Roman Numeral Converter
Arabic ↔ Roman numerals
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Reference Table
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
Quick guide
What can Roman Numeral Converter help you do?
Free Roman numeral ↔ Arabic number converter. Supports 1 to 3999.
Best for
Useful for quick file work, text cleanup, calculations, content creation, and website or AI checks.
How to use it
Open the tool, enter or upload what it asks for, then copy or download the result directly.
Privacy and limits
Most tools run in your browser with no sign-in. Very large files or older devices may hit browser memory limits.
Frequently Asked Questions
How to read Roman numerals?
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive: IV=4, IX=9, XL=40.
Max value is 3999?
Standard Roman numerals max at MMMCMXCIX (3999). Larger requires special notation.