Gigabytes to Megabits Converter

Gigabytes to Megabits

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

The Formula

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

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

Conversion Table

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

The Other Direction

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

What Each Unit Is

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

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

Precision

The factor 8000 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 gigabyteToMegabit = (value) => value * 8000; ``

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 GB with the factor truncated at each decimal place:

Decimals kept	Factor	137 GB becomes	Error
0	8000	1,096,000	—
1	8000	1,096,000	—
2	8000	1,096,000	—
3	8000	1,096,000	—
4	8000	1,096,000	—

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 gigabytes 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 Gigabytes

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

From	To	Unit
1 GB	8,000,000,000 b	Bits
1 GB	1,000,000,000 B	Bytes
1 GB	8,000,000 Kb	Kilobits
1 GB	1,000,000 KB	Kilobytes
1 GB	1,000 MB	Megabytes
1 GB	0.001 TB	Terabytes

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