Gigabytes to Megabytes Converter
Type a number to convert gigabytes to megabytes. The result updates as you type, and you can swap the units to convert back.
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The formula
megabytes = gigabytes x 1,000
How to convert gigabytes to megabytes
To convert gigabytes to megabytes, multiply by 1,000. One gigabyte equals 1,000 megabytes, and one megabyte equals 0.001 gigabytes.
A worked example
5 gigabytes is 5,000 megabytes.
Quick conversion table
| Gigabytes | Megabytes |
|---|---|
| 0.5 GB | 500 MB |
| 1 GB | 1,000 MB |
| 2 GB | 2,000 MB |
| 4 GB | 4,000 MB |
| 5 GB | 5,000 MB |
| 8 GB | 8,000 MB |
| 10 GB | 10,000 MB |
| 16 GB | 16,000 MB |
| 32 GB | 32,000 MB |
| 64 GB | 64,000 MB |
| 128 GB | 128,000 MB |
| 256 GB | 256,000 MB |
| 500 GB | 500,000 MB |
| 1,000 GB | 1,000,000 MB |
And the other way: megabytes to gigabytes
| Megabytes | Gigabytes |
|---|---|
| 1 MB | 0.001 GB |
| 2 MB | 0.002 GB |
| 5 MB | 0.005 GB |
| 10 MB | 0.01 GB |
| 20 MB | 0.02 GB |
| 25 MB | 0.025 GB |
| 50 MB | 0.05 GB |
| 100 MB | 0.1 GB |
When you will need it
File sizes, mobile data plans and storage devices mix the two. Pay attention to decimal versus binary units.
Storage makers use 1 GB = 1,000 MB. Operating systems sometimes use 1,024, which is why a drive seems to hold less than advertised.
Decimal or binary?
In decimal units, 1 GB is 1,000 MB, which is what drive makers and mobile networks use. In binary units, 1 GiB is 1,024 MiB, and some operating systems still label these as GB. The difference is about 7 percent at the gigabyte level, which is why a "500 GB" drive can show as about 465 GB on a computer.
Gigabytes to Megabytes Converter: frequently asked questions
How many megabytes are in one gigabyte?
One gigabyte is 1,000 megabytes.
How many gigabytes are in one megabyte?
One megabyte is 0.001 gigabytes.
Is this gigabytes to megabytes conversion exact?
The factor is exact where the units are defined that way, and we show the result rounded for readability.
How exact is the conversion?
It uses the internationally agreed definitions, and rounds only the number you see.
Is what I enter in this converter saved or sent anywhere?
No. The calculation runs in your browser, so what you enter is not sent to our servers. We only count, anonymously, whether a tool ran successfully.
Is this converter free to use?
Yes. It is free, needs no sign-up and has no usage limit.
Last reviewed: October 3, 2026