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Two's Complement Calculator

Two's Complement Calculator

Enter any logical number (binary, decimal, or hexadecimal) and select the order of binary digits. The calculator will instantly find its two’s complement.





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)

two's complement Add/sub calculator

Two's Complement Add/Sub Calculator

Two's complement Binary 1:


Two's complement Binary 2:


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An online 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. The twos complement converter can convert numbers with 4-bit, 8-bit, 12-bit, and 16-bit representations, and add custom representations for the binary conversion.

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.

Well, it doesn’t matter whether you have decimal or hexadecimal numbers, an online two’s complement converter allows you to convert any number into binary number as well as apply the mathematical operation.

Basic Conversions by Two’s Complement Calculator:

When it comes to two’s complement calculations, our 2s complement calculator helps you to perform different conversions. Let’s take a look to get a better understanding:

Decimal to One’s Complement:

To get a 1s complement of any decimal number, the converter changes the given decimal or hexadecimal number into binary form and simply inverts the number.

Example 1:

Elaborate 1’s complement of 80.


(80)10 = (0101 0000)2

Now, invert the number

(0101 0000)2 = 1010 1111

Decimal to Two’s Complement:

To convert decimal to 2’s complement, you just enter a number as an input, the twos complement calculator converts the entered value into a binary system, then apply the 1s complement operation on it and add 1 to the LSB of the given result.

Example 2:

Find 2s complement of 80.


(80)10 = (0101 0000)2

By applying 1’s complement operation

(0101 0000)2 = 1010 1111

So, add 1 to the least significant bit

1010 1111 + 1 = 1011 0000

Decimal to Binary:

There are many direct or indirect methods to convert any signed decimal to binary number. But 2’s complement calculator takes the input from a user and changes it into a binary number by using a decimal to binary formula.

However, An Online Binary Calculator allows you to do arithmetic operations on two binary numbers as well as with 8, 10 & 16 base numbers.

Example 3:

Convert 112 into a binary number.


First perform short division by 2 with a reminder.

Division Remainder
112 ÷ 2 = 56 0
56 ÷ 2 = 28 0
28 ÷ 2 = 14 0
14 ÷ 2 = 7 0
7 ÷ 2 = 3 1
3 ÷ 2 = 1 1
1 ÷ 2 = 0 1

Now, write a reminder in reverse order (bottom to top), this will be 1110000 which is equal to decimal integer 112.

Decimal to Hexadecimal:

To convert a decimal number to hexadecimal you need to divide the number by 16 and write down the remainder in hexadecimal, divide the result again and again by 16 until the result is 0. Now, the hex value is a sequence of reminders from bottom to top. Moreover, by using a two’s complement calculator you can make these calculations in a very efficient way.

Example 4:

Convert 256 decimal to hex.


Division Results Remainder in hex
256 / 16 16 0
16 / 16 1 0
1 / 16 0 1


Now the answer is (256)16 = (100)10

Binary to One’s Complement:

To convert the binary numbers into 1’s complement, you need to enter a binary, decimal, or hexadecimal number as an input, then an online calculator simply changes that value in the binary form then inverts the given number.

Example 5:

Find the 1s complement of 1110 0000.


The binary number is (1110 0000)2 and apply this mathematical operation.

(1110 0000)2 = 0001 1111

Binary to Two’s Complement:

The 2s complement converter will convert the binary number into 2’s complement and transpose the binary number as well as add 1 to the LSB of the given result.

Example 6:

Find the 2s complement of 1110 0000.


Now, the binary number is (1110 0000)2, and inverts the number

(1110 0000)2 = 0001 1111

So time to add 1 to the LSB of this result

0001 1111 + 1 = 0010 0000

Binary to Decimal:

In order to turn a binary number into a decimal number, each bit is a power of 2. This means every binary number has a power of 2 with the rightmost position of 2^0.

Example 7:

Find the decimal number of a binary number (1010)_2?


The binary (1010)_2 can be written as follows:

(1 * 2^3) + (0 * 2^2) + (1 * 2^1) + (0 * 2^0)

8 + 0 + 2 + 0 = 10

So, the decimal number of (1010)_2 is 10.

Binary to Hexadecimal:

Two’s complement calculator convert signed binary to hex, you need to remember each hexadecimal number represents four binary digits and makes the group in sets of four. In such cases don’t have enough digits to make up the set of 4 digits, then add extra 0’s to make a group.

This online calculator can do all these calculations instantly by using the standard formula of convert numbers from binary to hexadecimal. Furthermore, the Rounding Calculator allows you to round numbers up or down to nearest ones, tenths, hundredths, thousandths, ten thousand, hundred thousand.

Example 8:

Convert (10001110)_2 to (8E)_16.


firstly, convert 8 bit binary into groups of (1000) and (1110) into hexadecimal.

