What does CDXLVI mean?

CDXLVI is the Roman numeral for 446 — 400 + 40 + 5 + 1.

How do you write 446 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: CD (400), then XL (40), then V (5), then I (1). That gives CDXLVI.

446 in Roman numerals

CDXLVI

Number (1–3,999 for numerals)

Roman numeral

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

How it breaks down

CDXLVI = 400 + 40 + 5 + 1 = 446
Group	Value	Subtraction	Running total
CD	400	D − C	400
XL	40	L − X	440
V	5	—	445
I	1	—	446

Why the smaller symbol comes first

CDXLVI uses subtractive notation in 2 places: CD means D minus C, or 400; 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	yes — 1×
M	1,000	no

The same number, other ways

In words: Four hundred forty-six
Roman numeral: CDXLVI
Symbol count: 6 characters
Binary: 110111110
Hexadecimal: 1BE

The numbers either side

Number	Roman numeral
444	CDXLIV
445	CDXLV
446	CDXLVI ←
447	CDXLVII
448	CDXLVIII

Common questions

What is 446 in Roman numerals?: 446 is CDXLVI.
What does CDXLVI mean?: CDXLVI is the Roman numeral for 446 — 400 + 40 + 5 + 1.
How do you write 446 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: CD (400), then XL (40), then V (5), then I (1). That gives CDXLVI.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked