Megabits to Bytes Converter

Megabits to Bytes

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

The Formula

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

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

Conversion Table

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

The Other Direction

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

What Each Unit Is

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

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

A Sense of Scale

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

Precision

The factor 125000 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 megabitToByte = (value) => value * 125000; ``

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	125000	17,125,000	—
1	125000	17,125,000	—
2	125000	17,125,000	—
3	125000	17,125,000	—
4	125000	17,125,000	—

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

Other Conversions From Megabits

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

From	To	Unit
1 Mb	1,000,000 b	Bits
1 Mb	1,000 Kb	Kilobits
1 Mb	125 KB	Kilobytes
1 Mb	0.125 MB	Megabytes
1 Mb	1.2500e-4 GB	Gigabytes
1 Mb	1.2500e-7 TB	Terabytes

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