Data Rate Converter Widget

Readers comparing a broadband plan with a download manager's MB/s figure, or a NAS's link speed with disk throughput, can convert any rate in bits per second to bytes per second (decimal or binary) and back, and see how long a gigabyte takes at that rate.

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How it works

The converter routes every rate through bits per second. Network and telecom rates are always decimal: 1 kbps is 1,000 bit/s, 1 Mbps a million and 1 Gbps a billion, which is how ISPs, Ethernet standards and Wi-Fi specifications quote them. Byte rates divide by eight; MB/s and GB/s are decimal, while KiB/s, MiB/s and GiB/s - which many download managers and operating systems display - use powers of 1,024 per the IEC binary prefixes. So a 100 Mbps line moves 12.5 MB/s but only 11.92 MiB/s, and gigabit Ethernet's 1 Gbps is 125 MB/s or 119.21 MiB/s. The result card adds a practical check - the time to move one gigabyte (8 gigabits) at the entered rate, 80 seconds at 100 Mbps - and the table lists the same rate in all twelve units. Swap reverses the direction. Remember these are raw line rates: protocol overhead makes delivered throughput lower.

Method

  • bit/s = value x factor(from); result = bit/s / factor(to)
  • Bit rates: kbps 10^3, Mbps 10^6, Gbps 10^9, Tbps 10^12 bit/s
  • Byte rates: B/s 8, kB/s 8 x 10^3, MB/s 8 x 10^6, GB/s 8 x 10^9; KiB/s 8 x 2^10, MiB/s 8 x 2^20, GiB/s 8 x 2^30 bit/s
  • Time for 1 GB = 8 x 10^9 / bit/s

Worked examples

Broadband plan

Inputs: 100 Mbps to MB/s

Result: 12.5 MB/s; 1 GB takes 80 s

100,000,000 / 8 = 12,500,000 B/s.

Gigabit Ethernet in binary units

Inputs: 1 Gbps to MiB/s

Result: 119.20929 MiB/s; 1 GB takes 8 s

10^9 / 8 / 1,048,576 = 119.209.

Limitations

  • Converts nominal rates; it does not subtract protocol overhead (use the download time calculator for that).
  • Units above Tbps and GiB/s are not offered.

Where publishers use it

  • An internet-provider page translating plan speeds into download-manager figures
  • A NAS or SSD review comparing interface speed with drive throughput
  • A video-streaming guide converting bitrates to data use per hour
  • A networking course module on bits versus bytes
  • A web-hosting knowledge base about bandwidth limits

Questions

How many MB/s is 100 Mbps?

12.5 MB/s: divide megabits by 8 to get megabytes. In binary units it is 11.92 MiB/s, which is what many download managers show.

Are network speeds decimal or binary?

Decimal. 1 Mbps is exactly 1,000,000 bits per second and 1 Gbps exactly 10^9; telecom standards never use 1,024. Binary prefixes appear only on byte rates shown by some software.

What does 1 Gbps Ethernet mean in MB/s?

1 Gbps / 8 = 125 MB/s, or 119.21 MiB/s. After TCP/IP framing, file copies typically reach somewhat less than that.

Why is the 'b' sometimes lower-case and sometimes capital?

Lower-case b means bits, capital B means bytes. Mbps or Mb/s is megabits per second; MBps or MB/s is megabytes per second - eight times more data.

How long does a gigabyte take at 20 Mbps?

8,000 megabits / 20 = 400 seconds, about 6.7 minutes, before overhead. The converter shows this time for any rate you enter.

Can I convert video bitrate to data per hour?

Convert the bitrate to MB/s and multiply by 3,600. A 5 Mbps stream is 0.625 MB/s, or 2.25 GB per hour.

Sources

  1. Prefixes for binary multiples - National Institute of Standards and Technology (NIST) . kibi (Ki) = 2^10 ... pebi (Pi) = 2^50, adopted by the IEC in 1999 (now IEC 80000-13); 1 MiB = 1,048,576 B while 1 MB = 1,000,000 B. Checked 2026-10-01.

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A2Z Tools Data Rate Converter
https://a2z.tools/embed/data-rate-converter

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