Digital storage units
Digital information is measured in bits and bytes. One byte is 8 bits, and larger units build up in powers of 1024: a kilobyte (KB) is 1,024 bytes, a megabyte (MB) is 1,024 KB, a gigabyte (GB) is 1,024 MB, and so on up to terabytes (TB) and petabytes (PB). This converter uses that binary standard, which is how operating systems typically report file and disk sizes.
Binary vs decimal
Storage manufacturers sometimes use the decimal standard where 1 GB = 1,000 MB, which is why a "500 GB" drive can show as roughly 465 GB in your computer. This tool uses the binary (1024-based) convention for KB, MB, GB, TB and PB. Enter any value above to convert instantly.
Frequently asked questions
How many megabytes are in a gigabyte?
In the binary standard, 1 GB = 1024 MB. In the decimal (SI) standard it is 1000 MB.
How many bytes are in a kilobyte?
This converter uses the binary standard, where 1 KB = 1024 bytes.
How many bits are in a byte?
There are 8 bits in one byte.
How many gigabytes are in a terabyte?
1 TB = 1024 GB in the binary standard.