What is hexadecimal? - Definition from WhatIs.com
Part of the Mathematics glossary:

Hexadecimal describes a base-16 number system. That is, it describes a numbering system containing 16 sequential numbers as base units (including 0) before adding a new position for the next number. (Note that we're using "16" here as a decimal number to explain a number that would be "10" in hexadecimal.) The hexadecimal numbers are 0-9 and then use the letters A-F. We show the equivalence of binary, decimal, and hexadecimal numbers in the table below.

Hexadecimal is a convenient way to express binary numbers in modern computers in which a byte is almost always defined as containing eight binary digits. When showing the contents of computer storage (for example, when getting a core dump of storage in order to debug a new computer program or when expressing a string of text characters or a string of binary values in coding a program or HTML page), one hexadecimal digit can represent the arrangement of four binary digits. Two hexadecimal digits can represent eight binary digits, or a byte.

BinaryDecimalHexadecimal
000
111
1022
1133
10044
10155
11066
11177
100088
100199
101010A
101111B
110012C
110113D
111014E
111115F
100001610
100011711
etcetcetc

This was last updated in September 2005
Posted by: Margaret Rouse

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