3.141 592 653 589 793 238 461 47 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 3.141 592 653 589 793 238 461 47(10) to 64 bit double precision IEEE 754 binary floating point representation standard (1 bit for sign, 11 bits for exponent, 52 bits for mantissa)

What are the steps to convert decimal number
3.141 592 653 589 793 238 461 47(10) to 64 bit double precision IEEE 754 binary floating point representation (1 bit for sign, 11 bits for exponent, 52 bits for mantissa)

1. First, convert to binary (in base 2) the integer part: 3.
Divide the number repeatedly by 2.

Keep track of each remainder.

We stop when we get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

2. Construct the base 2 representation of the integer part of the number.

Take all the remainders starting from the bottom of the list constructed above.

3(10) =

11(2)


3. Convert to binary (base 2) the fractional part: 0.141 592 653 589 793 238 461 47.

Multiply it repeatedly by 2.

Keep track of each integer part of the results.

Stop when we get a fractional part that is equal to zero.


  • #) multiplying = integer + fractional part;
  • 1) 0.141 592 653 589 793 238 461 47 × 2 = 0 + 0.283 185 307 179 586 476 922 94;
  • 2) 0.283 185 307 179 586 476 922 94 × 2 = 0 + 0.566 370 614 359 172 953 845 88;
  • 3) 0.566 370 614 359 172 953 845 88 × 2 = 1 + 0.132 741 228 718 345 907 691 76;
  • 4) 0.132 741 228 718 345 907 691 76 × 2 = 0 + 0.265 482 457 436 691 815 383 52;
  • 5) 0.265 482 457 436 691 815 383 52 × 2 = 0 + 0.530 964 914 873 383 630 767 04;
  • 6) 0.530 964 914 873 383 630 767 04 × 2 = 1 + 0.061 929 829 746 767 261 534 08;
  • 7) 0.061 929 829 746 767 261 534 08 × 2 = 0 + 0.123 859 659 493 534 523 068 16;
  • 8) 0.123 859 659 493 534 523 068 16 × 2 = 0 + 0.247 719 318 987 069 046 136 32;
  • 9) 0.247 719 318 987 069 046 136 32 × 2 = 0 + 0.495 438 637 974 138 092 272 64;
  • 10) 0.495 438 637 974 138 092 272 64 × 2 = 0 + 0.990 877 275 948 276 184 545 28;
  • 11) 0.990 877 275 948 276 184 545 28 × 2 = 1 + 0.981 754 551 896 552 369 090 56;
  • 12) 0.981 754 551 896 552 369 090 56 × 2 = 1 + 0.963 509 103 793 104 738 181 12;
  • 13) 0.963 509 103 793 104 738 181 12 × 2 = 1 + 0.927 018 207 586 209 476 362 24;
  • 14) 0.927 018 207 586 209 476 362 24 × 2 = 1 + 0.854 036 415 172 418 952 724 48;
  • 15) 0.854 036 415 172 418 952 724 48 × 2 = 1 + 0.708 072 830 344 837 905 448 96;
  • 16) 0.708 072 830 344 837 905 448 96 × 2 = 1 + 0.416 145 660 689 675 810 897 92;
  • 17) 0.416 145 660 689 675 810 897 92 × 2 = 0 + 0.832 291 321 379 351 621 795 84;
  • 18) 0.832 291 321 379 351 621 795 84 × 2 = 1 + 0.664 582 642 758 703 243 591 68;
  • 19) 0.664 582 642 758 703 243 591 68 × 2 = 1 + 0.329 165 285 517 406 487 183 36;
  • 20) 0.329 165 285 517 406 487 183 36 × 2 = 0 + 0.658 330 571 034 812 974 366 72;
  • 21) 0.658 330 571 034 812 974 366 72 × 2 = 1 + 0.316 661 142 069 625 948 733 44;
  • 22) 0.316 661 142 069 625 948 733 44 × 2 = 0 + 0.633 322 284 139 251 897 466 88;
