How do you convert gigabits to megabits?

To convert gigabits (Gb) to megabits (Mb), multiply the data size in gigabits by 1,000 (megabits = gigabits × 1,000).

What is 5 gigabits in megabits?

5 gigabits (5 Gb) is equal to 5,000 megabits (5,000 Mb).

Which is larger, 1 gigabit (Gb) or 1 megabit (Mb)?

One gigabit (Gb) is larger than one megabit (Mb). Specifically, 1 Gb contains 1,000 Mb, whereas 1 Mb is 0.001 Gb.

How do I convert back from megabits (Mb) to gigabits (Gb)?

To reverse the calculation from Mb to Gb, multiply your megabit value by the inverse factor 0.001 (or divide by 1,000). 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).

Gigabits to Megabits Converter

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

Megabits to Gigabits (Mb → Gb)

Convert Gigabits to Megabits

Enter a value in gigabits (Gb) to convert to megabits (Mb).

Value (Gb)

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5,000megabits

5 Gb = 5,000 Mb

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Suggested Conversions

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

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Gigabit to Megabit Conversion Table

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

Gigabits (Gb)	Megabits (Mb)
1 Gb	1,000 Mb
2 Gb	2,000 Mb
2.5 Gb	2,500 Mb
5 Gb	5,000 Mb
10 Gb	10,000 Mb
15 Gb	15,000 Mb
20 Gb	20,000 Mb
25 Gb	25,000 Mb
30 Gb	30,000 Mb
50 Gb	50,000 Mb

How to Convert Gigabits to Megabits

To convert gigabits to megabits, multiply the data size by the following conversion ratio: 1,000 megabits/gigabit.

Since one gigabit is equal to 1,000 megabits, you can use this simple formula to convert:

megabits = gigabits × 1,000

The data size in megabits is equal to the data size in gigabits multiplied by 1,000.

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

megabits = (5 Gb × 1,000) = 5,000 Mb

How Many Megabits Are in a Gigabit?

There are 1,000 megabits in a gigabit, which is why we use this value in the formula above.

1 Gb = 1,000 Mb|1 Mb = 0.001 Gb

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

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

What Is a Gigabit?

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

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

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

In practice, gigabits (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 gigabits 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 gigabits (Gb) and megabits (Mb), keep full floating-point precision (1 Gb = 1,000 Mb; 1 Mb = 0.001 Gb) during intermediate calculations and round only the final megabit figure to match your instrument tolerance.

More Gigabit & Megabit Conversions

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

Convert from Gigabits

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Frequently Asked Questions

There are 1,000 megabits (Mb) in 1 gigabit (Gb). Conversely, 1 megabit (Mb) is equal to 0.001 gigabits (Gb).

Digital Storage Converter

Quick Info

Direct Factor: 1 gigabit (Gb) equals 1,000 megabits (Mb).
Inverse Factor: 1 megabit (Mb) equals 0.001 gigabits (Gb).
Formula: megabits = gigabits × 1,000.
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

Gigabit (Gb)

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

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 — Gigabits (Gb) to Megabits (Mb)
NIST / IEC Standard
[2]
BIPM (SI Decimal Prefixes (k, M, G, T, P))·Unit Specifications: Gigabit (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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