Bytes per second

Bit rates
Name	Symbol	Multiple
bit per second	bit/s	1	1
Decimal prefixes (SI)
kilobit per second	kbit/s	10³	1000¹
megabit per second	Mbit/s	10⁶	1000²
gigabit per second	Gbit/s	10⁹	1000³
terabit per second	Tbit/s	10¹²	1000⁴
Binary prefixes (IEC 80000-13)
kibibit per second	Kibit/s	2¹⁰	1024¹
mebibit per second	Mibit/s	2²⁰	1024²
gibibit per second	Gibit/s	2³⁰	1024³
tebibit per second	Tibit/s	2⁴⁰	1024⁴

In telecommunications, data transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or blocks per unit time passing between equipment in a data transmission system. Most commonly, measurements of data transfer rate are reported in multiples of unit bits per second (bit/s) or occasionally in bytes per second (B/s). The data rates of modern residential high-speed Internet connections are most commonly expressed in multiples of bits per second, such as megabits per second (Mbit/s) or kilobits per second (kbit/s).

The ISQ symbols for the bit and byte are bit and B, respectively. In the context of data rate units, one byte consists of 8 bits, and is synonymous with the unit octet. The abbreviation bps is often used to mean bit/s, so that when a 1 Mbps connection is advertised, it usually means that the maximum achievable bandwidth is 1 Mbit/s (one million bits per second), which is 0.125 MB/s (megabyte per second), or about 0.1192 MiB/s (mebibyte per second). The Institute of Electrical and Electronics Engineers (IEEE) uses the symbol b for bit.

In both the SI and ISQ, the prefix k stands for kilo, meaning 1,000, while Ki is the symbol for the binary prefix kibi-, meaning 1,024. The binary prefixes were introduced in 1998 by the International Electrotechnical Commission (IEC) and in IEEE 1541-2002 which was reaffirmed on 27 March 2008. The letter K is often used as a non-standard abbreviation for 1,024, especially in "KB" to mean KiB, the kilobyte in its binary sense.

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