0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07(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
0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07(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: 0.
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;
  • 0 ÷ 2 = 0 + 0;

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.

0(10) =

0(2)


3. Convert to binary (base 2) the fractional part: 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07.

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) 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07 × 2 = 0 + 0.000 000 000 007 269 999 999 999 999 516 522 114 064 601 356 670 305 976 072 14;
  • 2) 0.000 000 000 007 269 999 999 999 999 516 522 114 064 601 356 670 305 976 072 14 × 2 = 0 + 0.000 000 000 014 539 999 999 999 999 033 044 228 129 202 713 340 611 952 144 28;
  • 3) 0.000 000 000 014 539 999 999 999 999 033 044 228 129 202 713 340 611 952 144 28 × 2 = 0 + 0.000 000 000 029 079 999 999 999 998 066 088 456 258 405 426 681 223 904 288 56;
  • 4) 0.000 000 000 029 079 999 999 999 998 066 088 456 258 405 426 681 223 904 288 56 × 2 = 0 + 0.000 000 000 058 159 999 999 999 996 132 176 912 516 810 853 362 447 808 577 12;
  • 5) 0.000 000 000 058 159 999 999 999 996 132 176 912 516 810 853 362 447 808 577 12 × 2 = 0 + 0.000 000 000 116 319 999 999 999 992 264 353 825 033 621 706 724 895 617 154 24;
  • 6) 0.000 000 000 116 319 999 999 999 992 264 353 825 033 621 706 724 895 617 154 24 × 2 = 0 + 0.000 000 000 232 639 999 999 999 984 528 707 650 067 243 413 449 791 234 308 48;
  • 7) 0.000 000 000 232 639 999 999 999 984 528 707 650 067 243 413 449 791 234 308 48 × 2 = 0 + 0.000 000 000 465 279 999 999 999 969 057 415 300 134 486 826 899 582 468 616 96;
  • 8) 0.000 000 000 465 279 999 999 999 969 057 415 300 134 486 826 899 582 468 616 96 × 2 = 0 + 0.000 000 000 930 559 999 999 999 938 114 830 600 268 973 653 799 164 937 233 92;
  • 9) 0.000 000 000 930 559 999 999 999 938 114 830 600 268 973 653 799 164 937 233 92 × 2 = 0 + 0.000 000 001 861 119 999 999 999 876 229 661 200 537 947 307 598 329 874 467 84;
  • 10) 0.000 000 001 861 119 999 999 999 876 229 661 200 537 947 307 598 329 874 467 84 × 2 = 0 + 0.000 000 003 722 239 999 999 999 752 459 322 401 075 894 615 196 659 748 935 68;
  • 11) 0.000 000 003 722 239 999 999 999 752 459 322 401 075 894 615 196 659 748 935 68 × 2 = 0 + 0.000 000 007 444 479 999 999 999 504 918 644 802 151 789 230 393 319 497 871 36;
  • 12) 0.000 000 007 444 479 999 999 999 504 918 644 802 151 789 230 393 319 497 871 36 × 2 = 0 + 0.000 000 014 888 959 999 999 999 009 837 289 604 303 578 460 786 638 995 742 72;
  • 13) 0.000 000 014 888 959 999 999 999 009 837 289 604 303 578 460 786 638 995 742 72 × 2 = 0 + 0.000 000 029 777 919 999 999 998 019 674 579 208 607 156 921 573 277 991 485 44;
  • 14) 0.000 000 029 777 919 999 999 998 019 674 579 208 607 156 921 573 277 991 485 44 × 2 = 0 + 0.000 000 059 555 839 999 999 996 039 349 158 417 214 313 843 146 555 982 970 88;
  • 15) 0.000 000 059 555 839 999 999 996 039 349 158 417 214 313 843 146 555 982 970 88 × 2 = 0 + 0.000 000 119 111 679 999 999 992 078 698 316 834 428 627 686 293 111 965 941 76;
