File size

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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 FAT32, the size of one file cannot be equal or larger than 4 GiB. Some common file size units are:

• 1 byte = 8 bits
• 1 KiB = 1,024 bytes
• 1 MiB = 1,048,576 bytes^[1]
• 1 GiB = 1,073,741,824 bytes^[2]
• 1 TiB = 1,099,511,627,776 bytes^[3]

Name	Symbol	Equal to	Number of Bytes
Kilobyte	KB	(1,024) B	1,024
Megabyte	MB	(1,024) KB	1,048,576
Gigabyte	GB	(1,024) MB	1,073,741,824
Terabyte	TB	(1,024) GB	1,099,511,627,776
Petabyte	PB	(1,024) TB	1,125,899,906,842,624
Exabyte	EB	(1,024) PB	1,152,921,504,606,846,976
Zettabyte	ZB	(1,024) EB	1,180,591,620,717,411,303,424
Yottabyte	YB	(1,024) ZB	1,208,925,819,614,629,174,706,176