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One's Complement Calculator

Input the binary number in the one’s (1’s) complement calculator and hit the ‘calculate’ button.

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Ones complement calculator is an online tool for converting binary numbers into 1's complement. It finds the complement of a given binary number.

This calculator also provides a comprehensive step-wise process of finding 1s complement. You can enter up to 8-bit binary numbers.

Note: Do not add space between digits of 8-bit numbers.

What is one’s complement?

One’s complement can be defined as the inverse of a binary number. By inverse, it does not mean to add negative signs like decimal numbers (e.g inverse of 4 is -4).

In binary numbers since there are only 2 digits, both of these digits are 1’s complements of each other. 1 is the complement of 0 and 0 is the complement of 1.

How to find one’s complement?

To find 1’s complement of any binary number replace 0’s with 1’s and vice versa. See this example.

Example:

What is the one’s complement of the following binary numbers?

  • 0101
  • 1111
  • 1001 1001

Solution:

1st number:

Binary number = 0101

1’s complement = 1010

2nd number:

Binary number = 1111

1’s complement = 0000

3rd number:

Binary number = 1001 1001

1’s complement = 0110 0110

One’s complement table

Decimal number

Binary number

1’s complement

1

0001

1110

2

0010

1101

3

0011

1100

4

0100

1011

5

0101

1010

6

0110

1001

7

0111

1000

8

1000

0111

9

1001

0110

10

1010

0101

Use 2’s complement calculator if you want to find two's complement after calculating one's complement of a binary number.

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