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One's Complement Calculator

Add the number and click on the 'Calculate' button to find its one’s (1’s) complement.

Input Format:

Decimal

Binary

Hex

Decimal Number Range = -127 to 127

Decimal

No. of Binary Digits:

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One's Complement Calculator

This 1’s complement calculator helps to find the complement of 1’s for the decimal, binary, or hex numbers system. Convert the numbers from these systems to their equivalent one complement by flipping all the bits i.e., 0’s to 1’s and 1’s to 0’s.

What is One's Complement?

One's Complement is a value that is calculated by inverting bits in the signed binary representation of the given number.

Symbol for One's Complement:

One complement of a number is represented as ‘~’ which is also known as the bitwise operator.

How to Find One’s Complement?

You can calculate 1’s complement of a binary numeral by two methods:

2.1 Manual Calculations

Convert the given number (decimal or hex) to its equivalent binary form
Invert all the bits in the calculated binary number to find the one’s complement

2.2 Calculate Online

Access our “One’s Complement Calculator” and start calculation for 1’s complement frequently by only adding numbers.

Solved Examples (Ones Complement):

Example 01:

Find the binary to one’s complement representation for the given number: (1010001010111)₂

Solution:

Step 01: Write the given number

(1010001010111)₂

Step 02: Find 1’s Complement

Invert all the bits in the number i.e., 0’s to 1’s and 1’s to 0’s

(1010001010111)₂ = (0101110101000)₂

Example 2:

Calculate the 16-bit 1’s complement of the given decimal number: 123

Solution:

Step 01: Convert the given decimal number to the binary form

123 ÷ 2

Sub-steps:

123 ÷ 2 = 61, remainder 1
61 ÷ 2 = 30, remainder 1
30 ÷ 2 = 15, remainder 0
15 ÷ 2 = 7, remainder 1
7 ÷ 2 = 3, remainder 1
3 ÷ 2 = 1, remainder 1
1 ÷ 2 = 0, remainder 1

Step 02: Write all remainders starting from the bottom and ending at the top in the format “Left to Right”

(1111011)₂

Step 03: Find one’s complement

Flip all the bits in the above number

(1111011)₂ = (0000100)₂

Step 04: Write the calculated complement value as a 16-bit representation

(0000000000000100)₂

Example 3:

Convert the hexadecimal number ‘FA’ to 1’s complement notation:

Solution:

Step 01: Write the Binary Equivalent of the Given Numbers

F = (15)₂ = (1111)₂

A = (10)₂ = (1010)₂

Step 02: Invert All Bits to Find One’s Complement

(1010)₂ = (0101)₂

One's Complement Table

Decimal, Binary, 1's Complement, and Hexadecimal Equivalents

Decimal	Binary	1's Complement	Hexadecimal
1	0001	1110	1
2	0010	1101	2
3	0011	1100	3
4	0100	1011	4
5	0101	1010	5
6	0110	1001	6
7	0111	1000	7
8	1000	0111	8
9	1001	0110	9
10	1010	0101	A
11	1011	0100	B
12	1100	0011	C
13	1101	0010	D
14	1110	0001	E
15	1111	0000	F
16	10000	01111	10
17	10001	01110	11
18	10010	01101	12
19	10011	01100	13
20	10100	01011	14
21	10101	01010	15
22	10110	01001	16
23	10111	01000	17
24	11000	00111	18
25	11001	00110	19
26	11010	00101	1A
27	11011	00100	1B
28	11100	00011	1C
29	11101	00010	1D
30	11110	00001	1E
31	11111	00000	1F
32	100000	011111	20
33	100001	011110	21
34	100010	011101	22
35	100011	011100	23
36	100100	011011	24
37	100101	011010	25
38	100110	011001	26
39	100111	011000	27
40	101000	010111	28
41	101001	010110	29
42	101010	010101	2A
43	101011	010100	2B
44	101100	010011	2C
45	101101	010010	2D
46	101110	010001	2E