Memory Units Chart Memory Unit Description NIBBLE In one NIBBLE there are 4 bits. Byte In one byte there are 8 bits. Word In one word there can be from 8 bits to 96 bits. Kilobyte (KB) In one Kilobyte there are 1024 bytes. Megabyte (MB) In one Megabyte there are 1024 Kilobytes. Gigabyte (GB) In one Gigabyte there are 1024 Megabytes Terabyte (TB) In one Terabyte (TB) there are 1024 Gigabytes (GB) Petabyte (PB) In one Petabyte there are 1024 Terabyte Exabyte (EB) In one Exabyte has 1024 Petabytes Zettabyte (ZB) There are 1024 Exabyte in a Zettabyte. Yottabyte (YB) There are 1024 Zettabytes in a Yottabyte.