What does MCMXLVI mean?

MCMXLVI is the Roman numeral for 1,946 — 1000 + 900 + 40 + 5 + 1.

How do you write 1946 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: M (1000), then CM (900), then XL (40), then V (5), then I (1). That gives MCMXLVI.

1,946 in Roman numerals

MCMXLVI

Number (1–3,999 for numerals)

Roman numeral

1,946 is written MCMXLVI in Roman numerals. That is 5 symbol groups added together, reading left to right from the largest value down.

How it breaks down

MCMXLVI = 1000 + 900 + 40 + 5 + 1 = 1,946
Group	Value	Subtraction	Running total
M	1,000	—	1,000
CM	900	M − C	1,900
XL	40	L − X	1,940
V	5	—	1,945
I	1	—	1,946

Why the smaller symbol comes first

MCMXLVI uses subtractive notation in 2 places: CM means M minus C, or 900; 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 — 1×
V	5	yes — 1×
X	10	yes — 1×
L	50	yes — 1×
C	100	yes — 1×
D	500	no
M	1,000	yes — 2×

The same number, other ways

In words: One thousand nine hundred forty-six
Roman numeral: MCMXLVI
Symbol count: 7 characters
Binary: 11110011010
Hexadecimal: 79A

The numbers either side

Number	Roman numeral
1,944	MCMXLIV
1,945	MCMXLV
1,946	MCMXLVI ←
1,947	MCMXLVII
1,948	MCMXLVIII

Common questions

What is 1946 in Roman numerals?: 1,946 is MCMXLVI.
What does MCMXLVI mean?: MCMXLVI is the Roman numeral for 1,946 — 1000 + 900 + 40 + 5 + 1.
How do you write 1946 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: M (1000), then CM (900), then XL (40), then V (5), then I (1). That gives MCMXLVI.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked