Tool for quickly calculating the 1's complement and 2's complement of binary numbers for their use in computer arithmetic.
Binary Complement - dCode
Tag(s) : Arithmetics
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Binary Complement
Binary Complement Calculator
Answers to Questions (FAQ)
What is 1's complement? (Definition)
In informatics, one's complement (bit flip) is writing a number inversing 0 and 1.
Example: Ones complement of 0111 becomes 1000
What is 2's complement? (Definition)
2's complement is a binary operation obtained by making a 1's complement (reversing all the bits of a number) and then adding 1 to the result (ignoring potential overflow).
Example: The two's complement of the number 5 (in binary 0101) is 1011
What is the 2's complement of the value 0?
The 2's complement of a stored zero number (composed of zeros) 0 (or 00000000) is itself (i.e. 0).
The 2's complement operation will set all the bits to 1, then adding 1 will result in all the bits being reset to 0 (because the overflow is ignored).
Why use the complement of a binary number?
The complement of a number is a very easy and quick number to calculate (mostly bit inversions) and which has several interesting properties compared to the original number.
In computing, signed integer storage uses complements to calculate the opposite of a number (negative/positive).
2's complement is even created to facilitate addition/subtraction type calculations.
Source code
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Binary Complement on dCode.fr [online website], retrieved on 2024-12-21,
