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GB to MB Converter

Convert gigabytes (GB) to megabytes (MB) as you type — 1 GB = 1,000 MB. Switch units, change the precision or copy the result.

How to use this tool

Steps for using the Unit Converter.

  1. Enter a value in From — gigabytes are already selected.
  2. The result in megabytes appears instantly. Change either unit to convert to anything else in data storage.
  3. Use the swap button for the reverse conversion, and set the decimal places you need.
  4. Turn on Show formula to see the calculation, then copy or share the result.

Example

1 GB to MB

Gigabyte
1 GB
Megabyte
MB = 1 × 1000 = 1,000 MB

Common use cases

  • Storage and file sizes.
  • Explaining drive capacities shown by Windows.
  • Memory limits and quotas in cloud and container configs.

GB to MB conversion table

gigabytes to megabytes
Gigabyte (GB)Megabyte (MB)
1 GB1,000 MB
2 GB2,000 MB
4 GB4,000 MB
8 GB8,000 MB
16 GB16,000 MB
32 GB32,000 MB
64 GB64,000 MB
gigabytes to megabytes (continued)
Gigabyte (GB)Megabyte (MB)
128 GB128,000 MB
256 GB256,000 MB
500 GB500,000 MB
512 GB512,000 MB
1,000 GB1,000,000 MB
1,024 GB1,024,000 MB

Values rounded to 6 decimal places.

Related conversions

The units

Gigabyte (GB)
10⁹ bytes. Part of the SI system.
Megabyte (MB)
1,000,000 bytes. Part of the SI system.

How to convert gigabytes to megabytes

Decimal units, as used by storage makers and mobile data plans: 1 GB = 1,000 MB. Operating systems that count in binary show GiB/MiB instead.

To convert gigabytes to megabytes, use MB = GB × 1000. One gigabyte equals 1,000 megabytes, and one megabyte equals 0.001 gigabytes.

Gigabyte (GB): 10⁹ bytes. Megabyte (MB): 1,000,000 bytes.

For the opposite direction, use the MB to GB converter. All digital information units are on the data storage converter.

Limitations

  • Results are rounded to the decimal places you choose; the calculation itself keeps full precision.

Frequently asked questions

How many megabytes are in a gigabyte?

1 GB = 1,000 MB. Multiply gigabytes by 1000 (or use MB = GB × 1000).

How do I convert gigabytes to megabytes?

Use MB = GB × 1000. For example, 1 GB = 1,000 MB and 2 GB = 2,000 MB.

Is 1 GB 1,000 MB or 1,024 MB?

In SI units 1 GB = 1,000 MB. 1,024 is the binary relationship: 1 GiB = 1,024 MiB. Both are offered here, kept separate.

Why does my 1 TB drive show 931 GB?

The drive has 10¹² bytes; Windows divides by 1024³ and labels the result “GB”, giving 931 (really GiB).