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There are actually two answers to this, depending on what method you want to use to determine the answer.

Standard definitionThe standard definition for kilobyte is 1,000 (103) bytes, just like there are 1,000 meters in a kilometer.

Likewise, the standard definition for gigabyte is 1,000,000,000 (109) bytes. Dividing, this means there are 1,000,000 (1 million) kilobytes in a gigabyte.

This is the definition used for hard drives, portable memory drives (memory cards, USB drives), DVDs, Blu-ray disks, and most measures of performance. Some software (such as Mac OS X and the Linux kernel) uses this definition when displaying file and disk sizes.

Memory manufacturer definitionMemory manufacturers use a non-standard system that conflicts with the way everyone else measures. By their definition, a kilobyte (written "KB") is 1,024 (210) bytes, and a gigabyte (written "GB") is 1,073,741,824 (230) bytes.

The correct name for 1,024 bytes is "kilobinary byte" or "kibibyte". The correct name for 1,073,741,824 bytes is "gigabinary byte" or "gibibyte".

This is approximately equal to the above, but you may need to know it to figure out exact numbers:

By this definition, 1 "GB" = 1,048,576 "KB"

This definition is used by memory manufacturers and some software, like Microsoft Windows.

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14y ago

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