## 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:

2^{6}

0 2^{5}

1 2^{4}

0 2^{3}

1 2^{2}

0 2^{1}

1 2^{0}

1

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

#### 010 1011_{(2)} =

#### (0 × 2^{6} + 1 × 2^{5} + 0 × 2^{4} + 1 × 2^{3} + 0 × 2^{2} + 1 × 2^{1} + 1 × 2^{0})_{(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:

## 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).