What does CDLXXIII mean?

CDLXXIII is the Roman numeral for 473 — 400 + 50 + 10 + 10 + 1 + 1 + 1.

How do you write 473 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: CD (400), then L (50), then X (10), then X (10), then I (1), then I (1), then I (1). That gives CDLXXIII.

473 in Roman numerals

CDLXXIII

Number (1–3,999 for numerals)

Roman numeral

473 is written CDLXXIII in Roman numerals. That is 7 symbol groups added together, reading left to right from the largest value down.

How it breaks down

CDLXXIII = 400 + 50 + 10 + 10 + 1 + 1 + 1 = 473
Group	Value	Subtraction	Running total
CD	400	D − C	400
L	50	—	450
X	10	—	460
X	10	—	470
I	1	—	471
I	1	—	472
I	1	—	473

Why the smaller symbol comes first

CDLXXIII uses subtractive notation in one place: CD means D minus C, or 400. 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 — 2×
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 seventy-three
Roman numeral: CDLXXIII
Symbol count: 8 characters
Binary: 111011001
Hexadecimal: 1D9

The numbers either side

Number	Roman numeral
471	CDLXXI
472	CDLXXII
473	CDLXXIII ←
474	CDLXXIV
475	CDLXXV

Common questions

What is 473 in Roman numerals?: 473 is CDLXXIII.
What does CDLXXIII mean?: CDLXXIII is the Roman numeral for 473 — 400 + 50 + 10 + 10 + 1 + 1 + 1.
How do you write 473 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: CD (400), then L (50), then X (10), then X (10), then I (1), then I (1), then I (1). That gives CDLXXIII.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked