Megabits to Gigabytes Converter

Megabits to Gigabytes

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

The Formula

`` gigabytes = megabits × 0.000125 megabits = gigabytes × 8000 `

One megabit is 1.2500e-4 gigabytes, and one gigabyte is 8,000 megabits.

Conversion Table

Megabits	Gigabytes
1 Mb	1.2500e-4 GB
2 Mb	2.5000e-4 GB
5 Mb	6.2500e-4 GB
10 Mb	0.00125 GB
25 Mb	0.003125 GB
50 Mb	0.00625 GB
100 Mb	0.0125 GB
500 Mb	0.0625 GB
1,000 Mb	0.125 GB

The Other Direction

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

Gigabytes (GB) — 1,000,000,000 bytes in decimal usage. The unit of modern storage and mobile data plans.

A Sense of Scale

• HD streaming needs 5 Mbit/s
• 100 Mbit/s downloads at about 12.5 MB/s
• An HD film is 4–8 GB
• A phone ships with 128–512 GB

Precision

The factor 0.000125 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 megabitToGigabyte = (value) => value * 0.000125; ``

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	0	0	100.0000%
1	0	0	100.0000%
2	0	0	100.0000%
3	0	0	100.0000%
4	0.0001	0.0137	20.0000%

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 megabits to three significant figures, the answer in gigabytes 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	125,000 B	Bytes
1 Mb	1,000 Kb	Kilobits
1 Mb	125 KB	Kilobytes
1 Mb	0.125 MB	Megabytes
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.