-2.211 829 052 383 358 300 119 548 661 699 653 280 265 549 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -2.211 829 052 383 358 300 119 548 661 699 653 280 265 549(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
-2.211 829 052 383 358 300 119 548 661 699 653 280 265 549(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. Start with the positive version of the number:

|-2.211 829 052 383 358 300 119 548 661 699 653 280 265 549| = 2.211 829 052 383 358 300 119 548 661 699 653 280 265 549


2. First, convert to binary (in base 2) the integer part: 2.
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;
  • 2 ÷ 2 = 1 + 0;
  • 1 ÷ 2 = 0 + 1;

3. 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.

2(10) =

10(2)


4. Convert to binary (base 2) the fractional part: 0.211 829 052 383 358 300 119 548 661 699 653 280 265 549.

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) 0.211 829 052 383 358 300 119 548 661 699 653 280 265 549 × 2 = 0 + 0.423 658 104 766 716 600 239 097 323 399 306 560 531 098;
  • 2) 0.423 658 104 766 716 600 239 097 323 399 306 560 531 098 × 2 = 0 + 0.847 316 209 533 433 200 478 194 646 798 613 121 062 196;
  • 3) 0.847 316 209 533 433 200 478 194 646 798 613 121 062 196 × 2 = 1 + 0.694 632 419 066 866 400 956 389 293 597 226 242 124 392;
  • 4) 0.694 632 419 066 866 400 956 389 293 597 226 242 124 392 × 2 = 1 + 0.389 264 838 133 732 801 912 778 587 194 452 484 248 784;
  • 5) 0.389 264 838 133 732 801 912 778 587 194 452 484 248 784 × 2 = 0 + 0.778 529 676 267 465 603 825 557 174 388 904 968 497 568;
  • 6) 0.778 529 676 267 465 603 825 557 174 388 904 968 497 568 × 2 = 1 + 0.557 059 352 534 931 207 651 114 348 777 809 936 995 136;
  • 7) 0.557 059 352 534 931 207 651 114 348 777 809 936 995 136 × 2 = 1 + 0.114 118 705 069 862 415 302 228 697 555 619 873 990 272;
  • 8) 0.114 118 705 069 862 415 302 228 697 555 619 873 990 272 × 2 = 0 + 0.228 237 410 139 724 830 604 457 395 111 239 747 980 544;
  • 9) 0.228 237 410 139 724 830 604 457 395 111 239 747 980 544 × 2 = 0 + 0.456 474 820 279 449 661 208 914 790 222 479 495 961 088;
  • 10) 0.456 474 820 279 449 661 208 914 790 222 479 495 961 088 × 2 = 0 + 0.912 949 640 558 899 322 417 829 580 444 958 991 922 176;
  • 11) 0.912 949 640 558 899 322 417 829 580 444 958 991 922 176 × 2 = 1 + 0.825 899 281 117 798 644 835 659 160 889 917 983 844 352;
  • 12) 0.825 899 281 117 798 644 835 659 160 889 917 983 844 352 × 2 = 1 + 0.651 798 562 235 597 289 671 318 321 779 835 967 688 704;
  • 13) 0.651 798 562 235 597 289 671 318 321 779 835 967 688 704 × 2 = 1 + 0.303 597 124 471 194 579 342 636 643 559 671 935 377 408;
  • 14) 0.303 597 124 471 194 579 342 636 643 559 671 935 377 408 × 2 = 0 + 0.607 194 248 942 389 158 685 273 287 119 343 870 754 816;
  • 15) 0.607 194 248 942 389 158 685 273 287 119 343 870 754 816 × 2 = 1 + 0.214 388 497 884 778 317 370 546 574 238 687 741 509 632;
  • 16) 0.214 388 497 884 778 317 370 546 574 238 687 741 509 632 × 2 = 0 + 0.428 776 995 769 556 634 741 093 148 477 375 483 019 264;
  • 17) 0.428 776 995 769 556 634 741 093 148 477 375 483 019 264 × 2 = 0 + 0.857 553 991 539 113 269 482 186 296 954 750 966 038 528;
  • 18) 0.857 553 991 539 113 269 482 186 296 954 750 966 038 528 × 2 = 1 + 0.715 107 983 078 226 538 964 372 593 909 501 932 077 056;
  • 19) 0.715 107 983 078 226 538 964 372 593 909 501 932 077 056 × 2 = 1 + 0.430 215 966 156 453 077 928 745 187 819 003 864 154 112;
  • 20) 0.430 215 966 156 453 077 928 745 187 819 003 864 154 112 × 2 = 0 + 0.860 431 932 312 906 155 857 490 375 638 007 728 308 224;
  • 21) 0.860 431 932 312 906 155 857 490 375 638 007 728 308 224 × 2 = 1 + 0.720 863 864 625 812 311 714 980 751 276 015 456 616 448;
  • 22) 0.720 863 864 625 812 311 714 980 751 276 015 456 616 448 × 2 = 1 + 0.441 727 729 251 624 623 429 961 502 552 030 913 232 896;
  • 23) 0.441 727 729 251 624 623 429 961 502 552 030 913 232 896 × 2 = 0 + 0.883 455 458 503 249 246 859 923 005 104 061 826 465 792;
