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GB to MB Converter (GB to MB)

GB to MB Converter

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Convert gigabytes (GB) to megabytes (MB) for file sizes, storage capacity, uploads, and data limits. Use Decimal SI for standard GB and MB, or switch to Binary IEC for the corresponding GiB and MiB units.

GB and MB versus GiB and MiB

Decimal SI defines 1 GB = 1,000 MB. Binary IEC defines 1 GiB = 1,024 MiB. They are different unit pairs: 1 GB is 1,000,000,000 bytes, while 1 GiB is 1,073,741,824 bytes.

The calculator starts in Decimal SI mode. In Binary IEC mode, it changes the unit labels to MiB and GiB as well as using the base-1,024 calculation.

GB to MB formulas

Decimal: MB = GB × 1,000.
Binary: MiB = GiB × 1,024.

For example, 5 GB × 1,000 = 5,000 MB, while 5 GiB × 1,024 = 5,120 MiB.

Common GB to MB examples

Input value Decimal GB to MB Binary GiB to MiB
1 1 GB = 1,000 MB 1 GiB = 1,024 MiB
2 2 GB = 2,000 MB 2 GiB = 2,048 MiB
5 5 GB = 5,000 MB 5 GiB = 5,120 MiB
10 10 GB = 10,000 MB 10 GiB = 10,240 MiB
25 25 GB = 25,000 MB 25 GiB = 25,600 MiB
100 100 GB = 100,000 MB 100 GiB = 102,400 MiB

How to use the calculator

  1. Enter the number of gigabytes or gibibytes.
  2. Choose Decimal SI for GB/MB or Binary IEC for GiB/MiB.
  3. Confirm that the From and To labels match the unit you mean.
  4. Read the converted value and its displayed result unit.

Frequently asked questions

How many MB are in 1 GB?

There are 1,000 MB in 1 GB under the SI decimal definition. In the binary system, 1 GiB equals 1,024 MiB.

What is 10 GiB in MiB?

10 GiB × 1,024 = 10,240 MiB. Choose Binary IEC mode to see this result with the correct labels.

Why does my computer show another number?

Storage devices commonly advertise decimal GB, while some operating systems display a binary-size value but label it GB. The underlying byte count may be the same even though the displayed unit convention differs.

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