What does DCCCIV mean?

DCCCIV is the Roman numeral for 804 — 500 + 100 + 100 + 100 + 4.

How do you write 804 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: D (500), then C (100), then C (100), then C (100), then IV (4). That gives DCCCIV.

804 in Roman numerals

DCCCIV

Number (1–3,999 for numerals)

Roman numeral

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

How it breaks down

DCCCIV = 500 + 100 + 100 + 100 + 4 = 804
Group	Value	Subtraction	Running total
D	500	—	500
C	100	—	600
C	100	—	700
C	100	—	800
IV	4	V − I	804

Why the smaller symbol comes first

DCCCIV uses subtractive notation in one place: IV means V minus I, or 4. 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	no
L	50	no
C	100	yes — 3×
D	500	yes — 1×
M	1,000	no

The same number, other ways

In words: Eight hundred four
Roman numeral: DCCCIV
Symbol count: 6 characters
Binary: 1100100100
Hexadecimal: 324

The numbers either side

Number	Roman numeral
802	DCCCII
803	DCCCIII
804	DCCCIV ←
805	DCCCV
806	DCCCVI

Common questions

What is 804 in Roman numerals?: 804 is DCCCIV.
What does DCCCIV mean?: DCCCIV is the Roman numeral for 804 — 500 + 100 + 100 + 100 + 4.
How do you write 804 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: D (500), then C (100), then C (100), then C (100), then IV (4). That gives DCCCIV.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked