1.745 459 324 169 999 826 281 696 186 924 818 902 87 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 1.745 459 324 169 999 826 281 696 186 924 818 902 87(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
1.745 459 324 169 999 826 281 696 186 924 818 902 87(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: 1.
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;
  • 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.

1(10) =

1(2)


3. Convert to binary (base 2) the fractional part: 0.745 459 324 169 999 826 281 696 186 924 818 902 87.

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) 0.745 459 324 169 999 826 281 696 186 924 818 902 87 × 2 = 1 + 0.490 918 648 339 999 652 563 392 373 849 637 805 74;
  • 2) 0.490 918 648 339 999 652 563 392 373 849 637 805 74 × 2 = 0 + 0.981 837 296 679 999 305 126 784 747 699 275 611 48;
  • 3) 0.981 837 296 679 999 305 126 784 747 699 275 611 48 × 2 = 1 + 0.963 674 593 359 998 610 253 569 495 398 551 222 96;
  • 4) 0.963 674 593 359 998 610 253 569 495 398 551 222 96 × 2 = 1 + 0.927 349 186 719 997 220 507 138 990 797 102 445 92;
  • 5) 0.927 349 186 719 997 220 507 138 990 797 102 445 92 × 2 = 1 + 0.854 698 373 439 994 441 014 277 981 594 204 891 84;
  • 6) 0.854 698 373 439 994 441 014 277 981 594 204 891 84 × 2 = 1 + 0.709 396 746 879 988 882 028 555 963 188 409 783 68;
  • 7) 0.709 396 746 879 988 882 028 555 963 188 409 783 68 × 2 = 1 + 0.418 793 493 759 977 764 057 111 926 376 819 567 36;
  • 8) 0.418 793 493 759 977 764 057 111 926 376 819 567 36 × 2 = 0 + 0.837 586 987 519 955 528 114 223 852 753 639 134 72;
  • 9) 0.837 586 987 519 955 528 114 223 852 753 639 134 72 × 2 = 1 + 0.675 173 975 039 911 056 228 447 705 507 278 269 44;
  • 10) 0.675 173 975 039 911 056 228 447 705 507 278 269 44 × 2 = 1 + 0.350 347 950 079 822 112 456 895 411 014 556 538 88;
  • 11) 0.350 347 950 079 822 112 456 895 411 014 556 538 88 × 2 = 0 + 0.700 695 900 159 644 224 913 790 822 029 113 077 76;
  • 12) 0.700 695 900 159 644 224 913 790 822 029 113 077 76 × 2 = 1 + 0.401 391 800 319 288 449 827 581 644 058 226 155 52;
  • 13) 0.401 391 800 319 288 449 827 581 644 058 226 155 52 × 2 = 0 + 0.802 783 600 638 576 899 655 163 288 116 452 311 04;
  • 14) 0.802 783 600 638 576 899 655 163 288 116 452 311 04 × 2 = 1 + 0.605 567 201 277 153 799 310 326 576 232 904 622 08;
  • 15) 0.605 567 201 277 153 799 310 326 576 232 904 622 08 × 2 = 1 + 0.211 134 402 554 307 598 620 653 152 465 809 244 16;
  • 16) 0.211 134 402 554 307 598 620 653 152 465 809 244 16 × 2 = 0 + 0.422 268 805 108 615 197 241 306 304 931 618 488 32;
  • 17) 0.422 268 805 108 615 197 241 306 304 931 618 488 32 × 2 = 0 + 0.844 537 610 217 230 394 482 612 609 863 236 976 64;
  • 18) 0.844 537 610 217 230 394 482 612 609 863 236 976 64 × 2 = 1 + 0.689 075 220 434 460 788 965 225 219 726 473 953 28;
  • 19) 0.689 075 220 434 460 788 965 225 219 726 473 953 28 × 2 = 1 + 0.378 150 440 868 921 577 930 450 439 452 947 906 56;
  • 20) 0.378 150 440 868 921 577 930 450 439 452 947 906 56 × 2 = 0 + 0.756 300 881 737 843 155 860 900 878 905 895 813 12;
  • 21) 0.756 300 881 737 843 155 860 900 878 905 895 813 12 × 2 = 1 + 0.512 601 763 475 686 311 721 801 757 811 791 626 24;
  • 22) 0.512 601 763 475 686 311 721 801 757 811 791 626 24 × 2 = 1 + 0.025 203 526 951 372 623 443 603 515 623 583 252 48;
  • 23) 0.025 203 526 951 372 623 443 603 515 623 583 252 48 × 2 = 0 + 0.050 407 053 902 745 246 887 207 031 247 166 504 96;
  • 24) 0.050 407 053 902 745 246 887 207 031 247 166 504 96 × 2 = 0 + 0.100 814 107 805 490 493 774 414 062 494 333 009 92;
  • 25) 0.100 814 107 805 490 493 774 414 062 494 333 009 92 × 2 = 0 + 0.201 628 215 610 980 987 548 828 124 988 666 019 84;
  • 26) 0.201 628 215 610 980 987 548 828 124 988 666 019 84 × 2 = 0 + 0.403 256 431 221 961 975 097 656 249 977 332 039 68;
  • 27) 0.403 256 431 221 961 975 097 656 249 977 332 039 68 × 2 = 0 + 0.806 512 862 443 923 950 195 312 499 954 664 079 36;
  • 28) 0.806 512 862 443 923 950 195 312 499 954 664 079 36 × 2 = 1 + 0.613 025 724 887 847 900 390 624 999 909 328 158 72;
  • 29) 0.613 025 724 887 847 900 390 624 999 909 328 158 72 × 2 = 1 + 0.226 051 449 775 695 800 781 249 999 818 656 317 44;
  • 30) 0.226 051 449 775 695 800 781 249 999 818 656 317 44 × 2 = 0 + 0.452 102 899 551 391 601 562 499 999 637 312 634 88;
  • 31) 0.452 102 899 551 391 601 562 499 999 637 312 634 88 × 2 = 0 + 0.904 205 799 102 783 203 124 999 999 274 625 269 76;
  • 32) 0.904 205 799 102 783 203 124 999 999 274 625 269 76 × 2 = 1 + 0.808 411 598 205 566 406 249 999 998 549 250 539 52;
  • 33) 0.808 411 598 205 566 406 249 999 998 549 250 539 52 × 2 = 1 + 0.616 823 196 411 132 812 499 999 997 098 501 079 04;
  • 34) 0.616 823 196 411 132 812 499 999 997 098 501 079 04 × 2 = 1 + 0.233 646 392 822 265 624 999 999 994 197 002 158 08;
  • 35) 0.233 646 392 822 265 624 999 999 994 197 002 158 08 × 2 = 0 + 0.467 292 785 644 531 249 999 999 988 394 004 316 16;
  • 36) 0.467 292 785 644 531 249 999 999 988 394 004 316 16 × 2 = 0 + 0.934 585 571 289 062 499 999 999 976 788 008 632 32;
  • 37) 0.934 585 571 289 062 499 999 999 976 788 008 632 32 × 2 = 1 + 0.869 171 142 578 124 999 999 999 953 576 017 264 64;
  • 38) 0.869 171 142 578 124 999 999 999 953 576 017 264 64 × 2 = 1 + 0.738 342 285 156 249 999 999 999 907 152 034 529 28;
  • 39) 0.738 342 285 156 249 999 999 999 907 152 034 529 28 × 2 = 1 + 0.476 684 570 312 499 999 999 999 814 304 069 058 56;
  • 40) 0.476 684 570 312 499 999 999 999 814 304 069 058 56 × 2 = 0 + 0.953 369 140 624 999 999 999 999 628 608 138 117 12;
  • 41) 0.953 369 140 624 999 999 999 999 628 608 138 117 12 × 2 = 1 + 0.906 738 281 249 999 999 999 999 257 216 276 234 24;
  • 42) 0.906 738 281 249 999 999 999 999 257 216 276 234 24 × 2 = 1 + 0.813 476 562 499 999 999 999 998 514 432 552 468 48;
  • 43) 0.813 476 562 499 999 999 999 998 514 432 552 468 48 × 2 = 1 + 0.626 953 124 999 999 999 999 997 028 865 104 936 96;
  • 44) 0.626 953 124 999 999 999 999 997 028 865 104 936 96 × 2 = 1 + 0.253 906 249 999 999 999 999 994 057 730 209 873 92;
  • 45) 0.253 906 249 999 999 999 999 994 057 730 209 873 92 × 2 = 0 + 0.507 812 499 999 999 999 999 988 115 460 419 747 84;
  • 46) 0.507 812 499 999 999 999 999 988 115 460 419 747 84 × 2 = 1 + 0.015 624 999 999 999 999 999 976 230 920 839 495 68;
  • 47) 0.015 624 999 999 999 999 999 976 230 920 839 495 68 × 2 = 0 + 0.031 249 999 999 999 999 999 952 461 841 678 991 36;
  • 48) 0.031 249 999 999 999 999 999 952 461 841 678 991 36 × 2 = 0 + 0.062 499 999 999 999 999 999 904 923 683 357 982 72;
  • 49) 0.062 499 999 999 999 999 999 904 923 683 357 982 72 × 2 = 0 + 0.124 999 999 999 999 999 999 809 847 366 715 965 44;
  • 50) 0.124 999 999 999 999 999 999 809 847 366 715 965 44 × 2 = 0 + 0.249 999 999 999 999 999 999 619 694 733 431 930 88;
  • 51) 0.249 999 999 999 999 999 999 619 694 733 431 930 88 × 2 = 0 + 0.499 999 999 999 999 999 999 239 389 466 863 861 76;
  • 52) 0.499 999 999 999 999 999 999 239 389 466 863 861 76 × 2 = 0 + 0.999 999 999 999 999 999 998 478 778 933 727 723 52;
  • 53) 0.999 999 999 999 999 999 998 478 778 933 727 723 52 × 2 = 1 + 0.999 999 999 999 999 999 996 957 557 867 455 447 04;

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:


0.745 459 324 169 999 826 281 696 186 924 818 902 87(10) =

0.1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000 1(2)

5. Positive number before normalization:

1.745 459 324 169 999 826 281 696 186 924 818 902 87(10) =

1.1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000 1(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 0 positions to the left, so that only one non zero digit remains to the left of it:


1.745 459 324 169 999 826 281 696 186 924 818 902 87(10) =

1.1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000 1(2) =

1.1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000 1(2) × 20


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): 0

Mantissa (not normalized):
1.1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000 1


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

0 + 2(11-1) - 1 =

(0 + 1 023)(10) =

1 023(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;
  • 1 023 ÷ 2 = 511 + 1;
  • 511 ÷ 2 = 255 + 1;
  • 255 ÷ 2 = 127 + 1;
  • 127 ÷ 2 = 63 + 1;
  • 63 ÷ 2 = 31 + 1;
  • 31 ÷ 2 = 15 + 1;
  • 15 ÷ 2 = 7 + 1;
  • 7 ÷ 2 = 3 + 1;
  • 3 ÷ 2 = 1 + 1;
  • 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) =

1023(10) =

011 1111 1111(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. 1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000 1 =

1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000


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) =
011 1111 1111

Mantissa (52 bits) =
1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000


Decimal number 1.745 459 324 169 999 826 281 696 186 924 818 902 87 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 011 1111 1111 - 1011 1110 1101 0110 0110 1100 0001 1001 1100 1110 1111 0100 0000

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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