  • 23) 0.633 322 284 139 251 897 466 88 × 2 = 1 + 0.266 644 568 278 503 794 933 76;
  • 24) 0.266 644 568 278 503 794 933 76 × 2 = 0 + 0.533 289 136 557 007 589 867 52;
  • 25) 0.533 289 136 557 007 589 867 52 × 2 = 1 + 0.066 578 273 114 015 179 735 04;
  • 26) 0.066 578 273 114 015 179 735 04 × 2 = 0 + 0.133 156 546 228 030 359 470 08;
  • 27) 0.133 156 546 228 030 359 470 08 × 2 = 0 + 0.266 313 092 456 060 718 940 16;
  • 28) 0.266 313 092 456 060 718 940 16 × 2 = 0 + 0.532 626 184 912 121 437 880 32;
  • 29) 0.532 626 184 912 121 437 880 32 × 2 = 1 + 0.065 252 369 824 242 875 760 64;
  • 30) 0.065 252 369 824 242 875 760 64 × 2 = 0 + 0.130 504 739 648 485 751 521 28;
  • 31) 0.130 504 739 648 485 751 521 28 × 2 = 0 + 0.261 009 479 296 971 503 042 56;
  • 32) 0.261 009 479 296 971 503 042 56 × 2 = 0 + 0.522 018 958 593 943 006 085 12;
  • 33) 0.522 018 958 593 943 006 085 12 × 2 = 1 + 0.044 037 917 187 886 012 170 24;
  • 34) 0.044 037 917 187 886 012 170 24 × 2 = 0 + 0.088 075 834 375 772 024 340 48;
  • 35) 0.088 075 834 375 772 024 340 48 × 2 = 0 + 0.176 151 668 751 544 048 680 96;
  • 36) 0.176 151 668 751 544 048 680 96 × 2 = 0 + 0.352 303 337 503 088 097 361 92;
  • 37) 0.352 303 337 503 088 097 361 92 × 2 = 0 + 0.704 606 675 006 176 194 723 84;
  • 38) 0.704 606 675 006 176 194 723 84 × 2 = 1 + 0.409 213 350 012 352 389 447 68;
  • 39) 0.409 213 350 012 352 389 447 68 × 2 = 0 + 0.818 426 700 024 704 778 895 36;
  • 40) 0.818 426 700 024 704 778 895 36 × 2 = 1 + 0.636 853 400 049 409 557 790 72;
  • 41) 0.636 853 400 049 409 557 790 72 × 2 = 1 + 0.273 706 800 098 819 115 581 44;
  • 42) 0.273 706 800 098 819 115 581 44 × 2 = 0 + 0.547 413 600 197 638 231 162 88;
  • 43) 0.547 413 600 197 638 231 162 88 × 2 = 1 + 0.094 827 200 395 276 462 325 76;
  • 44) 0.094 827 200 395 276 462 325 76 × 2 = 0 + 0.189 654 400 790 552 924 651 52;
  • 45) 0.189 654 400 790 552 924 651 52 × 2 = 0 + 0.379 308 801 581 105 849 303 04;
  • 46) 0.379 308 801 581 105 849 303 04 × 2 = 0 + 0.758 617 603 162 211 698 606 08;
  • 47) 0.758 617 603 162 211 698 606 08 × 2 = 1 + 0.517 235 206 324 423 397 212 16;
  • 48) 0.517 235 206 324 423 397 212 16 × 2 = 1 + 0.034 470 412 648 846 794 424 32;
  • 49) 0.034 470 412 648 846 794 424 32 × 2 = 0 + 0.068 940 825 297 693 588 848 64;
  • 50) 0.068 940 825 297 693 588 848 64 × 2 = 0 + 0.137 881 650 595 387 177 697 28;
  • 51) 0.137 881 650 595 387 177 697 28 × 2 = 0 + 0.275 763 301 190 774 355 394 56;
  • 52) 0.275 763 301 190 774 355 394 56 × 2 = 0 + 0.551 526 602 381 548 710 789 12;
  • 53) 0.551 526 602 381 548 710 789 12 × 2 = 1 + 0.103 053 204 763 097 421 578 24;

We didn't get any fractional part that was equal to zero. But we had enough iterations (over Mantissa limit) and at least one integer that was different from zero => FULL STOP (Losing precision - the converted number we get in the end will be just a very good approximation of the initial one).


4. Construct the base 2 representation of the fractional part of the number.

Take all the integer parts of the multiplying operations, starting from the top of the constructed list above:


0.141 592 653 589 793 238 461 47(10) =

0.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2)

5. Positive number before normalization:

3.141 592 653 589 793 238 461 47(10) =

11.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 1 positions to the left, so that only one non zero digit remains to the left of it:


3.141 592 653 589 793 238 461 47(10) =

11.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2) =

11.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2) × 20 =

1.1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000 01(2) × 21


7. Up to this moment, there are the following elements that would feed into the 64 bit double precision IEEE 754 binary floating point representation:

Sign 0 (a positive number)

Exponent (unadjusted): 1

Mantissa (not normalized):
1.1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000 01


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

Exponent (unadjusted) + 2(11-1) - 1 =

1 + 2(11-1) - 1 =

(1 + 1 023)(10) =

1 024(10)


9. Convert the adjusted exponent from the decimal (base 10) to 11 bit binary.

Use the same technique of repeatedly dividing by 2:


  • division = quotient + remainder;
  • 1 024 ÷ 2 = 512 + 0;
  • 512 ÷ 2 = 256 + 0;
  • 256 ÷ 2 = 128 + 0;
  • 128 ÷ 2 = 64 + 0;
  • 64 ÷ 2 = 32 + 0;
  • 32 ÷ 2 = 16 + 0;
  • 16 ÷ 2 = 8 + 0;
  • 8 ÷ 2 = 4 + 0;
  • 4 ÷ 2 = 2 + 0;
  • 2 ÷ 2 = 1 + 0;
  • 1 ÷ 2 = 0 + 1;

10. Construct the base 2 representation of the adjusted exponent.

Take all the remainders starting from the bottom of the list constructed above.


Exponent (adjusted) =

1024(10) =

100 0000 0000(2)


11. Normalize the mantissa.

a) Remove the leading (the leftmost) bit, since it's allways 1, and the decimal point, if the case.

b) Adjust its length to 52 bits, by removing the excess bits, from the right (if any of the excess bits is set on 1, we are losing precision...).


Mantissa (normalized) =

1. 1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000 01 =

1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000


12. The three elements that make up the number's 64 bit double precision IEEE 754 binary floating point representation:

Sign (1 bit) =
0 (a positive number)

Exponent (11 bits) =
100 0000 0000

Mantissa (52 bits) =
1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000


Decimal number 3.141 592 653 589 793 238 461 47 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 100 0000 0000 - 1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000

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How to convert numbers from the decimal system (base ten) to 64 bit double precision IEEE 754 binary floating point standard

Follow the steps below to convert a base 10 decimal number to 64 bit double precision IEEE 754 binary floating point:

