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Gigabyte to Megabyte Converter

1 gigabyte is exactly 1000 megabytes. Convert gigabytes (GB) to megabytes (MB) below: type a value and the result updates as you type.

GB to MB calculator

Dot or comma decimals and scientific notation (1e-3) work.

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Gigabyte to Megabyte conversion

1 GB = 1000 MBone gigabyte in megabytes

1 MB = 0.001 GBone megabyte in gigabytes

Gigabyte (GB): One billion bytes (decimal). Storage makers use GB; many operating systems show GiB but label it GB.

Megabyte (MB): One million bytes (decimal). The binary counterpart, 1,048,576 bytes, is the mebibyte (MiB).

Source:IEC 80000-13:2008, Quantities and units: Information science and technology

How to convert gigabytes to megabytes

To convert gigabytes to megabytes, multiply the number of gigabytes by 1000.

Formula

MB = GB × 1000

Examples

  • 5 GB = 5 × 1000 = 5000 MB
  • 25 GB = 25 × 1000 = 25000 MB
  • 100 GB = 100 × 1000 = 100000 MB

Gigabyte to Megabyte conversion table

Gigabyte to Megabyte
Gigabyte (GB)Megabyte (MB)
0.1 GB100 MB
0.5 GB500 MB
1 GB1000 MB
2 GB2000 MB
3 GB3000 MB
5 GB5000 MB
10 GB10000 MB
20 GB20000 MB
25 GB25000 MB
50 GB50000 MB
100 GB100000 MB
250 GB250000 MB
500 GB500000 MB
1000 GB1000000 MB

Values rounded to 10 significant digits where needed.

Frequently asked questions

How many megabytes are in one gigabyte?
One gigabyte is exactly 1000 megabytes.
How do I convert megabytes to gigabytes?
To convert megabytes to gigabytes, multiply the number of megabytes by 0.001. The formula is GB = MB × 0.001.
Is this conversion exact?
Yes. Both units have exact definitions and the factor 1000 is exact. Displayed results are only rounded when they have many decimal places.
Which is larger, a gigabyte or a megabyte?
A gigabyte is 1000 times larger than a megabyte. In other words, a megabyte is exactly 1/1000 of a gigabyte.