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Roman Numeral

Roman numeral reference

Symbol	Value	Symbol	Value
I	1	L	50
IV	4	XC	90
V	5	C	100
IX	9	CD	400
X	10	D	500
XL	40	CM	900
—	—	M	1,000

About the Roman Numeral Converter

Roman numerals use seven letters — I, V, X, L, C, D, M — to represent numbers. Developed by the Romans, the system used subtractive notation: a smaller symbol before a larger one is subtracted (IV = 4, IX = 9). Roman numerals remained the dominant numeral system in Europe until Arabic numerals became widespread in the 13th-15th centuries. They are still used today for clock faces, film sequels, Olympic editions, and regnal numbers.

Roman numeral values and rules

Values — I=1, V=5, X=10, L=50, C=100, D=500, M=1000
Repetition — I, X, C, M can repeat up to 3 times. V, L, D cannot repeat.
Subtractive pairs — only six combinations: IV(4), IX(9), XL(40), XC(90), CD(400), CM(900)
Maximum — standard notation reaches MMMCMXCIX (3,999)

Roman numerals in use today

Clock faces (XII, not 12), book prefaces and front matter (page viii), film sequels (Rocky II, Star Wars Episode V), Super Bowl editions (Super Bowl LVIX), movie copyright dates, regnal numbers (King Charles III), and the Olympics. The year 2025 in Roman numerals is MMXXV.

Roman numerals in design and print

Roman numerals have specific design connotations: authority, tradition, formality, and timelessness. They appear in logo design (Super Bowl LVIX), luxury brand dating (Rolex dial engravings), architectural cornerstones, and monumental inscriptions. In typography, lowercase roman numerals (i, ii, iii) are used for front matter page numbers in books to distinguish them from main content pages.

Book front matter — preface, table of contents, and acknowledgements are conventionally paginated with lowercase roman numerals
Architectural inscriptions — dates on buildings, monuments, and cornerstones often use Roman numerals for gravitas
Film credits — copyright years in end credits: © MMXXV
Watches and clocks — many watch faces use IIII (not IV) for 4 o'clock; this is the traditional clock-face convention

Frequently Asked Questions

How do you write 2025 in Roman numerals?

MMXXV. Breakdown: MM = 2000, XX = 20, V = 5. Each M adds 1000, each X adds 10, V adds 5. Add left to right: 1000 + 1000 + 10 + 10 + 5 = 2025.

What is the subtractive notation rule in Roman numerals?

When a smaller-value symbol appears before a larger one, it is subtracted. Only six combinations are valid: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900). The subtracting symbol must be a power of ten (I, X, or C). You cannot write IC for 99 — it must be XCIX.

What is the largest number in standard Roman numerals?

MMMCMXCIX = 3,999. The letter M can repeat at most 3 times, so 4,000 cannot be written in standard notation. For larger numbers, historical manuscripts used a vinculum (bar over a letter) to multiply by 1,000, but this is rare in modern use.

Where are Roman numerals still used today?

Clock faces (XII for noon, IIII traditionally for 4 o'clock), chapter and front matter numbering in books, film sequels and series (Part II, Episode V), Super Bowl numbers, Olympic games, movie copyright dates in credits, and monarchs' regnal numbers (Elizabeth II, Charles III).

How do I convert 1999 to Roman numerals?

Work from the largest denomination down: 1000 = M, 900 = CM, 90 = XC, 9 = IX. Result: MCMXCIX. The subtractive notation makes 900 = CM (C before M), 90 = XC (X before C), and 9 = IX (I before X).