Megabytes to Megabits Converter

Megabytes to Megabits

Convert megabytes (MB) to megabits (Mb). Both measure digital storage, and the conversion comes up in computing, storage, internet work.

The Formula

`` megabits = megabytes × 8 megabytes = megabits × 0.125 `

One megabyte is 8 megabits, and one megabit is 0.125 megabytes.

Conversion Table

Megabytes	Megabits
1 MB	8 Mb
2 MB	16 Mb
5 MB	40 Mb
10 MB	80 Mb
25 MB	200 Mb
50 MB	400 Mb
100 MB	800 Mb
500 MB	4,000 Mb
1,000 MB	8,000 Mb

The Other Direction

Megabits	Megabytes
1 Mb	0.125 MB
2 Mb	0.25 MB
5 Mb	0.625 MB
10 Mb	1.25 MB
25 Mb	3.125 MB
50 Mb	6.25 MB
100 Mb	12.5 MB
500 Mb	62.5 MB
1,000 Mb	125 MB

What Each Unit Is

Megabytes (MB) — 1,000,000 bytes in decimal usage. The file-size unit of the CD-ROM era.

Megabits (Mb) — 1,000,000 bits. The unit internet plans are sold in — deliberately, because it makes the number eight times larger.

A Sense of Scale

• An MP3 is 3–5 MB
• A phone photo is 2–5 MB
• A JS bundle should stay under 1 MB
• HD streaming needs 5 Mbit/s
• 100 Mbit/s downloads at about 12.5 MB/s

Precision

The factor 8 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

Watch Out For

• Mb is megabits, MB is megabytes. A 100 Mbps connection delivers roughly 12.5 MB/s, not 100.

In Code

`javascript const megabyteToMegabit = (value) => value * 8; ``

Where This Conversion Comes Up

• Computing
• Storage
• Internet
• Media
• Backups

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 MB with the factor truncated at each decimal place:

Decimals kept	Factor	137 MB becomes	Error
0	8	1,096	—
1	8	1,096	—
2	8	1,096	—
3	8	1,096	—
4	8	1,096	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured megabytes to three significant figures, the answer in megabits is only good to three — writing more digits claims precision the measurement never had.