Signed binary number 1010 1011 converted to an integer in base ten

Signed binary 1010 1011(2) to an integer in decimal system (in base 10) = ?

1. Is this a positive or a negative number?


In a signed binary, first bit (the leftmost) is reserved for the sign, 1 = negative, 0 = positive. This bit does not count when calculating the absolute value.

1010 1011 is the binary representation of a negative integer, on 8 bits.


2. Construct the unsigned binary number, exclude the first bit (the leftmost), that is reserved for the sign:

1010 1011 = 010 1011

3. Map the unsigned binary number's digits versus the corresponding powers of 2 that their place value represent:

    • 26

      0
    • 25

      1
    • 24

      0
    • 23

      1
    • 22

      0
    • 21

      1
    • 20

      1

4. Multiply each bit by its corresponding power of 2 and add all the terms up:

010 1011(2) =


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


(0 + 32 + 0 + 8 + 0 + 2 + 1)(10) =


(32 + 8 + 2 + 1)(10) =


43(10)

5. If needed, adjust the sign of the integer number by the first digit (leftmost) of the signed binary:

1010 1011(2) = -43(10)

Number 1010 1011(2) converted from signed binary to an integer in decimal system (in base 10):
1010 1011(2) = -43(10)

Spaces used to group digits: for binary, by 4.


More operations of this kind:

1010 1010 = ?

1010 1100 = ?


Convert signed binary numbers to integers in decimal system (base 10)

First bit (the leftmost) is reserved for the sign, 1 = negative, 0 = positive. This bit does not count when calculating the absolute value.

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 to an integer in base ten:

1) Construct the unsigned binary number: exclude the first bit (the leftmost); this bit is reserved for the sign, 1 = negative, 0 = positive and does not count when calculating the absolute value (without sign).

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

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

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

Latest signed binary numbers converted to signed integers in decimal system (base ten)

1010 1011 = -43 Sep 20 01:29 UTC (GMT)
0000 0000 0000 0001 1100 1110 1111 0100 = 118,516 Sep 20 01:29 UTC (GMT)
1100 1110 1111 0100 = -20,212 Sep 20 01:28 UTC (GMT)
0101 1111 1111 0111 1111 1111 1111 1111 = 1,610,088,447 Sep 20 01:28 UTC (GMT)
0010 1101 1110 1001 = 11,753 Sep 20 01:28 UTC (GMT)
0110 0000 0000 0000 0000 0000 0000 0001 = 1,610,612,737 Sep 20 01:28 UTC (GMT)
0000 0000 0000 0000 0000 0000 0000 0001 1111 1111 1111 1111 1111 1111 1001 1111 = 8,589,934,495 Sep 20 01:28 UTC (GMT)
1010 1001 0010 1001 = -10,537 Sep 20 01:28 UTC (GMT)
0110 1000 1110 1101 = 26,861 Sep 20 01:27 UTC (GMT)
1111 1111 1111 1110 1111 1100 0001 1010 1111 1000 0010 0010 1100 0101 0111 1010 = -9,223,086,279,663,732,090 Sep 20 01:26 UTC (GMT)
0000 0000 0000 1111 1111 1111 0100 1110 = 1,048,398 Sep 20 01:26 UTC (GMT)
1111 1111 1110 0000 0000 0111 1111 1001 = -2,145,388,537 Sep 20 01:26 UTC (GMT)
1010 0010 0111 1011 = -8,827 Sep 20 01:25 UTC (GMT)
All the converted signed binary numbers to integers in base ten

How to convert signed binary numbers from binary system to decimal (base ten)

To understand how to convert a signed binary number from binary system to decimal (base ten), the easiest way is to do it through an example - convert the binary number, 1001 1110, to base ten:

  • In a signed binary, the first bit (leftmost) is reserved for the sign, 1 = negative, 0 = positive. This bit does not count when calculating the absolute value (value without sign). The first bit is 1, so our number is negative.
  • Write bellow the binary number 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 and increasing each corresonding power of 2 by exactly one unit, but ignoring the very first bit (the leftmost, the one representing the sign):
  • powers of 2:   6 5 4 3 2 1 0
    digits: 1 0 0 1 1 1 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, but also taking care of the number sign:

    1001 1110 =


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


    - (0 + 0 + 16 + 8 + 4 + 2 + 0)(10) =


    - (16 + 8 + 4 + 2)(10) =


    -30(10)

  • Binary signed number, 1001 1110 = -30(10), signed negative integer in base 10