What does MCXLIII mean?

MCXLIII is the Roman numeral for 1,143 — 1000 + 100 + 40 + 1 + 1 + 1.

How do you write 1143 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: M (1000), then C (100), then XL (40), then I (1), then I (1), then I (1). That gives MCXLIII.

1,143 in Roman numerals

MCXLIII

Number (1–3,999 for numerals)

Roman numeral

1,143 is written MCXLIII in Roman numerals. That is 6 symbol groups added together, reading left to right from the largest value down.

How it breaks down

MCXLIII = 1000 + 100 + 40 + 1 + 1 + 1 = 1,143
Group	Value	Subtraction	Running total
M	1,000	—	1,000
C	100	—	1,100
XL	40	L − X	1,140
I	1	—	1,141
I	1	—	1,142
I	1	—	1,143

Why the smaller symbol comes first

MCXLIII uses subtractive notation in one place: XL means L minus X, or 40. 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 — 3×
V	5	no
X	10	yes — 1×
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-three
Roman numeral: MCXLIII
Symbol count: 7 characters
Binary: 10001110111
Hexadecimal: 477

The numbers either side

Number	Roman numeral
1,141	MCXLI
1,142	MCXLII
1,143	MCXLIII ←
1,144	MCXLIV
1,145	MCXLV

Common questions

What is 1143 in Roman numerals?: 1,143 is MCXLIII.
What does MCXLIII mean?: MCXLIII is the Roman numeral for 1,143 — 1000 + 100 + 40 + 1 + 1 + 1.
How do you write 1143 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: M (1000), then C (100), then XL (40), then I (1), then I (1), then I (1). That gives MCXLIII.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked