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Megabits per second to megabytes per second converter

Convert megabits per second to megabytes per second (Mbps to MB/s) with the exact factor, a conversion chart and worked steps.

Drafted with AI writing toolsUpdated Checked examples: 3

Mbit/s
Try
Megabytes per second
MB/s
Megabytes per second: 12.5 MB/s
Significant figures: 12; Nearest, ties away from zero
Conversion
100 Mbit/s = 12.5 MB/s
1 MB/s in megabits per second
8Mbit/s

100 Mbit/s is about 12.5 MB/s. In the other direction, 1 MB/s ≈ 8 Mbit/s.

Megabits per second to megabytes per second

05001,0002,0004,0006,0008,00010,000Mbit/sMB/s100 → 12.5
Mbps to MB/s chart Rows: 10
Megabits per secondMegabytes per second
101.25
253.125
506.25
10012.5
20025
30037.5
50062.5
1000125
2500312.5
100001,250
How it's calculated S

  1. Conversion factor

    1 Mbit/s=0.125 MB/s1\ \text{Mbit/s} = 0.125\ \text{MB/s}

    Exact by definition.

  2. Multiply

    100×0.125=12.5 MB/s100 \times 0.125 = 12.5\ \text{MB/s}

About the megabits per second to megabytes per second converter

To convert megabits per second to megabytes per second, multiply by 0.125; to convert back, multiply by 8. For example, 100 Mbit/s is about 12.5 MB/s. Displayed factors and results may be rounded.

An internet plan's megabits per second can be compared with a download display in megabytes per second. Eight bits make a byte, but protocol overhead and congestion can reduce the observed transfer rate. Do not treat the converted line rate as a guaranteed download speed.

Internet speeds are quoted in megabits per second; there are 8 bits in a byte.

Both units are defined exactly. Calculations use 50 significant digits and round only for display.

How to convert Mbps to MB/s

Divide the megabits per second by 8: MB/s = Mbps ÷ 8. A 100 Mbps internet plan moves at most 12.5 MB/s, and a 1,000 Mbps (gigabit) line moves 125 MB/s. Use it to compare a plan's advertised speed, sold in bits, with the MB/s figure a browser or download manager shows.

Why divide by 8?

A byte is 8 bits. Both units use decimal prefixes, a million bits in a megabit and a million bytes in a megabyte, so the millions cancel and only the 8 is left (NIST).

The letter case carries the meaning: a lowercase b is bits (Mbps, Mb/s) and a capital B is bytes (MB/s, MBps).

Mbps to MB/s chart

Megabits per secondMegabytes per second
101.25
253.125
506.25
10012.5
30037.5
1000125

Why real downloads are a little slower

Part of every packet is headers instead of file data. TCP/IPv4 over Ethernet uses about 5% this way, so a 100 Mbps line delivers roughly 11.9 MB/s of file data. Wi-Fi signal, the server's own limit and other devices on the line can lower it further.

At the full line rate, a 1 GB file takes 80 seconds at 100 Mbps (8,000 megabits ÷ 100); with 5% overhead it takes about 84 seconds. The download time calculator works this out for any size and speed.

MB/s or MiB/s?

A program that reports MiB/s counts binary megabytes of 1,048,576 bytes. The same 100 Mbps is 12.5 MB/s but about 11.92 MiB/s, so a slightly lower reading there is not a slower line.

Common mistakes

  • Expecting 100 MB/s from a 100 Mbps plan. Downloading at 100 MB/s needs 800 Mbps.
  • Multiplying instead of dividing. 100 Mbps is 12.5 MB/s, not 800 MB/s. Multiply by 8 only to go from MB/s back to Mbps.
  • Using the download speed for uploads. On asymmetric lines such as ADSL the upload speed is lower, so convert the plan's upload figure separately.
  • Treating Mb as a speed. A size in megabits has no per-second part; convert it with the data storage converter.

The data transfer rate converter covers Gbps, kbps, MiB/s and the reverse direction. To see how much data a link moves in a set time, try the bandwidth calculator.

Worked examples

100 Mbit/s to MB/s

Megabits per second (Mbit/s)
100 Mbit/s
Megabytes per second
12.5 MB/s

Checked against: Exact-fraction computation from the legal unit definitions

2500 Mbit/s to MB/s

Megabits per second (Mbit/s)
2500 Mbit/s
Megabytes per second
312.5 MB/s

Checked against: Exact-fraction computation from the legal unit definitions

10 Mbit/s to MB/s

Megabits per second (Mbit/s)
10 Mbit/s
Megabytes per second
1.25 MB/s

Checked against: Exact-fraction computation from the legal unit definitions

Questions

How many megabytes per second is one megabit per second?

1 Mbit/s is about 0.125 MB/s. Internet speeds are quoted in megabits per second; there are 8 bits in a byte.

How do I convert megabits per second to megabytes per second?

Multiply by 0.125: 100 Mbit/s × 0.125 ≈ 12.5 MB/s. To convert back, divide by the same factor. The factor shown may be rounded.

About this calculator

MB/s=Mbit/s×0.125\text{MB/s} = \text{Mbit/s} \times 0.125

Sources

  1. NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B
  2. NIST Handbook 44, Appendix C: General tables of units of measurement
  3. BIPM, The International System of Units (SI Brochure), 9th edition

Checked against references

This calculator includes 3 worked examples with independently sourced answers. They run in the test suite, and you can run them here too.

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