How do I convert Gigabytes to Megabytes?

Multiply gigabytes by 1000. For example, 1 GB = 1000 MB and 64 GB = 64,000 MB.

How many MB are in one GB?

Using decimal (SI) units, there are 1000 MB in one GB. Using binary units, 1 GiB = 1024 MiB — this tool uses the decimal 1000 convention.

Should I use 1000 or 1024?

It depends on context. Storage marketing and most file managers use decimal (1 GB = 1000 MB). Some operating systems report binary (1 GiB = 1024 MiB). This converter uses 1000.

How do I convert MB back to GB?

Divide megabytes by 1000. For example, 2500 MB ÷ 1000 = 2.5 GB. Type into the MB field and the tool converts instantly.

How many MB is a 256 GB drive?

256 GB equals 256,000 MB at the decimal 1000 factor.

What's the difference between GB and GiB?

GB is decimal (10^9 bytes); GiB is binary (2^30 = 1,073,741,824 bytes). A 1 GiB file is about 1.074 GB. This tool works in decimal GB/MB.

Is my data uploaded anywhere?

No — every conversion runs locally in your browser and nothing is sent to any server.

Gigabytes to Megabytes Converter

This free converter changes gigabytes (GB) into megabytes (MB) and back again, updating live as you type. It’s useful for sizing files, storage drives, downloads, and data caps in consistent units.

How it works

Using decimal (SI) digital units — the convention storage vendors and most file managers use — one gigabyte equals one thousand megabytes. The converter applies that single factor:

MB = GB × 1000 (and GB = MB ÷ 1000)

Type in the GB field to multiply, or the MB field to divide. Note the binary alternative: 1 gibibyte (GiB) = 1024 mebibytes (MiB). This tool uses the decimal 1000 convention, not 1024.

Example

You have a 64 GB memory card and want the figure in megabytes:

64 × 1000 = 64,000 MB

So a 64 GB card is sixty-four thousand megabytes in decimal units.

Gigabytes (GB)	Megabytes (MB)
1 GB	1000 MB
100 GB	100000 MB
500 GB	500000 MB
1000 GB	1000000 MB

All calculations run entirely in your browser — no data is sent to any server.