Data Transfer Rate converter

Bit per second (bps) is the reference unit here, and most of the other units are simple decimal multiples of it: a kilobit per second is 1,000 bps, a megabit per second is 1,000,000 bps, and so on up through terabit per second. The byte-based units carry an extra factor of 8 baked in, since one byte is eight bits — a byte per second equals 8 bps, and a megabyte per second equals 8,000,000 bps.

The pair people convert most often is megabit per second to megabyte per second. Divide the Mbps factor (1,000,000) by the MB/s factor (8,000,000) to get: MB/s = Mbps × 0.125. Reverse it by multiplying by 8 instead, the same factor of eight that separates a bit from a byte everywhere in computing.

An internet plan advertised at 100 Mbps tops out at 100 × 0.125 = 12.5 MB/s in a download manager, which is why a "100 meg" connection never seems to hit 100 in your browser's download speed display. A faster 1 Gbps (gigabit) line converts to 1,000 × 0.125 = 125 MB/s theoretical maximum, though real-world throughput usually lands lower once protocol overhead is accounted for.

Internet service providers, mobile carriers and network hardware specs almost always advertise speed in bits per second, because that's how the underlying signal is measured and because bigger numbers market better. File managers, download clients and cloud storage dashboards show byte-based rates instead, since file sizes themselves are measured in bytes. Hardware standards split the same way: Ethernet and USB ratings, such as 10BASE-T, Gigabit Ethernet, USB 2.0 and USB 3.0, are all specified in bits per second, matching the physical signaling rate of the cable or port.

The classic error is comparing an ISP's advertised Mbps figure directly against a download manager's MB/s reading and concluding the connection is broken or throttled. They're measuring the same link in units that differ by a factor of 8, not two different speeds. A second subtlety: USB and Ethernet port speeds, like USB 3.0's 5 Gbps or Gigabit Ethernet's 1000BASE-T, describe the theoretical signaling rate, not the sustained real-world transfer rate, which is always somewhat lower once overhead, cabling quality and device limitations are factored in.

Kibibyte and mebibyte per second (KiB/s, MiB/s) appear in this list because some file transfer tools, particularly on Linux and in older FTP clients, report binary rather than decimal byte rates. A transfer showing "1,024 KiB/s" is reporting the same underlying speed as one showing "1.049 MB/s," just measured against a power-of-two scale instead of a power-of-ten one.