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Two's Complement Calculator

Enter any logical number (binary, decimal, or hexadecimal) and select the order of binary digits and hit the calculate button to find the two's complement with detailed information.

Two's Complement Calculator
Two's Complement Add/Sub

Input Format

Decimal Number Range

-128 to 127

Binary Number Range

8 Digits (without leading zeros)

Hex Number Range

0-9 and A-F (16-Digits)


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This free two’s complement calculator allows you to calculate 2’s complement of the given decimal, binary or hexadecimal number. No doubt, number conversion is complicated to express but the 2s complement calculator changes the entered number into one's complement, two’s complement, signed binary to decimal, and hexadecimal.

What is Two's Complement?

There is a simple mathematical operation on different binary numbers and used in computing as the method of signed number representation. To get 2’s complement of a binary system, just transpose the certain number and add one to the LSB (Least Significant Bit) of given results. For instance, to convert decimal to 2’s complement, we have a number (20)10 which is equal to (0001 0100)2. Now convert 1 to 0 and 0 to 1, so number is 1110 1011 and add 1 in one’s complement to get two’s 1110 1011 +1 = 1110 1100.

How Two's Complement Calculator Works?

The 2’s complement calculator works as follows to find the 2s complement to decimal of entered values, add, or subtract them. Input:

  • First of all, you need to select the option either you want to find twos complement to decimal with decimal, binary or hexadecimal number form.
  • Once selected, you have to add the values into the given fields.
  • Select any number of binary digits from the drop-down menu according to your need.
  • Once done, hit the calculate button.


  • Two complements of a given number.
  • Also shows the results in binary, decimal, hexadecimal, and 1’s complement.

For Two’s Complement Addition/Subtraction:


  • Write down the first two’s complement binary number
  • Repeat the same for second number
  • Select the operation from the middle
  • Tap the calculate button


  • Addition of Two’s complement binary numbers
  • Subtraction of Two’s complement binary numbers


From the source of Wikipedia: Converting from two's complement representation, From the ones' complement, Working from LSB towards MSB.  

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