Two’s Complement Calculator

Enter the decimal number you want to convert and the number of bits you need and click the ‘Convert’ button to get the two’s complement binary number, or enter the two’s complement binary number and click the ‘Convert’ button to get the decimal number.

Decimal
Number of Bits
Two’s Complement Binary




 

Two’s Complement Binary
Decimal


 

See also our One’s Complement Calculator.

Two’s complement is a method for representing signed numbers in binary number system. When we want to convert a binary number to two’s complement we revert each bit of this number, meaning 1 changes to 0 and 0 changes to 1, and then add 1 to the result. For positive numbers the leftmost bit is 0 and for negative numbers the leftmost bit is 1. The number zero has only one representation (in contrary to one’s complement).

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