How do you convert megabits to gigabytes?

To convert megabits (Mb) to gigabytes (GB), multiply the data size in megabits by 0.000125 (gigabytes = megabits × 0.000125).

What is 5 megabits in gigabytes?

5 megabits (5 Mb) is equal to 0.000625 gigabytes (0.000625 GB).

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

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

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

To reverse the calculation from GB to Mb, multiply your gigabyte (decimal) value by the inverse factor 8,000 (or divide by 0.000125). 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 Mb and GB?

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).

Megabits to Gigabytes Converter

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

Gigabytes to Megabits (GB → Mb)

Convert Megabits to Gigabytes

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

Value (Mb)

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0.000625gigabytes

5 Mb = 0.000625 GB

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Suggested Conversions

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

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Megabit to Gigabyte Conversion Table

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

Megabits (Mb)	Gigabytes (GB)
1 Mb	0.000125 GB
2 Mb	0.00025 GB
2.5 Mb	0.0003125 GB
5 Mb	0.000625 GB
10 Mb	0.00125 GB
15 Mb	0.001875 GB
20 Mb	0.0025 GB
25 Mb	0.003125 GB
30 Mb	0.00375 GB
50 Mb	0.00625 GB

How to Convert Megabits to Gigabytes

To convert megabits to gigabytes, multiply the data size by the following conversion ratio: 0.000125 gigabytes/megabit.

Since one megabit is equal to 0.000125 gigabytes, you can use this simple formula to convert:

gigabytes = megabits × 0.000125

The data size in gigabytes is equal to the data size in megabits multiplied by 0.000125.

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

gigabytes = (5 Mb × 0.000125) = 0.000625 GB

How Many Gigabytes Are in a Megabit?

There are 0.000125 gigabytes in a megabit, which is why we use this value in the formula above.

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

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

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

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). [1]

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.

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. [2]

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.

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

More Megabit & Gigabyte Conversions

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

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Frequently Asked Questions

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

Digital Storage Converter

Quick Info

Direct Factor: 1 megabit (Mb) equals 0.000125 gigabytes (GB).
Inverse Factor: 1 gigabyte (decimal) (GB) equals 8,000 megabits (Mb).
Formula: gigabytes = megabits ÷ 8000.
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

Megabit (Mb)

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

Gigabyte (Decimal) (GB)

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

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

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