Units

The bits is the basic unit of information in computing and digital communications. A bit can have a value of either 0 or 1, representing the two binary states.

The octet, commonly known as a byte, consists of 8 bits. It is the standard unit used to measure data storage and memory capacity in computers.

Units

Units are often represented using 1000-based prefixes (SI prefixes) or 1024-based binary prefixes.

One exception is the KB (kilobyte) which is often used to represent 1024 bytes in computer science, despite being a 1000-based prefix (prefer not to use it).

SI Prefixes (1000-based)

Value	Power of 1000	Metric	Name
$10^{3}$	$1000$	kB	kilobyte
$10^{6}$	$1000^{2}$	MB	megabyte
$10^{9}$	$1000^{3}$	GB	gigabyte
$10^{12}$	$1000^{4}$	TB	terabyte
$10^{15}$	$1000^{5}$	PB	petabyte
$10^{18}$	$1000^{6}$	EB	exabyte
$10^{21}$	$1000^{7}$	ZB	zettabyte
$10^{24}$	$1000^{8}$	YB	yottabyte
$10^{27}$	$1000^{9}$	RB	ronnabyte
$10^{30}$	$1000^{10}$	QB	quettabyte

IEC Prefixes (1024-based)

Value	Power of 1024	IEC	Name
$2^{10}$	$1024$	KiB	kibibyte
$2^{20}$	$1024^{2}$	MiB	mebibyte
$2^{30}$	$1024^{3}$	GiB	gibibyte
$2^{40}$	$1024^{4}$	TiB	tebibyte
$2^{50}$	$1024^{5}$	PiB	pebibyte
$2^{60}$	$1024^{6}$	EiB	exbibyte
$2^{70}$	$1024^{7}$	ZiB	zebibyte
$2^{80}$	$1024^{8}$	YiB	yobibyte
$2^{90}$	$1024^{9}$	RiB	robibyte
$2^{100}$	$1024^{10}$	QiB	quebibyte