Roman Numeral Converter - Convert Numbers to Roman Numerals

Convert between decimal numbers and Roman numerals instantly

Converters

Roman Numeral Converter

Value

From unit

How to Use

1Enter a number or Roman numeral in the input field
2Select the conversion direction (decimal to Roman or Roman to decimal)
3Click Calculate to see the result

Frequently Asked Questions

I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive notation: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900.

Standard Roman numerals go up to 3,999 (MMMCMXCIX). Numbers 4,000 and above require non-standard extensions.

Subtractive notation (like IV for 4 instead of IIII) was adopted for brevity and to avoid confusion in written records. It became standardized in medieval Europe.