Convert 100 1001 0101 0101 1110 0110 1011 0101 Unsigned Base 2 Binary Number on 31 Bit - to Base 10 Decimal System

How to convert 100 1001 0101 0101 1110 0110 1011 0101(2), the unsigned base 2 binary number written on 31 bit, to a base 10 decimal system equivalent

What are the required steps to convert the base 2 unsigned binary number
100 1001 0101 0101 1110 0110 1011 0101(2) to a base 10 decimal system equivalent?

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

  • 230

    1

  • 229

    0

  • 228

    0

  • 227

    1

  • 226

    0

  • 225

    0

  • 224

    1

  • 223

    0

  • 222

    1

  • 221

    0

  • 220

    1

  • 219

    0

  • 218

    1

  • 217

    0

  • 216

    1

  • 215

    1

  • 214

    1

  • 213

    1

  • 212

    0

  • 211

    0

  • 210

    1

  • 29

    1

  • 28

    0

  • 27

    1

  • 26

    0

  • 25

    1

  • 24

    1

  • 23

    0

  • 22

    1

  • 21

    0

  • 20

    1

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

100 1001 0101 0101 1110 0110 1011 0101(2) =

(1 × 230 + 0 × 229 + 0 × 228 + 1 × 227 + 0 × 226 + 0 × 225 + 1 × 224 + 0 × 223 + 1 × 222 + 0 × 221 + 1 × 220 + 0 × 219 + 1 × 218 + 0 × 217 + 1 × 216 + 1 × 215 + 1 × 214 + 1 × 213 + 0 × 212 + 0 × 211 + 1 × 210 + 1 × 29 + 0 × 28 + 1 × 27 + 0 × 26 + 1 × 25 + 1 × 24 + 0 × 23 + 1 × 22 + 0 × 21 + 1 × 20)(10) =

(1 073 741 824 + 0 + 0 + 134 217 728 + 0 + 0 + 16 777 216 + 0 + 4 194 304 + 0 + 1 048 576 + 0 + 262 144 + 0 + 65 536 + 32 768 + 16 384 + 8 192 + 0 + 0 + 1 024 + 512 + 0 + 128 + 0 + 32 + 16 + 0 + 4 + 0 + 1)(10) =

(1 073 741 824 + 134 217 728 + 16 777 216 + 4 194 304 + 1 048 576 + 262 144 + 65 536 + 32 768 + 16 384 + 8 192 + 1 024 + 512 + 128 + 32 + 16 + 4 + 1)(10) =

1 230 366 389(10)

100 1001 0101 0101 1110 0110 1011 0101(2), Base 2 unsigned number converted and written as a base 10 decimal system equivalent:
100 1001 0101 0101 1110 0110 1011 0101(2) = 1 230 366 389(10)

Spaces were used to group digits: for binary, by 4, for decimal, by 3.

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How to convert unsigned binary numbers from binary system to decimal? Simply convert from base two to base ten.

To understand how to convert a number from base two to base ten, the easiest way is to do it through an example - convert the number from base two, 101 0011(2), to base ten:

  • 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, increasing each corresponding power of 2 by exactly one unit each time we move to the left:
  • powers of 2: 6 5 4 3 2 1 0
    digits: 1 0 1 0 0 1 1
  • 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:

    101 0011(2) =

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

    (64 + 0 + 16 + 0 + 0 + 2 + 1)(10) =

    (64 + 16 + 2 + 1)(10) =

    83(10)

  • Binary unsigned number (base 2), 101 0011(2) = 83(10), unsigned positive integer in base 10