Roman Numeral Converter

Convert between numbers and Roman numerals. Free, no signup.

Number (1–3999)

Roman numeral

How It Works

Type a number to see its Roman numeral equivalent, or type a Roman numeral to convert it to a number. Both directions update instantly. Supports numbers from 1 to 3,999.

Roman Numeral Reference

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.