Roman Numeral Converter: Numbers, Years and Dates (Free)

This free Roman numeral converter turns any number from 1 to 3999 into Roman numerals and back, with a breakdown of how each one is built. It also converts dates, so you can write a birthday, wedding date or year in Roman numerals for a tattoo, a clock face, an invitation or a film credit.

Number (1 to 3999)

Roman numeral

Date to Roman numerals

Date

Format

Separator

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Quick answer: Type a number to get its Roman numeral, or type Roman numerals to get the number. 2026 in Roman numerals is MMXXVI (1000 + 1000 + 10 + 10 + 5 + 1). Use the date box to turn a full date into Roman numerals.

How Roman numerals work

Roman numerals use seven letters:

I = 1, V = 5, X = 10, L = 50
C = 100, D = 500, M = 1000

Write the values from largest to smallest and add them up: XVI = 10 + 5 + 1 = 16. To avoid four of the same letter in a row, a smaller letter placed before a larger one is subtracted. Only six of these pairs are used:

IV = 4 and IX = 9
XL = 40 and XC = 90
CD = 400 and CM = 900

So 1999 is not “MIM” but MCMXCIX: M (1000) + CM (900) + XC (90) + IX (9). The converter flags numerals like “IIII” or “IC” that break these rules and shows the standard form.

Roman numerals chart

Number	Roman	Number	Roman
1	I	14	XIV
2	II	15	XV
3	III	19	XIX
4	IV	20	XX
5	V	40	XL
6	VI	50	L
7	VII	90	XC
8	VIII	100	C
9	IX	400	CD
10	X	500	D
11	XI	900	CM
12	XII	1000	M

Roman numerals for years

1999 = MCMXCIX
2000 = MM
2024 = MMXXIV
2025 = MMXXV
2026 = MMXXVI
2027 = MMXXVII

Film credits, building cornerstones and the Super Bowl all use Roman numeral years. The Super Bowl in February 2026 was Super Bowl LX, the 60th.

How to write a date in Roman numerals

Convert the day, month and year separately and join them with dots, dashes or spaces. In the US order (month, day, year), October 13, 2026 becomes X.XIII.MMXXVI. Pick the order that matches how dates are written where you live: the US puts the month first, while the UK, India and most of Europe put the day first. Double-check dates for tattoos and engravings with the converter above; it’s easy to swap the day and month.

FAQ

What is the largest Roman numeral?

With standard letters, 3999 (MMMCMXCIX). Romans wrote bigger numbers by drawing a line over a numeral to multiply it by 1,000, but that notation is rarely used today.

Is there a Roman numeral for zero?

No. The Roman system had no zero. Medieval writers sometimes used the word “nulla” (none) instead.

Why do some clocks show IIII instead of IV?

Many clock and watch makers use IIII for 4 by tradition, partly because it balances the VIII on the other side of the dial. IV is still the standard form.