  • 1. If the number to be converted is negative, start with its the positive version.
  • 2. First convert the integer part. Divide repeatedly by 2 the positive representation of the integer number that is to be converted to binary, until we get a quotient that is equal to zero, keeping track of each remainder.
  • 3. Construct the base 2 representation of the positive integer part of the number, by taking all the remainders from the previous operations, starting from the bottom of the list constructed above. Thus, the last remainder of the divisions becomes the first symbol (the leftmost) of the base two number, while the first remainder becomes the last symbol (the rightmost).
  • 4. Then convert the fractional part. Multiply the number repeatedly by 2, until we get a fractional part that is equal to zero, keeping track of each integer part of the results.
  • 5. Construct the base 2 representation of the fractional part of the number, by taking all the integer parts of the multiplying operations, starting from the top of the list constructed above (they should appear in the binary representation, from left to right, in the order they have been calculated).
  • 6. Normalize the binary representation of the number, shifting the decimal mark (the decimal point) "n" positions either to the left, or to the right, so that only one non zero digit remains to the left of the decimal mark.
  • 7. Adjust the exponent in 11 bit excess/bias notation and then convert it from decimal (base 10) to 11 bit binary, by using the same technique of repeatedly dividing by 2, as shown above:
    Exponent (adjusted) = Exponent (unadjusted) + 2(11-1) - 1
  • 8. Normalize mantissa, remove the leading (leftmost) bit, since it's allways '1' (and the decimal mark, if the case) and adjust its length to 52 bits, either by removing the excess bits from the right (losing precision...) or by adding extra bits set on '0' to the right.
  • 9. Sign (it takes 1 bit) is either 1 for a negative or 0 for a positive number.

Example: convert the negative number -31.640 215 from the decimal system (base ten) to 64 bit double precision IEEE 754 binary floating point:

  • 1. Start with the positive version of the number:

    |-31.640 215| = 31.640 215

  • 2. First convert the integer part, 31. Divide it repeatedly by 2, keeping track of each remainder, until we get a quotient that is equal to zero:
    • division = quotient + remainder;
    • 31 ÷ 2 = 15 + 1;
    • 15 ÷ 2 = 7 + 1;
    • 7 ÷ 2 = 3 + 1;
    • 3 ÷ 2 = 1 + 1;
    • 1 ÷ 2 = 0 + 1;
    • We have encountered a quotient that is ZERO => FULL STOP
  • 3. Construct the base 2 representation of the integer part of the number by taking all the remainders of the previous dividing operations, starting from the bottom of the list constructed above:

    31(10) = 1 1111(2)

