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Hexadecimal to Binary, Octal, and Decimal Number Systems Conversion

In this tutorial, we will learn about the conversion of hexadecimal to binary, octal, and decimal number systems conversion with the help of examples. By Saurabh Gupta Last updated : May 10, 2023

Prerequisite: Number systems

1. Hexadecimal to Binary Number System Conversion

To convert hexadecimal numbers into binary numbers, we can use the relationship between hexadecimal and binary numbers.

Decimal	Hexadecimal	Binary
0	0	0000
1	1	0001
2	2	0010
3	3	0011
4	4	0100
5	5	0101
6	6	0110
7	7	0111
8	8	1000
9	9	1001
10	A	1010
11	B	1011
12	C	1100
13	D	1101
14	E	1110
15	F	1111

Example 1: Convert (7A.2C)₁₆ into ( ? )₂

Solution

Using the table provided above, we can replace hexadecimal numbers with their equivalent binary digits.

Therefore, (7A.2C)₁₆ = (0111 1010.0010 1100)₂

Example 2: Convert (D2A.2B7)₁₆ into ( ? )₂

Solution

Using the table provided above, we can replace hexadecimal numbers with their equivalent binary digits.

Therefore, (D2A.2B7)₁₆ = (1101 0010 1010.0010 1011 0111)₂

Example 3: Convert (FF18.5E5)₁₆ into ( ? )₂

Solution

Using the table provided above, we can replace hexadecimal numbers with their equivalent binary digits.

Therefore, (FF18.5E5)₁₆ = (1111 1111 0001 1000. 0101 1110 0101)₂

2. Hexadecimal to Octal Number System Conversion

Conversion of the hexadecimal number to octal number can be done using a certain definite path. We first have to convert hexadecimal numbers to a binary number and then convert a binary number into octal number i.e., Hexadecimal Number → Binary Number → Octal Number

Example 1: Convert (1D.E)₁₆ into ( ? )₈

Solution

Step 1: Converting the first hexadecimal number into a binary number. Thus, (1D.E)₁₆ = (0001 1101.1110)₂

Step 2: Now, converting the binary number into an octal number which gives (00011101.1110)₂ = (35.7)₈

Therefore, (1D. E)₁₆ = (35.7)₈

Note: To know how to convert binary number into octal number? Read: conversion of Binary number system to octal number system.

Example 2: Convert (3B.4)₁₆ into ( ? )₈

Solution

Step 1: Converting the first hexadecimal number into a binary number. Thus, (3B.4)₁₆ = (0011 1011.0100)₂

Step 2: Now, converting the binary number into an octal number which gives (0011 1011.0100)₂ = (73.20)₈

Therefore, (3B.4)₁₆ = (73.20)₈

3. Hexadecimal to Decimal Number System Conversion

Conversion of hexadecimal number into a decimal number can be done using the positional weights by multiplying the positional weights with the corresponding bit and add them all together to obtain the decimal number.

In an integral part of the hexadecimal number, the weights follow the pattern as 16⁰, 16¹, 16², 16³, 16⁴, 16⁵ and so on from right to left.

In the fractional part of the hexadecimal number, the weights follow the pattern as 16^-1, 16^-2, 16^-3, 16^-4, 16^-5 and so on from left to right.

Only thing to be kept in mind is A = 10, B = 11, C = 12, D = 13, E = 14, F = 15.

Example 1: Convert (75.3)₁₆ into ( ? )₁₀

Solution

    (75.3)16    = 7 * 161 + 5 * 160 + 3 * 16-1
                = 112 + 5 + 0.1875 = (117.1875)10

We multiply each bit with the corresponding positional weight and then add them together to get the result.

Therefore, (75.3)₁₆ = (117.1875)₁₀

Example 2: Convert (CD3.B70A)₁₆ into ( ? )₁₀

Solution

    (CD3.B70A)16    = C*162 + D*161 + 3*160 + B*16-1 + 7*16-2 + 0*16-3 + A*16-4
                    = 12*256 + 13*16 + 3*1 + 11/16 + 7/256 + 0 + 10/65536
                    = 3072+ 208 + 3 + 0.6875 + 0.0273 + 0.0001
                    = (3283.7149)10

We multiply each bit with the corresponding positional weight and then add them together to get the result.

Therefore, (CD3.B70A)₁₆ = (3283.7149)₁₀

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