24.777 777 777 778 085 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 24.777 777 777 778 085(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
24.777 777 777 778 085(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: 24.
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;
  • 24 ÷ 2 = 12 + 0;
  • 12 ÷ 2 = 6 + 0;
  • 6 ÷ 2 = 3 + 0;
  • 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.

24(10) =

1 1000(2)


3. Convert to binary (base 2) the fractional part: 0.777 777 777 778 085.

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) 0.777 777 777 778 085 × 2 = 1 + 0.555 555 555 556 17;
  • 2) 0.555 555 555 556 17 × 2 = 1 + 0.111 111 111 112 34;
  • 3) 0.111 111 111 112 34 × 2 = 0 + 0.222 222 222 224 68;
  • 4) 0.222 222 222 224 68 × 2 = 0 + 0.444 444 444 449 36;
  • 5) 0.444 444 444 449 36 × 2 = 0 + 0.888 888 888 898 72;
  • 6) 0.888 888 888 898 72 × 2 = 1 + 0.777 777 777 797 44;
  • 7) 0.777 777 777 797 44 × 2 = 1 + 0.555 555 555 594 88;
  • 8) 0.555 555 555 594 88 × 2 = 1 + 0.111 111 111 189 76;
  • 9) 0.111 111 111 189 76 × 2 = 0 + 0.222 222 222 379 52;
  • 10) 0.222 222 222 379 52 × 2 = 0 + 0.444 444 444 759 04;
  • 11) 0.444 444 444 759 04 × 2 = 0 + 0.888 888 889 518 08;
  • 12) 0.888 888 889 518 08 × 2 = 1 + 0.777 777 779 036 16;
  • 13) 0.777 777 779 036 16 × 2 = 1 + 0.555 555 558 072 32;
  • 14) 0.555 555 558 072 32 × 2 = 1 + 0.111 111 116 144 64;
  • 15) 0.111 111 116 144 64 × 2 = 0 + 0.222 222 232 289 28;
  • 16) 0.222 222 232 289 28 × 2 = 0 + 0.444 444 464 578 56;
  • 17) 0.444 444 464 578 56 × 2 = 0 + 0.888 888 929 157 12;
  • 18) 0.888 888 929 157 12 × 2 = 1 + 0.777 777 858 314 24;
  • 19) 0.777 777 858 314 24 × 2 = 1 + 0.555 555 716 628 48;
  • 20) 0.555 555 716 628 48 × 2 = 1 + 0.111 111 433 256 96;
  • 21) 0.111 111 433 256 96 × 2 = 0 + 0.222 222 866 513 92;
  • 22) 0.222 222 866 513 92 × 2 = 0 + 0.444 445 733 027 84;
  • 23) 0.444 445 733 027 84 × 2 = 0 + 0.888 891 466 055 68;
  • 24) 0.888 891 466 055 68 × 2 = 1 + 0.777 782 932 111 36;
  • 25) 0.777 782 932 111 36 × 2 = 1 + 0.555 565 864 222 72;
  • 26) 0.555 565 864 222 72 × 2 = 1 + 0.111 131 728 445 44;
  • 27) 0.111 131 728 445 44 × 2 = 0 + 0.222 263 456 890 88;
  • 28) 0.222 263 456 890 88 × 2 = 0 + 0.444 526 913 781 76;
  • 29) 0.444 526 913 781 76 × 2 = 0 + 0.889 053 827 563 52;
  • 30) 0.889 053 827 563 52 × 2 = 1 + 0.778 107 655 127 04;
  • 31) 0.778 107 655 127 04 × 2 = 1 + 0.556 215 310 254 08;
  • 32) 0.556 215 310 254 08 × 2 = 1 + 0.112 430 620 508 16;
  • 33) 0.112 430 620 508 16 × 2 = 0 + 0.224 861 241 016 32;
  • 34) 0.224 861 241 016 32 × 2 = 0 + 0.449 722 482 032 64;
  • 35) 0.449 722 482 032 64 × 2 = 0 + 0.899 444 964 065 28;
  • 36) 0.899 444 964 065 28 × 2 = 1 + 0.798 889 928 130 56;
  • 37) 0.798 889 928 130 56 × 2 = 1 + 0.597 779 856 261 12;
  • 38) 0.597 779 856 261 12 × 2 = 1 + 0.195 559 712 522 24;
  • 39) 0.195 559 712 522 24 × 2 = 0 + 0.391 119 425 044 48;
  • 40) 0.391 119 425 044 48 × 2 = 0 + 0.782 238 850 088 96;
  • 41) 0.782 238 850 088 96 × 2 = 1 + 0.564 477 700 177 92;
  • 42) 0.564 477 700 177 92 × 2 = 1 + 0.128 955 400 355 84;
  • 43) 0.128 955 400 355 84 × 2 = 0 + 0.257 910 800 711 68;
  • 44) 0.257 910 800 711 68 × 2 = 0 + 0.515 821 601 423 36;
  • 45) 0.515 821 601 423 36 × 2 = 1 + 0.031 643 202 846 72;
  • 46) 0.031 643 202 846 72 × 2 = 0 + 0.063 286 405 693 44;
  • 47) 0.063 286 405 693 44 × 2 = 0 + 0.126 572 811 386 88;
  • 48) 0.126 572 811 386 88 × 2 = 0 + 0.253 145 622 773 76;
  • 49) 0.253 145 622 773 76 × 2 = 0 + 0.506 291 245 547 52;
  • 50) 0.506 291 245 547 52 × 2 = 1 + 0.012 582 491 095 04;
  • 51) 0.012 582 491 095 04 × 2 = 0 + 0.025 164 982 190 08;
  • 52) 0.025 164 982 190 08 × 2 = 0 + 0.050 329 964 380 16;
  • 53) 0.050 329 964 380 16 × 2 = 0 + 0.100 659 928 760 32;

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:


0.777 777 777 778 085(10) =

0.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000 0100 0(2)

5. Positive number before normalization:

24.777 777 777 778 085(10) =

1 1000.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000 0100 0(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 4 positions to the left, so that only one non zero digit remains to the left of it:


24.777 777 777 778 085(10) =

1 1000.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000 0100 0(2) =

1 1000.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000 0100 0(2) × 20 =

1.1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000 0100 0(2) × 24


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): 4

Mantissa (not normalized):
1.1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000 0100 0


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

4 + 2(11-1) - 1 =

(4 + 1 023)(10) =

1 027(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;
  • 1 027 ÷ 2 = 513 + 1;
  • 513 ÷ 2 = 256 + 1;
  • 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) =

1027(10) =

100 0000 0011(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. 1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000 0 1000 =

1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 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 0011

Mantissa (52 bits) =
1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 1000


Decimal number 24.777 777 777 778 085 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 100 0000 0011 - 1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 1100 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