-0.016 738 891 601 562 496 530 549 57 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -0.016 738 891 601 562 496 530 549 57(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
-0.016 738 891 601 562 496 530 549 57(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:

|-0.016 738 891 601 562 496 530 549 57| = 0.016 738 891 601 562 496 530 549 57


2. 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;

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.

0(10) =

0(2)


4. Convert to binary (base 2) the fractional part: 0.016 738 891 601 562 496 530 549 57.

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) 0.016 738 891 601 562 496 530 549 57 × 2 = 0 + 0.033 477 783 203 124 993 061 099 14;
  • 2) 0.033 477 783 203 124 993 061 099 14 × 2 = 0 + 0.066 955 566 406 249 986 122 198 28;
  • 3) 0.066 955 566 406 249 986 122 198 28 × 2 = 0 + 0.133 911 132 812 499 972 244 396 56;
  • 4) 0.133 911 132 812 499 972 244 396 56 × 2 = 0 + 0.267 822 265 624 999 944 488 793 12;
  • 5) 0.267 822 265 624 999 944 488 793 12 × 2 = 0 + 0.535 644 531 249 999 888 977 586 24;
  • 6) 0.535 644 531 249 999 888 977 586 24 × 2 = 1 + 0.071 289 062 499 999 777 955 172 48;
  • 7) 0.071 289 062 499 999 777 955 172 48 × 2 = 0 + 0.142 578 124 999 999 555 910 344 96;
  • 8) 0.142 578 124 999 999 555 910 344 96 × 2 = 0 + 0.285 156 249 999 999 111 820 689 92;
  • 9) 0.285 156 249 999 999 111 820 689 92 × 2 = 0 + 0.570 312 499 999 998 223 641 379 84;
  • 10) 0.570 312 499 999 998 223 641 379 84 × 2 = 1 + 0.140 624 999 999 996 447 282 759 68;
  • 11) 0.140 624 999 999 996 447 282 759 68 × 2 = 0 + 0.281 249 999 999 992 894 565 519 36;
  • 12) 0.281 249 999 999 992 894 565 519 36 × 2 = 0 + 0.562 499 999 999 985 789 131 038 72;
  • 13) 0.562 499 999 999 985 789 131 038 72 × 2 = 1 + 0.124 999 999 999 971 578 262 077 44;
  • 14) 0.124 999 999 999 971 578 262 077 44 × 2 = 0 + 0.249 999 999 999 943 156 524 154 88;
  • 15) 0.249 999 999 999 943 156 524 154 88 × 2 = 0 + 0.499 999 999 999 886 313 048 309 76;
  • 16) 0.499 999 999 999 886 313 048 309 76 × 2 = 0 + 0.999 999 999 999 772 626 096 619 52;
  • 17) 0.999 999 999 999 772 626 096 619 52 × 2 = 1 + 0.999 999 999 999 545 252 193 239 04;
  • 18) 0.999 999 999 999 545 252 193 239 04 × 2 = 1 + 0.999 999 999 999 090 504 386 478 08;
  • 19) 0.999 999 999 999 090 504 386 478 08 × 2 = 1 + 0.999 999 999 998 181 008 772 956 16;
  • 20) 0.999 999 999 998 181 008 772 956 16 × 2 = 1 + 0.999 999 999 996 362 017 545 912 32;
  • 21) 0.999 999 999 996 362 017 545 912 32 × 2 = 1 + 0.999 999 999 992 724 035 091 824 64;
  • 22) 0.999 999 999 992 724 035 091 824 64 × 2 = 1 + 0.999 999 999 985 448 070 183 649 28;
  • 23) 0.999 999 999 985 448 070 183 649 28 × 2 = 1 + 0.999 999 999 970 896 140 367 298 56;
  • 24) 0.999 999 999 970 896 140 367 298 56 × 2 = 1 + 0.999 999 999 941 792 280 734 597 12;
  • 25) 0.999 999 999 941 792 280 734 597 12 × 2 = 1 + 0.999 999 999 883 584 561 469 194 24;
  • 26) 0.999 999 999 883 584 561 469 194 24 × 2 = 1 + 0.999 999 999 767 169 122 938 388 48;
  • 27) 0.999 999 999 767 169 122 938 388 48 × 2 = 1 + 0.999 999 999 534 338 245 876 776 96;
  • 28) 0.999 999 999 534 338 245 876 776 96 × 2 = 1 + 0.999 999 999 068 676 491 753 553 92;
  • 29) 0.999 999 999 068 676 491 753 553 92 × 2 = 1 + 0.999 999 998 137 352 983 507 107 84;
  • 30) 0.999 999 998 137 352 983 507 107 84 × 2 = 1 + 0.999 999 996 274 705 967 014 215 68;
  • 31) 0.999 999 996 274 705 967 014 215 68 × 2 = 1 + 0.999 999 992 549 411 934 028 431 36;
  • 32) 0.999 999 992 549 411 934 028 431 36 × 2 = 1 + 0.999 999 985 098 823 868 056 862 72;
  • 33) 0.999 999 985 098 823 868 056 862 72 × 2 = 1 + 0.999 999 970 197 647 736 113 725 44;
  • 34) 0.999 999 970 197 647 736 113 725 44 × 2 = 1 + 0.999 999 940 395 295 472 227 450 88;
  • 35) 0.999 999 940 395 295 472 227 450 88 × 2 = 1 + 0.999 999 880 790 590 944 454 901 76;
  • 36) 0.999 999 880 790 590 944 454 901 76 × 2 = 1 + 0.999 999 761 581 181 888 909 803 52;
