How do you convert gigabytes to megabits?

To convert gigabytes (GB) to megabits (Mb), multiply the data size in gigabytes by 8,000 (megabits = gigabytes × 8,000).

What is 5 gigabytes in megabits?

5 gigabytes (5 GB) is equal to 40,000 megabits (40,000 Mb).

Which is larger, 1 gigabyte (decimal) (GB) or 1 megabit (Mb)?

One gigabyte (decimal) (GB) is larger than one megabit (Mb). Specifically, 1 GB contains 8,000 Mb, whereas 1 Mb is 0.000125 GB.

How do I convert back from megabits (Mb) to gigabytes (GB)?

To reverse the calculation from Mb to GB, multiply your megabit value by the inverse factor 0.000125 (or divide by 8,000). You can also click the Swap button in the tool above to flip directions in one click.

Are there regional or standard differences when converting GB and Mb?

Decimal SI (Base-10) vs. Binary IEC (Base-2) & Bits vs. Bytes: Networking speeds and storage drive manufacturers use SI decimal prefixes (1 kB = 1,000 bytes, 1 MB = 1,000,000 bytes, 1 GB = 10⁹ bytes), whereas operating systems and RAM often report binary IEC prefixes (1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes, 1 GiB = 1,073,741,824 bytes). Also note that lowercase 'b' denotes bits while uppercase 'B' denotes Bytes (1 Byte = 8 bits).

Gigabytes to Megabits Converter

Enter the data size in gigabytes below to convert it to megabits.

Megabits to Gigabytes (Mb → GB)

Convert Gigabytes to Megabits

Enter a value in gigabytes (GB) to convert to megabits (Mb).

Value (GB)

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40,000megabits

5 GB = 40,000 Mb

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Suggested Conversions

Reference:NIST / IEC (IEC 80000-13 Binary Prefixes)

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Gigabyte to Megabit Conversion Table

Table showing various gigabyte measurements converted to megabits. Click any preset value or arrow to load it into the converter.

Gigabytes (GB)	Megabits (Mb)
1 GB	8,000 Mb
2 GB	16,000 Mb
2.5 GB	20,000 Mb
5 GB	40,000 Mb
10 GB	80,000 Mb
15 GB	120,000 Mb
20 GB	160,000 Mb
25 GB	200,000 Mb
30 GB	240,000 Mb
50 GB	400,000 Mb

How to Convert Gigabytes to Megabits

To convert gigabytes to megabits, multiply the data size by the following conversion ratio: 8,000 megabits/gigabyte.

Since one gigabyte is equal to 8,000 megabits, you can use this simple formula to convert:

megabits = gigabytes × 8,000

The data size in megabits is equal to the data size in gigabytes multiplied by 8,000.

For example, here's how to convert 5 gigabytes to megabits using the formula above.

megabits = (5 GB × 8,000) = 40,000 Mb

How Many Megabits Are in a Gigabyte?

There are 8,000 megabits in a gigabyte, which is why we use this value in the formula above.

1 GB = 8,000 Mb|1 Mb = 0.000125 GB

Our gigabyte to megabit calculator automatically converts your data size measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Gigabytes and megabits are both units used to measure data size. Keep reading to learn more about each unit.

What Is a Gigabyte?

A gigabyte is a unit of data size equal to 1,000,000,000 bytes (B), the base unit for data size. SI decimal standard: 1,000,000,000 bytes. [1]

The gigabyte is classified as a metric and SI-compatible unit of data size. Gigabytes can be abbreviated as GB; for example, 1 gigabyte can be written as 1 GB.

In the metric system, "giga" is the standard SI prefix for billions, or 10⁹. This makes the gigabyte (GB) a convenient decimal multiple of the byte (B).

In practice, gigabytes (GB) are widely used across large-scale industrial, bulk, and macro-level data size specifications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about gigabytes in our Digital Storage Converter.

What Is a Megabit?

A megabit is a unit of data size equal to 125,000 bytes (B), the base unit for data size. Equal to 1,000,000 bits (125 KB). [2]

The megabit is classified as a metric and SI-compatible unit of data size. Megabits can be abbreviated as Mb; for example, 1 megabit can be written as 1 Mb.

In the metric system, "mega" is the standard SI prefix for millions, or 10⁶. This makes the megabit (Mb) a convenient decimal multiple of the byte (B).

In practice, megabits (Mb) are widely used across large-scale industrial, bulk, and macro-level data size specifications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about megabits in our Digital Storage Converter.

When converting data size between gigabytes (GB) and megabits (Mb), keep full floating-point precision (1 GB = 8,000 Mb; 1 Mb = 0.000125 GB) during intermediate calculations and round only the final megabit figure to match your instrument tolerance.

More Gigabyte & Megabit Conversions

Need to calculate in the opposite direction? Use our megabits to gigabytes calculator to switch your starting unit immediately. You can also explore related tools such as converting megabits to gigabytes, converting gigabytes to terabytes, or converting gigabytes to megabytes.

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Frequently Asked Questions

There are 8,000 megabits (Mb) in 1 gigabyte (GB). Conversely, 1 megabit (Mb) is equal to 0.000125 gigabytes (GB).

Digital Storage Converter

Quick Info

Direct Factor: 1 gigabyte (decimal) (GB) equals 8,000 megabits (Mb).
Inverse Factor: 1 megabit (Mb) equals 0.000125 gigabytes (GB).
Formula: megabits = gigabytes × 8,000.
Standard Note: Decimal SI (Base-10) vs. Binary IEC (Base-2) & Bits vs. Bytes: Networking speeds and storage drive manufacturers use SI decimal prefixes (1 kB = 1,000 bytes, 1 MB = 1,000,000 bytes, 1 GB = 10⁹ bytes), whereas operating systems and RAM often report binary IEC prefixes (1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes, 1 GiB = 1,073,741,824 bytes). Also note that lowercase 'b' denotes bits while uppercase 'B' denotes Bytes (1 Byte = 8 bits).

Units Comparison

Gigabyte (Decimal) (GB)

SI decimal standard: 1,000,000,000 bytes.

Megabit (Mb)

Equal to 1,000,000 bits (125 KB).

Byte (B)

8 binary bits.

References

[1]NIST / IEC · IEC 80000-13 Binary Prefixes
Source
[2]BIPM · SI Decimal Prefixes (k, M, G, T, P)
Source
[3]NIST CUU · SI Prefixes & Decimal Multiples
Source

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References

NIST · BIPM · ISO

[1]
NIST / IEC (IEC 80000-13 Binary Prefixes)·Digital Storage Metrology Standard — Gigabytes (GB) to Megabits (Mb)
NIST / IEC Standard
[2]
BIPM (SI Decimal Prefixes (k, M, G, T, P))·Unit Specifications: Gigabyte (Decimal) (GB) & Megabit (Mb)
BIPM Specification
[3]
NIST CUU (SI Prefixes & Decimal Multiples)·Conversion Factors & Mathematical Basis (GB to Mb)
NIST CUU Reference

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