File size

File size measures the size of a computer file. Typically it is measured in bytes with an SI prefix. The actual amount of disk space consumed by the file depends on the file system. The maximum file size a file system supports depends on the number of bits reserved to store size information and the total size of the file system. For example, with FAT16X, the size of one file cannot be equal or larger than 4 GiB. Some common file size units are:

• 1 byte = 8 bit
• 1 KiB = 1,024 bytes
• 1 MiB = 1,048,576 bytes
• 1 GiB = 1,073,741,824 bytes
• 1 TiB = 1,099,511,627,776 bytes

Conversion table

Name	Symbol	Binary Measurement	Decimal Measurement	Number of Bytes	Equal to
Kilobyte	KB	210	103	1,024	(1,024) B
Megabyte	MB	220	106	1,048,576	(1,024) KB
Gigabyte	GB	230	109	1,073,741,824	(1,024) MB
Terabyte	TB	240	1012	1,099,511,627,776	(1,024) GB
Petabyte	PB	250	1015	1,125,899,906,842,624	(1,024) TB
Exabyte	EB	260	1018	1,152,921,504,606,846,976	(1,024) PB
Zettabyte	ZB	270	1021	1,180,591,620,717,411,303,424	(1,024) EB
Yottabyte	YB	280	1024	1,208,925,801,182,629,174,706,176	(1,024) ZB
Unconfirmed Sizes
Exonabyte	EB	290	1027	1,237,940,020,411,012,274,899,124,224	(1,024) YB
Mokuton Byte	?B	2100	1030	1,267,650,767,268,876,569,496,703,205,376	(1,024) EB
Higinia Byte	??B	2110	1033	1,298,074,385,683,329,607,164,624,082,305,024	(1,024) ?B
Xylobabyte	XB	2120	1036	1,329,228,170,939,729,517,736,575,060,280,344,576	(1,024) ??B
Katobyte	KTB	2130	1039	1,361,129,467,683,753,853,853,498,429,727,072,845,824	(1,024) XB
Extonabyte	EXT	Unknown	Unknown	1.393796574908163e+18	(1,024) KTB ( Note: This is my own term )