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One's Complement Calculator

One's Complement Calculator





No. of Binary Digits:

Number of Bits

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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An online one’s complement calculator that allows you to find the 1s complement of the given decimal, binary or hexadecimal number. Also, the one’s complement converter can use 16-bit, 12-bit, 8-bit and 4-bit representations, and it also provides custom binary representations to convert numbers to different number systems. Here you can find different conversions and tables of 1’s complement.

What is One’s Complement?

One’s complement of binary numbers is the values obtained by transforming all the bits in the binary representation of the number by inverting 0s and 1s. It is mostly used in the CS field, where it has varying effects relying on how a particular computer represents numbers.

So, the online one’s complement converter can convert one’s complement to decimal and decimal to one’s complement as well as hexadecimal to binary, decimal, and one’s complement.

1’s Complement of a Binary Number:

There is a simple method to convert a binary number into a 1s complement. To get one’s complement of a specific binary number, simply swap the given number. However, you can use one’s complement calculator for finding the exact one complement of a binary number.

You can easily implement a logic circuit with only NOT gate for every bit of Binary number input. The implementation of a logic circuit of a 4bit one’s complement is given below.

one's complement calculator

However, an Online Two’s Complement Calculator allows you to calculate 2s complement of the given binary, decimal, or hexadecimal number.

Table For one’s complement:

Generally, one’s complement calculator allows you to determine 1s complement in different bits of representation, here’s a table of 4-bit representation values:

Binary numbers 1’s complement
0001 1110
0010 1101
0100 1011
0110 1001
1001 0110
1010 0101
1101 0010
1110 0001

1s Complementation in Signed Binary Number:

One’s complement calculator provides signed number representation. The positive numbers are usually represented as Binary numbers so, there’s nothing to do with positive binary numbers. If the number is negative then it is represented as 1’s complement representation. Firstly, represent the number with the +ve sign and then take the ones complement of that number.

Subtractions by Ones Complement:

The method to subtract two binary number using one’s complement is:

  • Take 1s complement of the binary number
  • Then, add it to the least significant bit of the given result
  • If there is no bit 1, then take 1s compliment, so, the result will be a negative value

Moreover, an Online Binary Calculator helps you to do subtraction, addition, division, or multiplication on two binary numbers as well as with 8, 10 & 16 base numbers.

Additions by 1s Complement:

There are different scenarios for the addition of two binary numbers using 1’s complement. These are explained below.

Addition of negative and positive number when the +ve number has greater magnitude:

First of all, you need to find 1s complement with the one’s complement calculator, after that, a number has greater magnitude, just take simply 1’s complement of any -ve number, and the sum is added to the least significant bit (LSB).

Addition of two -ve numbers:

Initially, take 1’s complement for both numbers, then add 1’s complement of numbers. Since there will always be an end bit, so add it again to the result. Now, take 1’s complement of the previous result, so this will be a -ve number.

Alternatively, you can add both negative numbers directly, and get this result which will be negative only.

How One’s Complement Calculator Works?

The 1’s complement calculator helps you to convert a given number into decimal, binary, and hexadecimal numbers by following these steps:


  • Select the input format either you desire to compute the one’s complement with different number systems.
  • Now, select an option, the calculator display number ranges that you have to plug values into the given fields.
  • Then, select any bit-representation of binary numbers from the drop-down list.
  • Click on the “Calculate” button.


  • Ones complement calculator displays the one’s complements of the entered number.
  • It also shows the results in the form of a table with binary, decimal, and hexadecimal forms.


What is Negative Zero?

Negative zero is an algorithm where all bits in a signed value are 1. Actually, this follows the ones’ complement rules that a number is negative when the left number is 1 and that a -ve number is the complement of the number magnitude.

What is End-Around-Carry?

End-around-carry is a type of carrying that is needed when a minus one complement representation of numbers is used and two several integers so represented are sum of the numbers.

What are Signed number representations in Computing? 

The signed number representations are essential to encode -ve numbers in binary number systems. In mathematics, -ve values in any base are represented with a minus sign “−”.


An online one’s complement calculator helps you to find 1’s complement and convert the entered number into binary and other number systems in a fraction of a second. When you do all these calculations by hand, it may increase the chances of errors, but thanks to one’s complement addition calculator that provides all conversions 100% accurately in the form of a table.


From the source of Wikipedia: Number representation, end-around borrow, Negative zero, Avoiding negative zero.

From the source of geek for geek: 1’s complement of a binary number, Addition of two negative numbers.

From the source of Tutorial Points: 1’s Complement of a Binary Number, Uses of 1’s Complement Binary Numbers, Range of Numbers, Additions by 1’s Complement.