  • 4. Then, convert the fractional part, 0.640 215. Multiply repeatedly by 2, keeping track of each integer part of the results, until we get a fractional part that is equal to zero:
    • #) multiplying = integer + fractional part;
    • 1) 0.640 215 × 2 = 1 + 0.280 43;
    • 2) 0.280 43 × 2 = 0 + 0.560 86;
    • 3) 0.560 86 × 2 = 1 + 0.121 72;
    • 4) 0.121 72 × 2 = 0 + 0.243 44;
    • 5) 0.243 44 × 2 = 0 + 0.486 88;
    • 6) 0.486 88 × 2 = 0 + 0.973 76;
    • 7) 0.973 76 × 2 = 1 + 0.947 52;
    • 8) 0.947 52 × 2 = 1 + 0.895 04;
    • 9) 0.895 04 × 2 = 1 + 0.790 08;
    • 10) 0.790 08 × 2 = 1 + 0.580 16;
    • 11) 0.580 16 × 2 = 1 + 0.160 32;
    • 12) 0.160 32 × 2 = 0 + 0.320 64;
    • 13) 0.320 64 × 2 = 0 + 0.641 28;
    • 14) 0.641 28 × 2 = 1 + 0.282 56;
    • 15) 0.282 56 × 2 = 0 + 0.565 12;
    • 16) 0.565 12 × 2 = 1 + 0.130 24;
    • 17) 0.130 24 × 2 = 0 + 0.260 48;
    • 18) 0.260 48 × 2 = 0 + 0.520 96;
    • 19) 0.520 96 × 2 = 1 + 0.041 92;
    • 20) 0.041 92 × 2 = 0 + 0.083 84;
    • 21) 0.083 84 × 2 = 0 + 0.167 68;
    • 22) 0.167 68 × 2 = 0 + 0.335 36;
    • 23) 0.335 36 × 2 = 0 + 0.670 72;
    • 24) 0.670 72 × 2 = 1 + 0.341 44;
    • 25) 0.341 44 × 2 = 0 + 0.682 88;
    • 26) 0.682 88 × 2 = 1 + 0.365 76;
    • 27) 0.365 76 × 2 = 0 + 0.731 52;
    • 28) 0.731 52 × 2 = 1 + 0.463 04;
    • 29) 0.463 04 × 2 = 0 + 0.926 08;
    • 30) 0.926 08 × 2 = 1 + 0.852 16;
    • 31) 0.852 16 × 2 = 1 + 0.704 32;
    • 32) 0.704 32 × 2 = 1 + 0.408 64;
    • 33) 0.408 64 × 2 = 0 + 0.817 28;
    • 34) 0.817 28 × 2 = 1 + 0.634 56;
    • 35) 0.634 56 × 2 = 1 + 0.269 12;
    • 36) 0.269 12 × 2 = 0 + 0.538 24;
    • 37) 0.538 24 × 2 = 1 + 0.076 48;
    • 38) 0.076 48 × 2 = 0 + 0.152 96;
    • 39) 0.152 96 × 2 = 0 + 0.305 92;
    • 40) 0.305 92 × 2 = 0 + 0.611 84;
    • 41) 0.611 84 × 2 = 1 + 0.223 68;
    • 42) 0.223 68 × 2 = 0 + 0.447 36;
    • 43) 0.447 36 × 2 = 0 + 0.894 72;
    • 44) 0.894 72 × 2 = 1 + 0.789 44;
    • 45) 0.789 44 × 2 = 1 + 0.578 88;
    • 46) 0.578 88 × 2 = 1 + 0.157 76;
    • 47) 0.157 76 × 2 = 0 + 0.315 52;
    • 48) 0.315 52 × 2 = 0 + 0.631 04;
    • 49) 0.631 04 × 2 = 1 + 0.262 08;
    • 50) 0.262 08 × 2 = 0 + 0.524 16;
    • 51) 0.524 16 × 2 = 1 + 0.048 32;
    • 52) 0.048 32 × 2 = 0 + 0.096 64;
    • 53) 0.096 64 × 2 = 0 + 0.193 28;
    • We didn't get any fractional part that was equal to zero. But we had enough iterations (over Mantissa limit = 52) and at least one integer part that was different from zero => FULL STOP (losing precision...).
  • 5. Construct the base 2 representation of the fractional part of the number, by taking all the integer parts of the previous multiplying operations, starting from the top of the constructed list above:

    0.640 215(10) = 0.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2)

  • 6. Summarizing - the positive number before normalization:

    31.640 215(10) = 1 1111.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2)

  • 7. Normalize the binary representation of the number, shifting the decimal mark 4 positions to the left so that only one non-zero digit stays to the left of the decimal mark:

    31.640 215(10) =
    1 1111.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2) =
    1 1111.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2) × 20 =
    1.1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2) × 24

  • 8. Up to this moment, there are the following elements that would feed into the 64 bit double precision IEEE 754 binary floating point representation:

    Sign: 1 (a negative number)

    Exponent (unadjusted): 4

    Mantissa (not-normalized): 1.1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0

  • 9. Adjust the exponent in 11 bit excess/bias notation and then convert it from decimal (base 10) to 11 bit binary (base 2), by using the same technique of repeatedly dividing it by 2, as shown above:

    Exponent (adjusted) = Exponent (unadjusted) + 2(11-1) - 1 = (4 + 1023)(10) = 1027(10) =
    100 0000 0011(2)

  • 10. Normalize mantissa, remove the leading (leftmost) bit, since it's allways '1' (and the decimal sign) and adjust its length to 52 bits, by removing the excess bits, from the right (losing precision...):

    Mantissa (not-normalized): 1.1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0

    Mantissa (normalized): 1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100

  • Conclusion:

    Sign (1 bit) = 1 (a negative number)

    Exponent (8 bits) = 100 0000 0011

    Mantissa (52 bits) = 1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100

  • Number -31.640 215, converted from decimal system (base 10) to 64 bit double precision IEEE 754 binary floating point =
    1 - 100 0000 0011 - 1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100