Convert gigabytes to megabytes

Enter a value in gigabytes to convert it to megabytes.

=megabytes

gigabytes to megabytes reference

gigabytesmegabytes
1 GB1000 MB
2 GB2000 MB
5 GB5000 MB
10 GB10000 MB
25 GB25000 MB
50 GB50000 MB
100 GB100000 MB

The conversion factor

One gigabyte is 1000 megabytes. So to convert, multiply your figure in gigabytes by 1000. To go the other way, multiply megabytes by 0.001, or use the megabytes to gigabytes converter.

Doing it in your head

For a quick estimate, round the factor: roughly "times 1000". Use the exact converter above when the number matters.

Where this conversion comes up

Storage and download sizes, data caps, and the decimal-vs-binary gap that makes a “1 TB” drive show as about 931 GiB.

See the common unit conversions cheat sheet for the factors worth memorising.

Related tools

megabytes to gigabytesgigabytes to terabytesterabytes to gigabyteskilobytes to megabytesmegabytes to kilobytesbytes to kilobytes

Frequently asked questions

How many megabytes are in a gigabyte?
1 gigabyte = 1000 megabytes.
What is the formula to convert gigabytes to megabytes?
Multiply the number of gigabytes by 1000. To go back the other way, multiply megabytes by 0.001.
What is 10 gigabytes in megabytes?
10 gigabytes = 10000 megabytes. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.

Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.