Pebibyte (PiB)

ComputingCurrent unit

Exactly 2⁵⁰ bytes (about 1.126 petabytes).

1 pebibyte = 1.125899907×10¹⁵ bytes (approximately).

1 pebibyte = 1.125899907×10¹⁵ bytes

About the pebibyte

Pebi was one of the two prefixes, with exbi, that the IEC added in January 1999 as Amendment 2 to IEC 60027-2, extending the set it approved in December 1998. The name keeps the first two letters of peta and appends bi for binary, and the symbol is PiB. It is a binary unit of exactly 2^50 bytes, or 1,125,899,906,842,624 bytes.

That is 1,024 tebibytes. Set against the decimal petabyte of 10^15 bytes, a pebibyte is about 12.6 percent larger, a gap that has grown with each prefix step from 2.4 percent at kilo. As a result, anyone who divides a 1 PB figure from a storage vendor by 2^50 will see about 0.89 PiB.

The pebibyte is useful where capacity is counted in powers of two and the exact size must be unambiguous. Wikipedia illustrates the petabyte scale as about 2,000 years of music in MP3 form.

Sources: Wikipedia: Binary prefix; Wikipedia: Byte; NIST: Prefixes for binary multiples

Pebibyte conversion chart

1 pebibyte expressed in every other digital storage unit:

Unit1 pebibyte
Bytes1.125899907×10¹⁵
Kilobytes1,125,899,906,843
Megabytes1,125,899,907
Gigabytes1,125,899.907
Terabytes1,125.899907
Bits9.007199255×10¹⁵
Petabytes1.125899907
Kibibytes1,099,511,627,776
Mebibytes1,073,741,824
Gibibytes1,048,576
Tebibytes1,024
Kilobits9,007,199,254,741
Megabits9,007,199,255
Gigabits9,007,199.255
Exabytes0.001125899907
Zettabytes0.000001125899907
Yottabytes1.125899907×10⁻⁹
Exbibytes0.0009765625
Terabits9,007.199255
Kibibits8,796,093,022,208
Mebibits8,589,934,592
Gibibits8,388,608
Nibbles2.251799814×10¹⁵

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