One's Complement Calculator

For two's complements Click Two's Complement Calculator
Enter a decimal number between -128 to 127.

1's & 2's Complement Calculator to find the two's complement and one's complement of a given binary number.

To calculate the One's & Two's complement of a Decimal number, select the Decimal radio button, just type the decimal number in the text box provided and click on the calculate button displays the equivalent 1's or 2's complement number. This calculator can support and find out the 1's & 2's Complement for both 8 bit, 16 bit and 32 bit binary numbers.

The 1's complement of a binary number is the number that resulted by changing all ones to zeros and all zeros to ones. Whereas, the 2's complement is the binary number that resulted by adding 1 to one's complement of a given binary number.

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