Converters

Roman Numeral Converter

Numbers to Roman numerals and back.

Type an Arabic number (1–3,999,999) or a Roman numeral — the other updates instantly, with a place-value breakdown below.

Number

Roman numeral

Try:

A bar over a numeral (a vinculum, shown here as a combining overline, e.g. V̄ = 5,000) multiplies it by 1,000 for values above 3,999.

Date to Roman numerals

DateFormatSeparator

This free Roman numeral converter translates between ordinary numbers and Roman numerals in both directions. Enter a number to see its Roman form, or type a numeral like MMXXVI to read its value. It follows the standard subtractive rules (IV, IX, XL, XC, CD, CM) and rejects malformed numerals such as IIII or VX with a clear message. Every result comes with a place-value breakdown showing how each part adds up, and large values above 3,999 use vinculum (overline) notation, supported all the way to 3,999,999.

A built-in date converter renders any calendar date in Roman numerals — pick day/month/year order, year-only, and your preferred separator — the way dates appear on cornerstones, film credits, and monuments. Copy any field with one click.

Reference chart

I = 1 · V = 5 · X = 10 · L = 50 · C = 100 · D = 500 · M = 1,000
IV = 4 · IX = 9 · XL = 40 · XC = 90 · CD = 400 · CM = 900
V̄ = 5,000 · X̄ = 10,000 · L̄ = 50,000 · C̄ = 100,000 · M̄ = 1,000,000