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The gigabit is a multiple of the unit bit for digital information or computer storage. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 109 (1 billion, short scale), and therefore 1 gigabit = 109 bits = 1 000 000 000 bits.
The gigabit has the unit symbol Gbit or Gb.
The mebibit is a multiple of the bit, a unit of information, prefixed by the standards-based multiplier "mebi" (symbol Mi), a binary prefix meaning 220. The unit symbol of the mebibit is Mibit. 1 mebibit = 220 bits = 1 048 576 bits = 1024 kibibits