Bytes to Megabits Converter

Bytes to Megabits

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

The Formula

`` megabits = bytes × 0.000008 bytes = megabits × 125000 `

One byte is 8.0000e-6 megabits, and one megabit is 125,000 bytes.

Conversion Table

Bytes	Megabits
1 B	8.0000e-6 Mb
2 B	1.6000e-5 Mb
5 B	4.0000e-5 Mb
10 B	8.0000e-5 Mb
25 B	2.0000e-4 Mb
50 B	4.0000e-4 Mb
100 B	8.0000e-4 Mb
500 B	0.004 Mb
1,000 B	0.008 Mb

The Other Direction

Megabits	Bytes
1 Mb	125,000 B
2 Mb	250,000 B
5 Mb	625,000 B
10 Mb	1,250,000 B
25 Mb	3,125,000 B
50 Mb	6,250,000 B
100 Mb	12,500,000 B
500 Mb	62,500,000 B
1,000 Mb	125,000,000 B

What Each Unit Is

Bytes (B) — 8 bits. Coined at IBM in 1956 for the group of bits encoding one character.

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

• One ASCII character is 1 byte
• A UTF-8 emoji is often 4 bytes
• HD streaming needs 5 Mbit/s
• 100 Mbit/s downloads at about 12.5 MB/s

Precision

The factor 0.000008 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 byteToMegabit = (value) => value * 0.000008; ``

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 B with the factor truncated at each decimal place:

Decimals kept	Factor	137 B becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0	0	100.0000%
3	0	0	100.0000%
4	0	0	100.0000%

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 bytes to three significant figures, the answer in megabits is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Bytes

The same value in every other unit this converter supports for data:

From	To	Unit
1 B	8 b	Bits
1 B	0.008 Kb	Kilobits
1 B	0.001 KB	Kilobytes
1 B	1.0000e-6 MB	Megabytes
1 B	1.0000e-9 GB	Gigabytes
1 B	1.0000e-12 TB	Terabytes

Chaining conversions works — bytes to metres to feet gives the same answer as bytes to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.