  • 16) 0.000 000 119 111 679 999 999 992 078 698 316 834 428 627 686 293 111 965 941 76 × 2 = 0 + 0.000 000 238 223 359 999 999 984 157 396 633 668 857 255 372 586 223 931 883 52;
  • 17) 0.000 000 238 223 359 999 999 984 157 396 633 668 857 255 372 586 223 931 883 52 × 2 = 0 + 0.000 000 476 446 719 999 999 968 314 793 267 337 714 510 745 172 447 863 767 04;
  • 18) 0.000 000 476 446 719 999 999 968 314 793 267 337 714 510 745 172 447 863 767 04 × 2 = 0 + 0.000 000 952 893 439 999 999 936 629 586 534 675 429 021 490 344 895 727 534 08;
  • 19) 0.000 000 952 893 439 999 999 936 629 586 534 675 429 021 490 344 895 727 534 08 × 2 = 0 + 0.000 001 905 786 879 999 999 873 259 173 069 350 858 042 980 689 791 455 068 16;
  • 20) 0.000 001 905 786 879 999 999 873 259 173 069 350 858 042 980 689 791 455 068 16 × 2 = 0 + 0.000 003 811 573 759 999 999 746 518 346 138 701 716 085 961 379 582 910 136 32;
  • 21) 0.000 003 811 573 759 999 999 746 518 346 138 701 716 085 961 379 582 910 136 32 × 2 = 0 + 0.000 007 623 147 519 999 999 493 036 692 277 403 432 171 922 759 165 820 272 64;
  • 22) 0.000 007 623 147 519 999 999 493 036 692 277 403 432 171 922 759 165 820 272 64 × 2 = 0 + 0.000 015 246 295 039 999 998 986 073 384 554 806 864 343 845 518 331 640 545 28;
  • 23) 0.000 015 246 295 039 999 998 986 073 384 554 806 864 343 845 518 331 640 545 28 × 2 = 0 + 0.000 030 492 590 079 999 997 972 146 769 109 613 728 687 691 036 663 281 090 56;
  • 24) 0.000 030 492 590 079 999 997 972 146 769 109 613 728 687 691 036 663 281 090 56 × 2 = 0 + 0.000 060 985 180 159 999 995 944 293 538 219 227 457 375 382 073 326 562 181 12;
  • 25) 0.000 060 985 180 159 999 995 944 293 538 219 227 457 375 382 073 326 562 181 12 × 2 = 0 + 0.000 121 970 360 319 999 991 888 587 076 438 454 914 750 764 146 653 124 362 24;
  • 26) 0.000 121 970 360 319 999 991 888 587 076 438 454 914 750 764 146 653 124 362 24 × 2 = 0 + 0.000 243 940 720 639 999 983 777 174 152 876 909 829 501 528 293 306 248 724 48;
  • 27) 0.000 243 940 720 639 999 983 777 174 152 876 909 829 501 528 293 306 248 724 48 × 2 = 0 + 0.000 487 881 441 279 999 967 554 348 305 753 819 659 003 056 586 612 497 448 96;
  • 28) 0.000 487 881 441 279 999 967 554 348 305 753 819 659 003 056 586 612 497 448 96 × 2 = 0 + 0.000 975 762 882 559 999 935 108 696 611 507 639 318 006 113 173 224 994 897 92;
  • 29) 0.000 975 762 882 559 999 935 108 696 611 507 639 318 006 113 173 224 994 897 92 × 2 = 0 + 0.001 951 525 765 119 999 870 217 393 223 015 278 636 012 226 346 449 989 795 84;
  • 30) 0.001 951 525 765 119 999 870 217 393 223 015 278 636 012 226 346 449 989 795 84 × 2 = 0 + 0.003 903 051 530 239 999 740 434 786 446 030 557 272 024 452 692 899 979 591 68;
  • 31) 0.003 903 051 530 239 999 740 434 786 446 030 557 272 024 452 692 899 979 591 68 × 2 = 0 + 0.007 806 103 060 479 999 480 869 572 892 061 114 544 048 905 385 799 959 183 36;
  • 32) 0.007 806 103 060 479 999 480 869 572 892 061 114 544 048 905 385 799 959 183 36 × 2 = 0 + 0.015 612 206 120 959 998 961 739 145 784 122 229 088 097 810 771 599 918 366 72;
