A kibibyte (KiB), derived from kilo-binary, 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.

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.