  • 37) 0.999 999 761 581 181 888 909 803 52 × 2 = 1 + 0.999 999 523 162 363 777 819 607 04;
  • 38) 0.999 999 523 162 363 777 819 607 04 × 2 = 1 + 0.999 999 046 324 727 555 639 214 08;
  • 39) 0.999 999 046 324 727 555 639 214 08 × 2 = 1 + 0.999 998 092 649 455 111 278 428 16;
  • 40) 0.999 998 092 649 455 111 278 428 16 × 2 = 1 + 0.999 996 185 298 910 222 556 856 32;
  • 41) 0.999 996 185 298 910 222 556 856 32 × 2 = 1 + 0.999 992 370 597 820 445 113 712 64;
  • 42) 0.999 992 370 597 820 445 113 712 64 × 2 = 1 + 0.999 984 741 195 640 890 227 425 28;
  • 43) 0.999 984 741 195 640 890 227 425 28 × 2 = 1 + 0.999 969 482 391 281 780 454 850 56;
  • 44) 0.999 969 482 391 281 780 454 850 56 × 2 = 1 + 0.999 938 964 782 563 560 909 701 12;
  • 45) 0.999 938 964 782 563 560 909 701 12 × 2 = 1 + 0.999 877 929 565 127 121 819 402 24;
  • 46) 0.999 877 929 565 127 121 819 402 24 × 2 = 1 + 0.999 755 859 130 254 243 638 804 48;
  • 47) 0.999 755 859 130 254 243 638 804 48 × 2 = 1 + 0.999 511 718 260 508 487 277 608 96;
  • 48) 0.999 511 718 260 508 487 277 608 96 × 2 = 1 + 0.999 023 436 521 016 974 555 217 92;
  • 49) 0.999 023 436 521 016 974 555 217 92 × 2 = 1 + 0.998 046 873 042 033 949 110 435 84;
  • 50) 0.998 046 873 042 033 949 110 435 84 × 2 = 1 + 0.996 093 746 084 067 898 220 871 68;
  • 51) 0.996 093 746 084 067 898 220 871 68 × 2 = 1 + 0.992 187 492 168 135 796 441 743 36;
  • 52) 0.992 187 492 168 135 796 441 743 36 × 2 = 1 + 0.984 374 984 336 271 592 883 486 72;
  • 53) 0.984 374 984 336 271 592 883 486 72 × 2 = 1 + 0.968 749 968 672 543 185 766 973 44;
  • 54) 0.968 749 968 672 543 185 766 973 44 × 2 = 1 + 0.937 499 937 345 086 371 533 946 88;
  • 55) 0.937 499 937 345 086 371 533 946 88 × 2 = 1 + 0.874 999 874 690 172 743 067 893 76;
  • 56) 0.874 999 874 690 172 743 067 893 76 × 2 = 1 + 0.749 999 749 380 345 486 135 787 52;
  • 57) 0.749 999 749 380 345 486 135 787 52 × 2 = 1 + 0.499 999 498 760 690 972 271 575 04;
  • 58) 0.499 999 498 760 690 972 271 575 04 × 2 = 0 + 0.999 998 997 521 381 944 543 150 08;

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:


0.016 738 891 601 562 496 530 549 57(10) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 10(2)

6. Positive number before normalization:

0.016 738 891 601 562 496 530 549 57(10) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 10(2)

7. Normalize the binary representation of the number.

Shift the decimal mark 6 positions to the right, so that only one non zero digit remains to the left of it:


0.016 738 891 601 562 496 530 549 57(10) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 10(2) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 10(2) × 20 =

1.0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1110(2) × 2-6


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): -6

Mantissa (not normalized):
1.0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1110


9. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

-6 + 2(11-1) - 1 =

(-6 + 1 023)(10) =

1 017(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;
  • 1 017 ÷ 2 = 508 + 1;
  • 508 ÷ 2 = 254 + 0;
  • 254 ÷ 2 = 127 + 0;
  • 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;

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) =

1017(10) =

011 1111 1001(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, only if necessary (not the case here).


Mantissa (normalized) =

1. 0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1110 =

0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1110


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) =
011 1111 1001

Mantissa (52 bits) =
0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1110


Decimal number -0.016 738 891 601 562 496 530 549 57 converted to 64 bit double precision IEEE 754 binary floating point representation:

1 - 011 1111 1001 - 0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1110

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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