How do you convert megabits to gigabits?

To convert megabits (Mb) to gigabits (Gb), multiply the data size in megabits by 0.001 (gigabits = megabits × 0.001).

What is 5 megabits in gigabits?

5 megabits (5 Mb) is equal to 0.005 gigabits (0.005 Gb).

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

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

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

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

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

Gigabits to Megabits (Gb → Mb)

Convert Megabits to Gigabits

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

Value (Mb)

From

Result

•

0.005gigabits

5 Mb = 0.005 Gb

Result updates automatically

Get Widget

Suggested Conversions

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

[1–3] ↓

Megabit to Gigabit Conversion Table

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

Megabits (Mb)	Gigabits (Gb)
1 Mb	0.001 Gb
2 Mb	0.002 Gb
2.5 Mb	0.0025 Gb
5 Mb	0.005 Gb
10 Mb	0.01 Gb
15 Mb	0.015 Gb
20 Mb	0.02 Gb
25 Mb	0.025 Gb
30 Mb	0.03 Gb
50 Mb	0.05 Gb

How to Convert Megabits to Gigabits

To convert megabits to gigabits, multiply the data size by the following conversion ratio: 0.001 gigabits/megabit.

Since one megabit is equal to 0.001 gigabits, you can use this simple formula to convert:

gigabits = megabits × 0.001

The data size in gigabits is equal to the data size in megabits multiplied by 0.001.

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

gigabits = (5 Mb × 0.001) = 0.005 Gb

How Many Gigabits Are in a Megabit?

There are 0.001 gigabits in a megabit, which is why we use this value in the formula above.

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

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

Megabits and gigabits 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 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). [2]

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.

When converting data size between megabits (Mb) and gigabits (Gb), keep full floating-point precision (1 Mb = 0.001 Gb; 1 Gb = 1,000 Mb) during intermediate calculations and round only the final gigabit figure to match your instrument tolerance.

More Megabit & Gigabit Conversions

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

Convert from Megabits

Convert to Gigabits

Frequently Asked Questions

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

Digital Storage Converter

Quick Info

Direct Factor: 1 megabit (Mb) equals 0.001 gigabits (Gb).
Inverse Factor: 1 gigabit (Gb) equals 1,000 megabits (Mb).
Formula: gigabits = megabits ÷ 1000.
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).

Gigabit (Gb)

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

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

Related Categories

Add This Calculator to Your Site

Free HTML widget · 4 embed formats

Embed the interactive Megabits to Gigabits converter on your blog, classroom, or documentation page.

Customize & Get Embed Code

References

NIST · BIPM · ISO

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

Measurement Navigator78 Categories9 Scientific Domains

Browse All 78 Measurement Categories

A–Z Directory →Sitemap

Common ConvertersEveryday metric, imperial, and US customary converters for length, weight, volume, temperature, area, pressure, energy, speed, time, and data.