What is the largest number in Roman numerals?

Using the standard seven symbols, the largest value is 3,999, written MMMCMXCIX.

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11 in Roman Numerals

11 in Roman numerals is written as XI.

Roman numeral

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How 11 breaks down

11 is built by adding these Roman numeral groups together:

X = 10I = 1

Add them up: X + I = 11.

Nearby values

Number	Roman numeral
8	VIII
9	IX
10	X
11	XI
12	XII
13	XIII
14	XIV

How Roman numerals work

Roman numerals use seven letters, each with a fixed value: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, and M = 1000. Numbers are formed by combining these symbols and adding their values, working from the largest to the smallest.

When a smaller symbol appears before a larger one, it is subtracted instead of added — this is the subtractive rule. For example, IV is 4 (5 − 1) and IX is 9 (10 − 1). The same idea gives XL (40), XC (90), CD (400), and CM (900). The same symbol is never repeated more than three times in a row.

Roman numeral reference chart

Symbol	Value
I	1
V	5
X	10
L	50
C	100
D	500
M	1,000

1 = I 2 = II 3 = III 4 = IV 5 = V 10 = X 50 = L 100 = C 500 = D 1000 = M

Frequently asked questions

What is 11 in Roman numerals?: 11 in Roman numerals is XI.
What is the largest number in Roman numerals?: Using the standard seven symbols, the largest value is 3,999, written MMMCMXCIX. Larger numbers historically used a bar over a numeral to multiply it by 1,000.
Is there a Roman numeral for zero?: No. The Roman system has no symbol for zero; the concept of zero came later from Indian mathematics.