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File Size Conversion Table

Giga, mega, tera, kilo? What do they mean? Do you need to find out how many megabytes are in a petabyte, or home many decimal places a gigabyte holds? Use this quick reference chart to compare computer data file sizes.

The file size conversion table below shows the relationship between the file storage sizes that computers use. Binary calculations are based on units of 1,024, and decimal calculations are based on units of 1,000. It should be noted that decimal calculations are based on units that have been rounded off to the nearest 1,000 and therefore differ from the actual number of bytes used in binary calculations.

Name Symbol Binary
Measurement
Decimal
Measurement
Number of Bytes Equal to
kilobyte KB 2^10 10^3 1,024 1,024 bytes
megabyte MB 2^20 10^6 1,048,576 1,024KB
gigabyte GB 2^30 10^9 1,073,741,824 1,024MB
terabyte TB 2^40 10^12 1,099,511,627,776 1,024GB
petabyte PB 2^50 10^15 1,125,899,906,842,624 1,024TB
exabyte EB 2^60 10^18 1,152,921,504,606,846,976 1,024PB
zettabyte ZB 2^70 10^21 1,180,591,620,717,411,303,424 1,024EB
yottabyte YB 2^80 10^24 1,208,925,819,614,629,174,706,176 1,024ZB






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