  • 33) 0.015 612 206 120 959 998 961 739 145 784 122 229 088 097 810 771 599 918 366 72 × 2 = 0 + 0.031 224 412 241 919 997 923 478 291 568 244 458 176 195 621 543 199 836 733 44;
  • 34) 0.031 224 412 241 919 997 923 478 291 568 244 458 176 195 621 543 199 836 733 44 × 2 = 0 + 0.062 448 824 483 839 995 846 956 583 136 488 916 352 391 243 086 399 673 466 88;
  • 35) 0.062 448 824 483 839 995 846 956 583 136 488 916 352 391 243 086 399 673 466 88 × 2 = 0 + 0.124 897 648 967 679 991 693 913 166 272 977 832 704 782 486 172 799 346 933 76;
  • 36) 0.124 897 648 967 679 991 693 913 166 272 977 832 704 782 486 172 799 346 933 76 × 2 = 0 + 0.249 795 297 935 359 983 387 826 332 545 955 665 409 564 972 345 598 693 867 52;
  • 37) 0.249 795 297 935 359 983 387 826 332 545 955 665 409 564 972 345 598 693 867 52 × 2 = 0 + 0.499 590 595 870 719 966 775 652 665 091 911 330 819 129 944 691 197 387 735 04;
  • 38) 0.499 590 595 870 719 966 775 652 665 091 911 330 819 129 944 691 197 387 735 04 × 2 = 0 + 0.999 181 191 741 439 933 551 305 330 183 822 661 638 259 889 382 394 775 470 08;
  • 39) 0.999 181 191 741 439 933 551 305 330 183 822 661 638 259 889 382 394 775 470 08 × 2 = 1 + 0.998 362 383 482 879 867 102 610 660 367 645 323 276 519 778 764 789 550 940 16;
  • 40) 0.998 362 383 482 879 867 102 610 660 367 645 323 276 519 778 764 789 550 940 16 × 2 = 1 + 0.996 724 766 965 759 734 205 221 320 735 290 646 553 039 557 529 579 101 880 32;
  • 41) 0.996 724 766 965 759 734 205 221 320 735 290 646 553 039 557 529 579 101 880 32 × 2 = 1 + 0.993 449 533 931 519 468 410 442 641 470 581 293 106 079 115 059 158 203 760 64;
  • 42) 0.993 449 533 931 519 468 410 442 641 470 581 293 106 079 115 059 158 203 760 64 × 2 = 1 + 0.986 899 067 863 038 936 820 885 282 941 162 586 212 158 230 118 316 407 521 28;
  • 43) 0.986 899 067 863 038 936 820 885 282 941 162 586 212 158 230 118 316 407 521 28 × 2 = 1 + 0.973 798 135 726 077 873 641 770 565 882 325 172 424 316 460 236 632 815 042 56;
  • 44) 0.973 798 135 726 077 873 641 770 565 882 325 172 424 316 460 236 632 815 042 56 × 2 = 1 + 0.947 596 271 452 155 747 283 541 131 764 650 344 848 632 920 473 265 630 085 12;
  • 45) 0.947 596 271 452 155 747 283 541 131 764 650 344 848 632 920 473 265 630 085 12 × 2 = 1 + 0.895 192 542 904 311 494 567 082 263 529 300 689 697 265 840 946 531 260 170 24;
  • 46) 0.895 192 542 904 311 494 567 082 263 529 300 689 697 265 840 946 531 260 170 24 × 2 = 1 + 0.790 385 085 808 622 989 134 164 527 058 601 379 394 531 681 893 062 520 340 48;
  • 47) 0.790 385 085 808 622 989 134 164 527 058 601 379 394 531 681 893 062 520 340 48 × 2 = 1 + 0.580 770 171 617 245 978 268 329 054 117 202 758 789 063 363 786 125 040 680 96;
  • 48) 0.580 770 171 617 245 978 268 329 054 117 202 758 789 063 363 786 125 040 680 96 × 2 = 1 + 0.161 540 343 234 491 956 536 658 108 234 405 517 578 126 727 572 250 081 361 92;
  • 49) 0.161 540 343 234 491 956 536 658 108 234 405 517 578 126 727 572 250 081 361 92 × 2 = 0 + 0.323 080 686 468 983 913 073 316 216 468 811 035 156 253 455 144 500 162 723 84;
