers from 1 to 3999. Roman numerals traditionally do not have symbols for zero or negative numbers, and 3999 (MMMCMXCIX) is the largest number representable with standard Roman notation.
How do Roman numerals work?
Roman numerals use seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), M (1000). Numbers are formed by combining symbols, with subtractive notation used for 4 (IV), 9 (IX), 40 (XL), 90 (XC), 400 (CD), and 900 (CM).
Can I convert Roman numerals back to Arabic numbers?
Yes. Type a Roman numeral in the bottom field and the Arabic number appears above. The tool validates input and highlights any invalid characters.