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Roman Numeral Converter
Convert between Roman numerals and integers instantly. Supports numbers 1 to 3999. Type in either field and see real-time conversion.
Quick Reference
1 = I4 = IV5 = V9 = IX10 = X40 = XL50 = L90 = XC100 = C400 = CD500 = D900 = CM1000 = M2024 = MMXXIV3999 = MMMCMXCIX
Frequently Asked Questions
What is the range?
Roman numerals support integers from 1 to 3999. Numbers outside this range cannot be represented in standard Roman numeral notation.
What do the letters mean?
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive notation is used for 4 (IV), 9 (IX), 40 (XL), 90 (XC), 400 (CD), 900 (CM).
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How to Use
- 1 Enter an integer (1-3999) to convert to Roman numerals.
- 2 Or enter a Roman numeral string to convert to an integer.
- 3 Both fields update in real time as you type.