Two's(2s) Complement Calculator

Select if you want to enter decimal or binary number in two's complement calculator. Choose the number of bits, enter the number, and hit the Calculate button. 2's complement calculator will instantly show you the 2’s complement of the selected number.

2's Complement of Binary

What is two’s complement?

2’s complement of binary numbers is a mathematical operation with the biggest advantage that fundamental arithmetic operations such as addition, subtraction, multiplication remain similar for unsigned binary numbers.

It is used in computers and electronic devices to simplify arithmetic and mathematical operations.

You will have a clear idea of 2s complement after using the two's complement converter.

For further understanding, refer to the below section where we will answer the most important questions such as how to find two’s complement of a binary number? How to find 2s complement of a negative number?

How to find two’s complement of a decimal number?

Are you a student and want to learn the method to convert binary numbers to 2s complement? Here, we will explain the step by step method of two’s complement conversion without using the 2s complement calculator.


Find the two’s complement of (68)10.


Step 1: Convert the decimal number into binary number.

(68)10 = (01000100)2

Step 2: Take the one’s complement of the binary number. 1’s complement can be taken by converting the 0’s to 1 and 1’s to zero.

1’s complement of (01000100) = 10111011

Step 3: Add 1 to the number produced in the last step.

2's complement

So, two’s complement binary number of (68)10 = 10111100.

Note: To calculate the 2’s complement of binary number, skip the 1st step. You can reverse the steps if you want to convert two's complement to decimal.


How do you calculate two's complement?

To calculate two’s complement,

  • Convert given number in binary number.
  • Change all 0’s of binary number to 1 and all 1’s to 0.
  • Add 1 to the number produced in last step.

What is the 2 complement of 44?

2’s complement of 44 is 1101 0100.


  1. Two’s Complement, by tutorialspoint.com
  2. 2's Complement, Allmath