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The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB, but sometimes MByte is used. The unit prefix mega is a multiplier of 1000000 in the International System of Units . Therefore, one megabyte is one million bytes of information. This definition has been incorporated into the International System of Quantities.

Multiples of bytes
Decimal
Value Metric
1000 kB kilobyte
1000 MB megabyte
1000 GB gigabyte
1000 TB terabyte
1000 PB petabyte
1000 EB exabyte
1000 ZB zettabyte
1000 YB yottabyte
Binary
Value IEC JEDEC
1024 KiB kibibyte KB kilobyte
1024 MiB mebibyte MB megabyte
1024 GiB gibibyte GB gigabyte
1024 TiB tebibyte
1024 PiB pebibyte
1024 EiB exbibyte
1024 ZiB zebibyte
1024 YiB yobibyte

The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB, but sometimes MByte is used. The unit prefix mega is a multiplier of 1000000 (10) in the International System of Units (SI). Therefore, one megabyte is one million bytes of information. This definition has been incorporated into the International System of Quantities.

However, in the computer and information technology fields, several other definitions are used that arose for historical reasons of convenience. A common usage has been to designate one megabyte as 1048576bytes (2 B), a measurement that conveniently expresses the binary multiples inherent in digital computer memory architectures. However, most standards bodies have deprecated this usage in favor of a set of binary prefixes, in which this measurement is designated by the unit mebibyte (MiB). Less common is a measurement that used the megabyte to mean 1000×1024 (1024000) bytes.