Converter of signed binary one's complement: converting to decimal system (base ten) integer numbers

Convert signed binary one's complement numbers to decimal system (base ten) integers

Entered binary number length must be: 2, 4, 8, 16, 32, or 64 - otherwise extra bits on 0 will be added in front (to the left).

How to convert a signed binary number in one's complement representation to an integer in base ten:

1) In a signed binary one's complement, first bit (leftmost) indicates the sign, 1 = negative, 0 = positive.

2) Construct the unsigned binary number: flip all the bits in the signed binary one's complement representation (reversing the digits) - replace the bits set on 1 with 0s and the bits on 0 with 1s.

3) Multiply each bit of the binary number by its corresponding power of 2 that its place value represents.

4) Add all the terms up to get the positive integer number in base ten.

5) Adjust the sign of the integer number by the first bit of the initial binary number.

Latest binary numbers in one's complement representation converted to signed integers numbers in decimal system (base ten)

1010 0000 = -95 May 20 15:02 UTC (GMT)
1010 0111 = -88 May 20 14:56 UTC (GMT)
1100 0011 = -60 May 20 14:56 UTC (GMT)
0000 1000 0101 1111 = 2,143 May 20 14:39 UTC (GMT)
0000 1111 1111 1111 = 4,095 May 20 14:35 UTC (GMT)
0001 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0001 0111 0100 = 1,152,921,504,606,847,348 May 20 14:34 UTC (GMT)
1010 1100 = -83 May 20 14:31 UTC (GMT)
1000 1010 = -117 May 20 14:30 UTC (GMT)
0100 1011 = 75 May 20 14:29 UTC (GMT)
1000 = -7 May 20 14:26 UTC (GMT)
1100 1011 = -52 May 20 14:21 UTC (GMT)
0101 0011 = 83 May 20 13:50 UTC (GMT)
0000 1011 = 11 May 20 13:40 UTC (GMT)
All the converted signed binary one's complement numbers

How to convert signed binary numbers in one's complement representation from binary system to decimal

To understand how to convert a signed binary number in one's complement representation from binary system to decimal (base ten), the easiest way is to do it through an example - convert binary, 1001 1101, to base ten:

  • In a signed binary one's complement, first bit (leftmost) indicates the sign, 1 = negative, 0 = positive. The first bit is 1, so our number is negative.
  • Get the binary representation of the positive number, flip all the bits in the signed binary one's complement representation (reversing the digits) - replace the bits set on 1 with 0s and the bits on 0 with 1s:
    !(1001 1101) = 0110 0010
  • Write bellow the positive binary number representation in base two, and above each bit that makes up the binary number write the corresponding power of 2 (numeral base) that its place value represents, starting with zero, from the right of the number (rightmost bit), walking to the left of the number by increasing each corresonding power of 2 by exactly one unit:
  • powers of 2: 7 6 5 4 3 2 1 0
    digits: 0 1 1 0 0 0 1 0
  • Build the representation of the positive number in base 10, by taking each digit of the binary number, multiplying it by the corresponding power of 2 and then adding all the terms up:

    0110 0010(2) =


    (0 × 27 + 1 × 26 + 1 × 25 + 0 × 24 + 0 × 23 + 0 × 22 + 1 × 21 + 0 × 20)(10) =


    (0 + 64 + 32 + 0 + 0 + 0 + 2 + 0)(10) =


    (64 + 32 + 2)(10) =


    98(10)

  • Signed binary number in one's complement representation, 1001 1110 = -98(10), a signed negative integer in base 10