How to Convert Hex to Binary and Binary to Hexadecimal
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The Hexadecimal Numbering System
The base 16, hexadecimal (abbreviated to hex) numbering system is regularly used in computer coding for conveniently representing a byte or word of data. This guide shows you how to convert from hex to binary and binary to hexadecimal.
Decimal, the Base 10 Numbering System
Before we learn how to convert hex to binary, let's try and understand how the base 10 system works.
The decimal, denary or base 10 numbering system that we use in everyday life makes use of ten symbols or numerals: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.
So to count you start with 0, then continue 1...2...3...4...5...6...7...8...9
What happens when you get to ten? There's no numeral for ten, so it's represented as
10
Which means 1 ten and no units
Similarly when you get to 99, there's no numeral for one hundred, so you write one hundred as 100.
So writing a number in the base 10 system involves using numerals in a "units", "tens", "hundreds", "thousands" place and so on
So 145 really means "one hundred, 4 tens and 5 units" although we just think of it as one hundred and forty five.
How to Convert Decimal to Binary
This guide shows you how to convert hex to binary. To convert decimal to binary and binary to decimal, see my other guide:
How to Convert Decimal to Binary and Binary to Decimal
Hexadecimal, the Base 16 Numbering System
Hexadecimal or "hex" is a numbering system which uses 16 different numerals. We saw that decimal used ten numerals from 0 to 9. Hex expands on this by adding six more, the capital letters A, B, C, D, E and F.
So to count from 0 to 15 you go 0...1...2...3...4...5...6...7...8...9
But what happens next?
Simply continue with A...B...C...D...E...F which represents 10, 11, 12, 13, 14 and 15 decimal.
In the decimal system, we saw that when we got to nine, there was no numeral for ten so it was represented as 10 or "one ten and no units".
In the hex system when we get to F which is 15 decimal, we have to represent the next number sixteen as 10 or "one 16 and no units".
Binary, the Base 2 Numbering System
The binary system used by computers is based on 2 numerals; 0 and 1. So you count 0, 1, there is no numeral for 2, so 2 is represented by 10 or "one 2 and no units". In the same way that there is a units, tens, hundreds, thousands place in the decimal system, in the binary system there is a units, twos, fours, eights, sixteens place etc. in the binary system.
Decimal to Hex and Binary Table
Decimal
 Hex
 Binary


0
 0
 0

1
 1
 1

2
 2
 10

3
 3
 11

4
 4
 100

5
 5
 101

6
 6
 110

7
 7
 111

8
 8
 1000

9
 9
 1001

10
 A
 1010

11
 B
 1011

12
 C
 1100

13
 D
 1101

14
 E
 1110

15
 F
 1111

16
 10
 10000

17
 11
 10001

18
 12
 10010

19
 13
 10011

20
 14
 10100

...
 ...
 ...

25
 19
 11001

26
 1A
 11010

27
 1B
 11011

28
 1C
 11100

29
 1D
 11101

30
 1E
 11110

31
 1F
 11111

32
 20
 100000

33
 21
 100001

34
 22
 100010

Indicating the Base of a Number
If a number isn't decimal (base 10), the base can be explicitly indicated by a subscript to avoid confusion. Sometimes the subscript is omitted to avoid excessive detail if the base has been specified earlier in a discussion or if numbers are listed in a table (e.g. numbers may be indicated as hex in the title of the table).
So for instance 1F hex (31 decimal) can be written 1F_{16}
Steps to Convert Hex to Binary
Hex is very easy to convert to binary.
 Write down the hex number and represent each hex digit by its binary equivalent number from the table above.
 Use 4 digits and add insignificant leading zeros if the binary number has less than 4 digits. E.g. Write 10_{2 }(2 decimal) as 0010_{2.}
 Then concatenate or string all the digits together.
 Discard any leading zeros at the left of the binary number.
Most Significant Bit (MSB) and Least Significant Bit (LSB)
For a binary number, the most significant bit (MSB) is the digit furthermost to the left of the number and the least significant bit (LSB) is the rightmost digit.
Steps to Convert Binary to Hex
Binary is also easy to convert to hex.
 Start from the least significant bit (LSB) at the right of the binary number and divide it up into groups of 4 digits. (4 digital bits is called a "nibble").
 Convert each group of 4 binary digits to its equivalent hex value (see table above).
 Concatenate the results together, giving the total hex number.
What is Hex Used For?
Because of the ease of converting from hex to binary and vice versa, it's a convenient shorthand for representing byte values i.e. numbers from 0 to 255. Also it's compact requiring only 2 digits for a byte and 4 digits for a word.
 Hex dumps are used to display the values of bytes in files. Each byte value is displayed as hex
 Assembly language is written as a series of mnemonic processor instructions. The operand is commonly specified as a hex value. It's also used to indicate the storage location of data
Example of assembly language instruction
Mov is the opcode and 61 hex is the operand
MOV AL, 61h ; Load AL with 97 decimal (61 hex)
What is Binary Used For?
For more details on how binary is used in computer systems and digital electronics, see my other article:
Questions & Answers
What is the hexadecimal value of 10110?
It's 16.
Helpful 64What is an octal number?
Octal numbers use 8 symbols rather than 10 as in the base 10 or denary system we use for normal counting.
So in octal, we count 0, 1, 2, 3, 4, 5, 6, 7
Eight is represented as 10 because we don't use the symbols 8 and 9
This is like the way ten is represented in the base 10 system by the symbols 1 and 0, i.e. we write ten as 10 because there's no symbol for ten.
Everytime an octal number reaches a power of 8, we add a new place digit.
So 64 is 100 in octal just like one hundred is 100 in the base 10 numbering system
Helpful 20What is a use of octal?
It can be used as a shorter representation of binary (just like hex).
For instance, the number 01011101 can be grouped into groups of three digits (in this case add a lead "0"), The number then becomes 135 octal.
Helpful 11
© 2018 Eugene Brennan
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