# 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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## 1s Complement Calculator

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

This 1's complement calculator also provides a comprehensive step-wise process of finding 1s complement.

## What is one’s complement?

One’s complement can be defined as the inverse of a binary number. By inverse, it does not mean adding 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.

## References

### Math Tools

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