  • 50) 0.323 080 686 468 983 913 073 316 216 468 811 035 156 253 455 144 500 162 723 84 × 2 = 0 + 0.646 161 372 937 967 826 146 632 432 937 622 070 312 506 910 289 000 325 447 68;
  • 51) 0.646 161 372 937 967 826 146 632 432 937 622 070 312 506 910 289 000 325 447 68 × 2 = 1 + 0.292 322 745 875 935 652 293 264 865 875 244 140 625 013 820 578 000 650 895 36;
  • 52) 0.292 322 745 875 935 652 293 264 865 875 244 140 625 013 820 578 000 650 895 36 × 2 = 0 + 0.584 645 491 751 871 304 586 529 731 750 488 281 250 027 641 156 001 301 790 72;
  • 53) 0.584 645 491 751 871 304 586 529 731 750 488 281 250 027 641 156 001 301 790 72 × 2 = 1 + 0.169 290 983 503 742 609 173 059 463 500 976 562 500 055 282 312 002 603 581 44;
  • 54) 0.169 290 983 503 742 609 173 059 463 500 976 562 500 055 282 312 002 603 581 44 × 2 = 0 + 0.338 581 967 007 485 218 346 118 927 001 953 125 000 110 564 624 005 207 162 88;
  • 55) 0.338 581 967 007 485 218 346 118 927 001 953 125 000 110 564 624 005 207 162 88 × 2 = 0 + 0.677 163 934 014 970 436 692 237 854 003 906 250 000 221 129 248 010 414 325 76;
  • 56) 0.677 163 934 014 970 436 692 237 854 003 906 250 000 221 129 248 010 414 325 76 × 2 = 1 + 0.354 327 868 029 940 873 384 475 708 007 812 500 000 442 258 496 020 828 651 52;
  • 57) 0.354 327 868 029 940 873 384 475 708 007 812 500 000 442 258 496 020 828 651 52 × 2 = 0 + 0.708 655 736 059 881 746 768 951 416 015 625 000 000 884 516 992 041 657 303 04;
  • 58) 0.708 655 736 059 881 746 768 951 416 015 625 000 000 884 516 992 041 657 303 04 × 2 = 1 + 0.417 311 472 119 763 493 537 902 832 031 250 000 001 769 033 984 083 314 606 08;
  • 59) 0.417 311 472 119 763 493 537 902 832 031 250 000 001 769 033 984 083 314 606 08 × 2 = 0 + 0.834 622 944 239 526 987 075 805 664 062 500 000 003 538 067 968 166 629 212 16;
  • 60) 0.834 622 944 239 526 987 075 805 664 062 500 000 003 538 067 968 166 629 212 16 × 2 = 1 + 0.669 245 888 479 053 974 151 611 328 125 000 000 007 076 135 936 333 258 424 32;
  • 61) 0.669 245 888 479 053 974 151 611 328 125 000 000 007 076 135 936 333 258 424 32 × 2 = 1 + 0.338 491 776 958 107 948 303 222 656 250 000 000 014 152 271 872 666 516 848 64;
  • 62) 0.338 491 776 958 107 948 303 222 656 250 000 000 014 152 271 872 666 516 848 64 × 2 = 0 + 0.676 983 553 916 215 896 606 445 312 500 000 000 028 304 543 745 333 033 697 28;
  • 63) 0.676 983 553 916 215 896 606 445 312 500 000 000 028 304 543 745 333 033 697 28 × 2 = 1 + 0.353 967 107 832 431 793 212 890 625 000 000 000 056 609 087 490 666 067 394 56;
  • 64) 0.353 967 107 832 431 793 212 890 625 000 000 000 056 609 087 490 666 067 394 56 × 2 = 0 + 0.707 934 215 664 863 586 425 781 250 000 000 000 113 218 174 981 332 134 789 12;
  • 65) 0.707 934 215 664 863 586 425 781 250 000 000 000 113 218 174 981 332 134 789 12 × 2 = 1 + 0.415 868 431 329 727 172 851 562 500 000 000 000 226 436 349 962 664 269 578 24;
  • 66) 0.415 868 431 329 727 172 851 562 500 000 000 000 226 436 349 962 664 269 578 24 × 2 = 0 + 0.831 736 862 659 454 345 703 125 000 000 000 000 452 872 699 925 328 539 156 48;
