How to use the Roman Numeral Converter
Enter the number or Roman numeral and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
The formula
Subtractive notation: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900.
Examples
- The year 2026
MMXXVI
- The number 49
XLIX
- The number 3999 (largest standard numeral)
MMMCMXCIX
Limitations and assumptions
Standard numerals from 1 to 3999.
Frequently asked questions
What are the seven Roman numeral symbols?
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1,000.
Why is 4 written IV and not IIII?
Standard rules use subtraction: a smaller symbol before a larger one is subtracted, so IV is 5 minus 1. Some clock faces still show IIII by tradition.
What is the largest Roman numeral?
Standard notation stops at 3,999 (MMMCMXCIX) because there is no symbol above M and a symbol repeats at most three times in a row.
How do I write the current year?
Enter the year above. For 2026 the result is MMXXVI.