  • 24) 0.883 455 458 503 249 246 859 923 005 104 061 826 465 792 × 2 = 1 + 0.766 910 917 006 498 493 719 846 010 208 123 652 931 584;
  • 25) 0.766 910 917 006 498 493 719 846 010 208 123 652 931 584 × 2 = 1 + 0.533 821 834 012 996 987 439 692 020 416 247 305 863 168;
  • 26) 0.533 821 834 012 996 987 439 692 020 416 247 305 863 168 × 2 = 1 + 0.067 643 668 025 993 974 879 384 040 832 494 611 726 336;
  • 27) 0.067 643 668 025 993 974 879 384 040 832 494 611 726 336 × 2 = 0 + 0.135 287 336 051 987 949 758 768 081 664 989 223 452 672;
  • 28) 0.135 287 336 051 987 949 758 768 081 664 989 223 452 672 × 2 = 0 + 0.270 574 672 103 975 899 517 536 163 329 978 446 905 344;
  • 29) 0.270 574 672 103 975 899 517 536 163 329 978 446 905 344 × 2 = 0 + 0.541 149 344 207 951 799 035 072 326 659 956 893 810 688;
  • 30) 0.541 149 344 207 951 799 035 072 326 659 956 893 810 688 × 2 = 1 + 0.082 298 688 415 903 598 070 144 653 319 913 787 621 376;
  • 31) 0.082 298 688 415 903 598 070 144 653 319 913 787 621 376 × 2 = 0 + 0.164 597 376 831 807 196 140 289 306 639 827 575 242 752;
  • 32) 0.164 597 376 831 807 196 140 289 306 639 827 575 242 752 × 2 = 0 + 0.329 194 753 663 614 392 280 578 613 279 655 150 485 504;
  • 33) 0.329 194 753 663 614 392 280 578 613 279 655 150 485 504 × 2 = 0 + 0.658 389 507 327 228 784 561 157 226 559 310 300 971 008;
  • 34) 0.658 389 507 327 228 784 561 157 226 559 310 300 971 008 × 2 = 1 + 0.316 779 014 654 457 569 122 314 453 118 620 601 942 016;
  • 35) 0.316 779 014 654 457 569 122 314 453 118 620 601 942 016 × 2 = 0 + 0.633 558 029 308 915 138 244 628 906 237 241 203 884 032;
  • 36) 0.633 558 029 308 915 138 244 628 906 237 241 203 884 032 × 2 = 1 + 0.267 116 058 617 830 276 489 257 812 474 482 407 768 064;
  • 37) 0.267 116 058 617 830 276 489 257 812 474 482 407 768 064 × 2 = 0 + 0.534 232 117 235 660 552 978 515 624 948 964 815 536 128;
  • 38) 0.534 232 117 235 660 552 978 515 624 948 964 815 536 128 × 2 = 1 + 0.068 464 234 471 321 105 957 031 249 897 929 631 072 256;
  • 39) 0.068 464 234 471 321 105 957 031 249 897 929 631 072 256 × 2 = 0 + 0.136 928 468 942 642 211 914 062 499 795 859 262 144 512;
  • 40) 0.136 928 468 942 642 211 914 062 499 795 859 262 144 512 × 2 = 0 + 0.273 856 937 885 284 423 828 124 999 591 718 524 289 024;
  • 41) 0.273 856 937 885 284 423 828 124 999 591 718 524 289 024 × 2 = 0 + 0.547 713 875 770 568 847 656 249 999 183 437 048 578 048;
  • 42) 0.547 713 875 770 568 847 656 249 999 183 437 048 578 048 × 2 = 1 + 0.095 427 751 541 137 695 312 499 998 366 874 097 156 096;
  • 43) 0.095 427 751 541 137 695 312 499 998 366 874 097 156 096 × 2 = 0 + 0.190 855 503 082 275 390 624 999 996 733 748 194 312 192;
  • 44) 0.190 855 503 082 275 390 624 999 996 733 748 194 312 192 × 2 = 0 + 0.381 711 006 164 550 781 249 999 993 467 496 388 624 384;
  • 45) 0.381 711 006 164 550 781 249 999 993 467 496 388 624 384 × 2 = 0 + 0.763 422 012 329 101 562 499 999 986 934 992 777 248 768;
  • 46) 0.763 422 012 329 101 562 499 999 986 934 992 777 248 768 × 2 = 1 + 0.526 844 024 658 203 124 999 999 973 869 985 554 497 536;
  • 47) 0.526 844 024 658 203 124 999 999 973 869 985 554 497 536 × 2 = 1 + 0.053 688 049 316 406 249 999 999 947 739 971 108 995 072;
  • 48) 0.053 688 049 316 406 249 999 999 947 739 971 108 995 072 × 2 = 0 + 0.107 376 098 632 812 499 999 999 895 479 942 217 990 144;
  • 49) 0.107 376 098 632 812 499 999 999 895 479 942 217 990 144 × 2 = 0 + 0.214 752 197 265 624 999 999 999 790 959 884 435 980 288;
  • 50) 0.214 752 197 265 624 999 999 999 790 959 884 435 980 288 × 2 = 0 + 0.429 504 394 531 249 999 999 999 581 919 768 871 960 576;
  • 51) 0.429 504 394 531 249 999 999 999 581 919 768 871 960 576 × 2 = 0 + 0.859 008 789 062 499 999 999 999 163 839 537 743 921 152;
  • 52) 0.859 008 789 062 499 999 999 999 163 839 537 743 921 152 × 2 = 1 + 0.718 017 578 124 999 999 999 998 327 679 075 487 842 304;
  • 53) 0.718 017 578 124 999 999 999 998 327 679 075 487 842 304 × 2 = 1 + 0.436 035 156 249 999 999 999 996 655 358 150 975 684 608;

