Convert 1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011 Base 2 Signed Binary Number on 64 Bit - To Base 10 Decimal System Integer

How to convert 1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011(2), the base 2 signed binary number on 64 bit, to a base 10 decimal system integer

What are the steps to convert the base 2 signed binary number
1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011(2) to a base 10 decimal system equivalent integer?

1. Is this a positive or a negative number?

1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011 is the binary representation of a negative integer, on 64 bits (8 Bytes).


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

2. Construct the unsigned binary number.

Exclude the first bit (the leftmost), that is reserved for the sign:

1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011 = 001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011


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

  • 262

    0

  • 261

    0

  • 260

    1

  • 259

    0

  • 258

    1

  • 257

    0

  • 256

    1

  • 255

    0

  • 254

    0

  • 253

    1

  • 252

    0

  • 251

    1

  • 250

    0

  • 249

    0

  • 248

    1

  • 247

    0

  • 246

    1

  • 245

    0

  • 244

    1

  • 243

    0

  • 242

    1

  • 241

    0

  • 240

    0

  • 239

    1

  • 238

    0

  • 237

    1

  • 236

    0

  • 235

    1

  • 234

    0

  • 233

    1

  • 232

    0

  • 231

    0

  • 230

    1

  • 229

    0

  • 228

    1

  • 227

    0

  • 226

    1

  • 225

    0

  • 224

    1

  • 223

    0

  • 222

    0

  • 221

    1

  • 220

    1

  • 219

    0

  • 218

    1

  • 217

    0

  • 216

    1

  • 215

    0

  • 214

    0

  • 213

    1

  • 212

    0

  • 211

    1

  • 210

    0

  • 29

    1

  • 28

    0

  • 27

    1

  • 26

    1

  • 25

    0

  • 24

    1

  • 23

    1

  • 22

    0

  • 21

    1

  • 20

    1

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

001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011(2) =

(0 × 262 + 0 × 261 + 1 × 260 + 0 × 259 + 1 × 258 + 0 × 257 + 1 × 256 + 0 × 255 + 0 × 254 + 1 × 253 + 0 × 252 + 1 × 251 + 0 × 250 + 0 × 249 + 1 × 248 + 0 × 247 + 1 × 246 + 0 × 245 + 1 × 244 + 0 × 243 + 1 × 242 + 0 × 241 + 0 × 240 + 1 × 239 + 0 × 238 + 1 × 237 + 0 × 236 + 1 × 235 + 0 × 234 + 1 × 233 + 0 × 232 + 0 × 231 + 1 × 230 + 0 × 229 + 1 × 228 + 0 × 227 + 1 × 226 + 0 × 225 + 1 × 224 + 0 × 223 + 0 × 222 + 1 × 221 + 1 × 220 + 0 × 219 + 1 × 218 + 0 × 217 + 1 × 216 + 0 × 215 + 0 × 214 + 1 × 213 + 0 × 212 + 1 × 211 + 0 × 210 + 1 × 29 + 0 × 28 + 1 × 27 + 1 × 26 + 0 × 25 + 1 × 24 + 1 × 23 + 0 × 22 + 1 × 21 + 1 × 20)(10) =

(0 + 0 + 1 152 921 504 606 846 976 + 0 + 288 230 376 151 711 744 + 0 + 72 057 594 037 927 936 + 0 + 0 + 9 007 199 254 740 992 + 0 + 2 251 799 813 685 248 + 0 + 0 + 281 474 976 710 656 + 0 + 70 368 744 177 664 + 0 + 17 592 186 044 416 + 0 + 4 398 046 511 104 + 0 + 0 + 549 755 813 888 + 0 + 137 438 953 472 + 0 + 34 359 738 368 + 0 + 8 589 934 592 + 0 + 0 + 1 073 741 824 + 0 + 268 435 456 + 0 + 67 108 864 + 0 + 16 777 216 + 0 + 0 + 2 097 152 + 1 048 576 + 0 + 262 144 + 0 + 65 536 + 0 + 0 + 8 192 + 0 + 2 048 + 0 + 512 + 0 + 128 + 64 + 0 + 16 + 8 + 0 + 2 + 1)(10) =

(1 152 921 504 606 846 976 + 288 230 376 151 711 744 + 72 057 594 037 927 936 + 9 007 199 254 740 992 + 2 251 799 813 685 248 + 281 474 976 710 656 + 70 368 744 177 664 + 17 592 186 044 416 + 4 398 046 511 104 + 549 755 813 888 + 137 438 953 472 + 34 359 738 368 + 8 589 934 592 + 1 073 741 824 + 268 435 456 + 67 108 864 + 16 777 216 + 2 097 152 + 1 048 576 + 262 144 + 65 536 + 8 192 + 2 048 + 512 + 128 + 64 + 16 + 8 + 2 + 1)(10) =

1 524 843 039 392 344 795(10)

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

1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011(2) = -1 524 843 039 392 344 795(10)

1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011(2), Base 2 signed binary number, converted and written as a base 10 decimal system equivalent integer:
1001 0101 0010 1001 0101 0100 1010 1010 0101 0101 0011 0101 0010 1010 1101 1011(2) = -1 524 843 039 392 344 795(10)

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

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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