Unit of Digital Information Storage
Kibibyte	210 Bytes 1024 Bytes
SI	IEC
Decimal	Binary
kilobyte kB 103 megabyte MB 106 gigabyte GB 109 terabyte TB 1012 petabyte PB 1015 exabyte EB 1018 zettabyte ZB 1021 yottabyte YB 1024	kibibyte KiB 210 mebibyte MiB 220 gibibyte GiB 230 tebibyte TiB 240 pebibyte PiB 250 exbibyte EiB 260 zebibyte ZiB 270 yobibyte YiB 280
(larger units were proposed but have not yet formally been adopted by the BIPM)

A kibibyte (KiB), derived from kilo-binary-byte, is a unit of digital information storage equal to 1024 bytes. This is in contrast to a kilobyte, meaning 1000 bytes. The unit was established by the International Electrotechnical Commission in 1998 to differentiate units in base 10 from units in base 2. IEC formally added it to IEC 60027-2 which was later superseded by IEC 80000-13.

Examples

• A typical L1I$ and L1D$ is between 8 and 64 KiB. For example, AMD's K5 had 16 KiB L1 instruction cache and 8 KiB data cache.
• A typical L2$ is between 64 and 512 KiB. For example Intel's Haswell had 256 KiB of L2 cache.
• A 16-bit CPU cannot directly address more than 64 KiB.