http://en.wikipedia.org/wiki/Data_rate_units#Kilobit_per_secondKilobit per second
A kilobit per second (kbit/s or kb/s) is a unit of data transfer rate equal to:
1,000 bits per second or
125 bytes per second.
[edit]Megabit per second
A megabit per second (Mbit/s or Mb/s; not to be confused with mbit/s which means millibit per second, or with Mbitps which means megabit picosecond) is a unit of data transfer rate equal to:
1,000,000 bits per second or
1,000 kilobits per second or
125,000 bytes per second or
125 kilobytes per second.
[edit]Gigabit per second
A gigabit per second (Gbit/s, or Gb/s) is a unit of data transfer rate equal to:
1,000 megabits per second or
1,000,000 kilobits per second or
1,000,000,000 bits per second or
125,000,000 bytes per second.
[edit]Terabit per second
A tera per second (Tbit/s, or Tb/s) is a unit of data transfer rate equal to:
1,000 gigabits per second or
1,000,000 megabits per second or
1,000,000,000 kilobits per second or
1,000,000,000,000 bits per second or
125,000,000,000 bytes per second.