1 Bit : 1 or 0
1 Nibble : 4 bits
1 Byte :  8 bits. ("A" is one byte)
Kilobyte (KB) : 1,024 bytes
Megabyte (MB) : 1,024 Kilobytes or 1024 x 1024 bytes
Gigabyte (GB) : 1,024 Megabytes or 1024 x 1024 x 1024 bytes
Terabyte (TB) :  1,024 Gigabytes, or 1024 x 1024  Megabytes
Petabyte (PB) : 1,024 Terabytes or 1,024 Gigabyes

How many bits in a 1 Megabyte ?
1024 x 1024  * 8

How many bits in a 1 Gigabyte ?
1024 x 1024 x 1024 * 8




Use this calculator to understand bit / byte calculations.