  • 67) 0.831 736 862 659 454 345 703 125 000 000 000 000 452 872 699 925 328 539 156 48 × 2 = 1 + 0.663 473 725 318 908 691 406 250 000 000 000 000 905 745 399 850 657 078 312 96;
  • 68) 0.663 473 725 318 908 691 406 250 000 000 000 000 905 745 399 850 657 078 312 96 × 2 = 1 + 0.326 947 450 637 817 382 812 500 000 000 000 001 811 490 799 701 314 156 625 92;
  • 69) 0.326 947 450 637 817 382 812 500 000 000 000 001 811 490 799 701 314 156 625 92 × 2 = 0 + 0.653 894 901 275 634 765 625 000 000 000 000 003 622 981 599 402 628 313 251 84;
  • 70) 0.653 894 901 275 634 765 625 000 000 000 000 003 622 981 599 402 628 313 251 84 × 2 = 1 + 0.307 789 802 551 269 531 250 000 000 000 000 007 245 963 198 805 256 626 503 68;
  • 71) 0.307 789 802 551 269 531 250 000 000 000 000 007 245 963 198 805 256 626 503 68 × 2 = 0 + 0.615 579 605 102 539 062 500 000 000 000 000 014 491 926 397 610 513 253 007 36;
  • 72) 0.615 579 605 102 539 062 500 000 000 000 000 014 491 926 397 610 513 253 007 36 × 2 = 1 + 0.231 159 210 205 078 125 000 000 000 000 000 028 983 852 795 221 026 506 014 72;
  • 73) 0.231 159 210 205 078 125 000 000 000 000 000 028 983 852 795 221 026 506 014 72 × 2 = 0 + 0.462 318 420 410 156 250 000 000 000 000 000 057 967 705 590 442 053 012 029 44;
  • 74) 0.462 318 420 410 156 250 000 000 000 000 000 057 967 705 590 442 053 012 029 44 × 2 = 0 + 0.924 636 840 820 312 500 000 000 000 000 000 115 935 411 180 884 106 024 058 88;
  • 75) 0.924 636 840 820 312 500 000 000 000 000 000 115 935 411 180 884 106 024 058 88 × 2 = 1 + 0.849 273 681 640 625 000 000 000 000 000 000 231 870 822 361 768 212 048 117 76;
  • 76) 0.849 273 681 640 625 000 000 000 000 000 000 231 870 822 361 768 212 048 117 76 × 2 = 1 + 0.698 547 363 281 250 000 000 000 000 000 000 463 741 644 723 536 424 096 235 52;
  • 77) 0.698 547 363 281 250 000 000 000 000 000 000 463 741 644 723 536 424 096 235 52 × 2 = 1 + 0.397 094 726 562 500 000 000 000 000 000 000 927 483 289 447 072 848 192 471 04;
  • 78) 0.397 094 726 562 500 000 000 000 000 000 000 927 483 289 447 072 848 192 471 04 × 2 = 0 + 0.794 189 453 125 000 000 000 000 000 000 001 854 966 578 894 145 696 384 942 08;
  • 79) 0.794 189 453 125 000 000 000 000 000 000 001 854 966 578 894 145 696 384 942 08 × 2 = 1 + 0.588 378 906 250 000 000 000 000 000 000 003 709 933 157 788 291 392 769 884 16;
  • 80) 0.588 378 906 250 000 000 000 000 000 000 003 709 933 157 788 291 392 769 884 16 × 2 = 1 + 0.176 757 812 500 000 000 000 000 000 000 007 419 866 315 576 582 785 539 768 32;
  • 81) 0.176 757 812 500 000 000 000 000 000 000 007 419 866 315 576 582 785 539 768 32 × 2 = 0 + 0.353 515 625 000 000 000 000 000 000 000 014 839 732 631 153 165 571 079 536 64;
  • 82) 0.353 515 625 000 000 000 000 000 000 000 014 839 732 631 153 165 571 079 536 64 × 2 = 0 + 0.707 031 250 000 000 000 000 000 000 000 029 679 465 262 306 331 142 159 073 28;
  • 83) 0.707 031 250 000 000 000 000 000 000 000 029 679 465 262 306 331 142 159 073 28 × 2 = 1 + 0.414 062 500 000 000 000 000 000 000 000 059 358 930 524 612 662 284 318 146 56;
  • 84) 0.414 062 500 000 000 000 000 000 000 000 059 358 930 524 612 662 284 318 146 56 × 2 = 0 + 0.828 125 000 000 000 000 000 000 000 000 118 717 861 049 225 324 568 636 293 12;