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).


5. 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:


0.211 829 052 383 358 300 119 548 661 699 653 280 265 549(10) =

0.0011 0110 0011 1010 0110 1101 1100 0100 0101 0100 0100 0110 0001 1(2)

6. Positive number before normalization:

2.211 829 052 383 358 300 119 548 661 699 653 280 265 549(10) =

10.0011 0110 0011 1010 0110 1101 1100 0100 0101 0100 0100 0110 0001 1(2)

7. 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:


2.211 829 052 383 358 300 119 548 661 699 653 280 265 549(10) =

10.0011 0110 0011 1010 0110 1101 1100 0100 0101 0100 0100 0110 0001 1(2) =

10.0011 0110 0011 1010 0110 1101 1100 0100 0101 0100 0100 0110 0001 1(2) × 20 =

1.0001 1011 0001 1101 0011 0110 1110 0010 0010 1010 0010 0011 0000 11(2) × 21


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): 1

Mantissa (not normalized):
1.0001 1011 0001 1101 0011 0110 1110 0010 0010 1010 0010 0011 0000 11


9. 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)


10. 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;

11. 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)


12. 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. 0001 1011 0001 1101 0011 0110 1110 0010 0010 1010 0010 0011 0000 11 =

0001 1011 0001 1101 0011 0110 1110 0010 0010 1010 0010 0011 0000


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

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

Exponent (11 bits) =
100 0000 0000

Mantissa (52 bits) =
0001 1011 0001 1101 0011 0110 1110 0010 0010 1010 0010 0011 0000


Decimal number -2.211 829 052 383 358 300 119 548 661 699 653 280 265 549 converted to 64 bit double precision IEEE 754 binary floating point representation:

1 - 100 0000 0000 - 0001 1011 0001 1101 0011 0110 1110 0010 0010 1010 0010 0011 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