1000 1110
8421 8421
8000 8420
8 15
8 E

So, 8E is equal to 10001110.

Hexadecimal to One’s Complement:

In order to convert a hexadecimal number into one’s complement, the 1s complement calculator first changes the hex number into a binary number and transposes the given result.

For instance, 8E is equal to 10001110, then apply the 1’s complement operation on it by inverting the binary number. So the one’s complement of 8E is 01110001.

Hexadecimal to Two’s Complement:

The 2’s complement calculator takes the 1s complement of hexadecimal number and adds 1 into the given results. If the one’s complement of 8E is 01110001 then our calculator adds 1’s in this number, so the 2s complement of 01110001 is equal to 01110010.

Hexadecimal to Binary:

If you need to convert hexadecimal numbers into binary, 2’s complement converter will convert letter values of hexadecimal(0, …,9, A, …, F) into their decimal equivalents and change them into the power of two (8, 4, 2, or 1). Furthermore, write down 1 below the power of two that are used and write 0 that is not used.

Hexadecimal to Decimal:

The online hexadecimal two’s complement converter will convert a hex number into binary or octal, then it converts into a decimal number. If the hex number is 8E and its binary number is 01110001 then an online calculator changes this number into decimal which is 142.

Twos Complement Addition:

Adding 2s complement is very easy. It’s just like the addition of the ordinary binary numbers. The only difference here is that you deal with two’s complement form of the binary numbers. Moreover, you can also use our best two’s complement addition calculator for adding twos complement in a fragment of seconds.

Example Problems:

Let us resolve a couple of examples to represent the addition as follows:

Example # 01:
Add the following binary two’s complements:



Here we have:

(1010100)_2 + (0010100)_2
= (1101000)_2

The free 2s complement addition calculator also goes for displaying the same answer but in seconds that saves you a lot of time.

Example # 02:
Convert 13 and 12 to their equivalent two’s complements and add them.

First of all, we will determine the binary form of the given numbers:

13 = 1111
12 = 1100

Computing 1’s complement:
13 = 1111 = 0000

12 = 1100 = 0011

Computing 2’s complement:


(0000) + 1

= 0001

(0011) + 1

Adding 2s complements:
(0001) + (1100)

= 1101

In case you feel a hurdle during calculations, let this free 2’s complement addition calculator fade them away for you.

Twos Complement Subtraction:

Subtracting two’s complement is reciprocal to that of addition. All you need to follow is the ordinary binary subtraction rules. The free 2s complement subtraction calculator also follows the rules to perform subtraction of two’s complements.

Example Problems:

Get through the example below to understand how the 2’s complement subtraction is carried out.

Example # 01:
Subtract the following two’s complements:




Here we have:

(10111) – (10000)

= 111

Which is our required answer that could also be cross-checked by using our best two’s complement subtraction calculator.

How Two’s Complement Calculator Works?

The 2’s complement calculator works as follows to find the 2s complement of entered values, add, or subtract them. Let’s take a look at its working!

For Simple Two’s Complement:


  • First of all, you need to select the option either you want to find twos complement 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.

This 2s complement calculator displays the following results:

  • 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


The free two’s complement addition calculator performs:

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


What is Number System in Computing?

The number system is a technique which used to work and represent numbers is called a number system. Some most common number systems are binary, decimal, octal, and hexadecimal, etc.

How to Work with Signed Notation in Binary?

In signed notation or Two’s complement representation, the first bit of number tells about the sign. If a number with a leading 1 shows negative while leading 0 denotes a positive value. So, in 8-bit, we can write any number from negative 128 to positive 127.

How to Convert Signed Binary to Decimal?

For conversion of signed binary to decimal is simple, but multiply -1 with the leading digit instead of 1. For instance,

Decimal = – 1*2^7 + 0*2^6 + 1*2^5 + 1*2^4 + 1*2^3+ 0*2^2 + 1*2^1 + 1*2^0


Decimal = – 128 + 32 + 16 + 8 + 2 + 1 = -69

What subtraction of two’s complements binary numbers given below yields?
100101 and 110001

The result of subtracting the given numbers is -1100 that could also be verified by using 2s complement subtraction calculator.

Final Point:

Hence, two’s complement calculator makes all complement-related calculations just handy. Find the 2s complement of any number manually is a very difficult task because it needs many conversions to get accurate results. So, it’s a great platform for K-12 educators and professionals to learn and apply the examples for learning different types of conversions in the number system.


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

From the source of Tutorials Point: 2’s Complement of a Binary Number, Uses of 2’s Complement Binary Numbers, Range of Numbers.

From the source of Cornell: Conversion from Two’s Complement, Arithmetic with Two’s Complement, Why Inversion and Adding One Works.