  • 85) 0.828 125 000 000 000 000 000 000 000 000 118 717 861 049 225 324 568 636 293 12 × 2 = 1 + 0.656 250 000 000 000 000 000 000 000 000 237 435 722 098 450 649 137 272 586 24;
  • 86) 0.656 250 000 000 000 000 000 000 000 000 237 435 722 098 450 649 137 272 586 24 × 2 = 1 + 0.312 500 000 000 000 000 000 000 000 000 474 871 444 196 901 298 274 545 172 48;
  • 87) 0.312 500 000 000 000 000 000 000 000 000 474 871 444 196 901 298 274 545 172 48 × 2 = 0 + 0.625 000 000 000 000 000 000 000 000 000 949 742 888 393 802 596 549 090 344 96;
  • 88) 0.625 000 000 000 000 000 000 000 000 000 949 742 888 393 802 596 549 090 344 96 × 2 = 1 + 0.250 000 000 000 000 000 000 000 000 001 899 485 776 787 605 193 098 180 689 92;
  • 89) 0.250 000 000 000 000 000 000 000 000 001 899 485 776 787 605 193 098 180 689 92 × 2 = 0 + 0.500 000 000 000 000 000 000 000 000 003 798 971 553 575 210 386 196 361 379 84;
  • 90) 0.500 000 000 000 000 000 000 000 000 003 798 971 553 575 210 386 196 361 379 84 × 2 = 1 + 0.000 000 000 000 000 000 000 000 000 007 597 943 107 150 420 772 392 722 759 68;
  • 91) 0.000 000 000 000 000 000 000 000 000 007 597 943 107 150 420 772 392 722 759 68 × 2 = 0 + 0.000 000 000 000 000 000 000 000 000 015 195 886 214 300 841 544 785 445 519 36;

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:


0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07(10) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2)

5. Positive number before normalization:

0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07(10) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 39 positions to the right, so that only one non zero digit remains to the left of it:


0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07(10) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2) × 20 =

1.1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010(2) × 2-39


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): -39

Mantissa (not normalized):
1.1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

-39 + 2(11-1) - 1 =

(-39 + 1 023)(10) =

984(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;
  • 984 ÷ 2 = 492 + 0;
  • 492 ÷ 2 = 246 + 0;
  • 246 ÷ 2 = 123 + 0;
  • 123 ÷ 2 = 61 + 1;
  • 61 ÷ 2 = 30 + 1;
  • 30 ÷ 2 = 15 + 0;
  • 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) =

984(10) =

011 1101 1000(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, only if necessary (not the case here).


Mantissa (normalized) =

1. 1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010 =

1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010


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 1101 1000

Mantissa (52 bits) =
1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010


Decimal number 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 152 988 036 07 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 011 1101 1000 - 1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010

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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