CDXXI in Roman Numerals

Here we will show you how to convert numeral CDXXI to numbers.

First, note that Roman Numerals are divided into places just like numbers: ones, tens, hundreds, thousands and so on, as shown in the table below:

#
1
2
3
4
5
6
7
8
9

1000s
M
MM
MMM

100s
C
CC
CCC
CD
D
DC
DCC
DCCC
CM

10s
X
XX
XXX
XL
L
LX
LXX
LXXX
XC

1s
I
II
III
IV
V
VI
VII
VIII
IX

For each place, you have to identify that value. Here is CDXXI color coded and separated, so you can see the different places and how it is constructed:

CD XX I

Use the table above to find the value for each part of CDXXI as follows:

0 1000s = 0
CD = 4
XX = 2
I = 1

Then, simply line up the numbers above in the correct order to get the answer.

Thus, the answer to numeral CDXXI converted to a decimal number is:

421

Roman Numerals to Numbers
Enter another Roman Numeral below to convert to decimal numbers:

CDXXII in Roman Numerals
Here is the next numeral on our list that we have converted to decimal numbers.

The table we used to convert CDXXI to decimal numbers will work for any Roman Numerals.

To learn how to read Roman Numerals such as CDXXI in the future, we recommend that you convert a few more Roman Numerals above and then read our explanations for how we converted them.