Roman numeral converter

Turn numbers into Roman numerals and Roman numerals back into numbers. Free, no signup.

Roman numerals — quick guide

The letters

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

Range

Standard Roman numerals cover 1 to 3999.