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The gigabit per second is a multiple of the unit bit for Data Transfer Rate. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 1.0 × 109 (1 billion, short scale), and therefore 1 gigabit per second = 1.0 × 109 bit per second = 1000000000 bit per second. The gigabit per second has the unit symbol Gbit/s.
The kilobit per second is a the unit bit for data transfer rate. The prefix kilo- (symbol k) is defined in the International System of Units (SI) as a multiplier of 103 (1 thousand), and therefore, 1 kilobit / s = 103bits / s = 1000 bits / s.