What does MCXLIX mean?

MCXLIX is the Roman numeral for 1,149 — 1000 + 100 + 40 + 9.

How do you write 1149 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: M (1000), then C (100), then XL (40), then IX (9). That gives MCXLIX.

1,149 in Roman numerals

MCXLIX

Number (1–3,999 for numerals)

Roman numeral

1,149 is written MCXLIX in Roman numerals. That is 4 symbol groups added together, reading left to right from the largest value down.

How it breaks down

MCXLIX = 1000 + 100 + 40 + 9 = 1,149
Group	Value	Subtraction	Running total
M	1,000	—	1,000
C	100	—	1,100
XL	40	L − X	1,140
IX	9	X − I	1,149

Why the smaller symbol comes first

MCXLIX uses subtractive notation in 2 places: XL means L minus X, or 40; IX means X minus I, or 9. A smaller symbol placed before a larger one is subtracted from it rather than added, which is why IX is nine and not eleven.

Only six such pairs are valid — IV, IX, XL, XC, CD and CM. That restriction is what makes the notation unambiguous: IIII and IC both look like they should work, but neither is standard, and only one spelling of any number is correct.

The symbols

Symbol	Value	Used here
I	1	yes — 1×
V	5	no
X	10	yes — 2×
L	50	yes — 1×
C	100	yes — 1×
D	500	no
M	1,000	yes — 1×

The same number, other ways

In words: One thousand one hundred forty-nine
Roman numeral: MCXLIX
Symbol count: 6 characters
Binary: 10001111101
Hexadecimal: 47D

The numbers either side

Number	Roman numeral
1,147	MCXLVII
1,148	MCXLVIII
1,149	MCXLIX ←
1,150	MCL
1,151	MCLI

Common questions

What is 1149 in Roman numerals?: 1,149 is MCXLIX.
What does MCXLIX mean?: MCXLIX is the Roman numeral for 1,149 — 1000 + 100 + 40 + 9.
How do you write 1149 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: M (1000), then C (100), then XL (40), then IX (9). That gives MCXLIX.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked