BCD

Updated: 04/26/2017 by Computer Hope
binary coded decimal

Short for binary-coded decimal, BCD is also known as packet decimal and is numbers 0 through 9 converted to four-digit binary. Below is a list of the decimal numbers 0 through 9 and the binary conversion.

Decimal BCD
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
8 1000
9 1001

Using this conversion, the number 25, for example, would have a BCD number of 0010 0101 or 00100101. However, in binary, 25 is represented as 11001.

BCD was used in some of the early decimal computers, and the IBM System/360 series systems.

Base, Binary, Computer abbreviations, Decimal