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GB to MB Converter

Convert gigabytes (GB) to megabytes (MB), with gibibytes (GiB) to mebibytes (MiB) and other storage units shown alongside.

What this tool does

Convert gigabytes (GB) to megabytes (MB), with gibibytes (GiB) to mebibytes (MiB) and other storage units shown alongside. Type an amount in gigabytes, choose the units, and the tool converts it to megabytes. It offers 7 data storage units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Gigabyte, Megabyte, Kilobyte, Byte, Gibibyte, Mebibyte, Kibibyte. Starts as Gigabyte.
  • To: Choose one of the same 7 units as "From". Starts as Megabyte.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from gigabytes to megabytes:

  • 1 GB = 1,000 MB
  • 5 GB = 5,000 MB
  • 10 GB = 10,000 MB
  • 50 GB = 50,000 MB
  • 100 GB = 100,000 MB

Multiply the number of gigabytes by 1,000 to get megabytes. Both units are exact definitions, so 1,000 is the exact factor: 1 GB = 1,000 MB.

Sources: Gigabyte: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes). Megabyte: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes).

Limitations

  • GB here is the decimal gigabyte (1000 megabytes). Pick gibibyte if your source uses 1024.
  • Converts the size of data only.

FAQs

Q: How many MB are in a GB?
A: 1 gigabyte = 1000 megabytes in the decimal (SI) system, which is the count drive makers use for advertised capacity.
Q: How many MiB are in a GiB?
A: 1 gibibyte = 1024 mebibytes. This is the binary count that many operating systems use when they label sizes MB and GB.
Q: How do I convert MB back to GB?
A: Choose megabyte as the From unit and gigabyte as the To unit.

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