MCXL is the Roman numeral for 1,140 — 1000 + 100 + 40.

How do you write 1140 in Roman numerals?

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

1,140 in Roman numerals

MCXL

Number (1–3,999 for numerals)

Roman numeral

1,140 is written MCXL in Roman numerals. That is 3 symbol groups added together, reading left to right from the largest value down.

How it breaks down

MCXL = 1000 + 100 + 40 = 1,140
Group	Value	Subtraction	Running total
M	1,000	—	1,000
C	100	—	1,100
XL	40	L − X	1,140

Why the smaller symbol comes first

MCXL 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	no
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
Roman numeral: MCXL
Symbol count: 4 characters
Binary: 10001110100
Hexadecimal: 474

The numbers either side

Number	Roman numeral
1,138	MCXXXVIII
1,139	MCXXXIX
1,140	MCXL ←
1,141	MCXLI
1,142	MCXLII

Common questions

What is 1140 in Roman numerals?: 1,140 is MCXL.
What does MCXL mean?: MCXL is the Roman numeral for 1,140 — 1000 + 100 + 40.
How do you write 1140 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: M (1000), then C (100), then XL (40). That gives MCXL.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked