Data Size¶

Metric

Value	Unit	Symbol	Notes
$1$	Byte	B	1 byte = 1 letter in computer memory
$10^{3}$	Kilobyte	kB	2 kB = RAM on original NES
$10^{6}$	Megabyte	MB	1 MB ≈ 1 HD quality photo
$10^{9}$	Gigabyte	GB	1 GB ≈ 114 minutes of uncompressed CD audio
$10^{12}$	Terabyte	TB	1.9 TB ≈ Size of all multimedia files used in English wikipedia on May 2012
$10^{15}$	Petabyte	PB	10 PB ≈ Size of Library of Congress collection in 2005
$10^{18}$	Exabyte	EB	15 EB ≈ storage space at Google data warehouse as of 2013
$10^{21}$	Zettabyte	ZB	6.9 ZB ≈ amount of data accessed by Americans in 2012
$10^{24}$	Yottabyte	YB	1 YB ≈ 131 TB for every person on Earth

Binary

Value	Unit	Symbol	Notes
$2^{10}$	Kibibyte	Ki	1024 bytes
$2^{20}$	Mebibyte	Mi	1024 kibibytes
$2^{30}$	Gibibyte	Gi	1024 mebibytes
$2^{40}$	Tebibyte	Ti	1024 gibibytes
$2^{50}$	Pebibyte	Pi	1024 tebibytes
$2^{60}$	Exbibyte	Ei	1024 pebibytes
$2^{70}$	Zebibyte	Zi	1024 exbibytes
$2^{80}$	Yobibyte	Yi	1024 zebibytes

Last update: March 12, 2023