 # One's Complement Calculator

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

Give Us Feedback

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.