GB to MB
Convert gigabytes to megabytes (or megabytes to gigabytes) instantly. Type a value in either field and the other updates live; use the swap button to flip the direction.
How It Works
One gigabyte is 1024 megabytes, so to convert gigabytes to megabytes you multiply the number of gigabytes by 1024. To go the other way, divide megabytes by 1024.
Frequently Asked Questions
How many megabytes are in one gigabyte?
One gigabyte is 1024 megabytes in the binary (base-2) system used for computer memory and file sizes. This converter uses the 1024 ratio.
Why do hard drives show fewer gigabytes than advertised?
Drive manufacturers often use decimal units (1 GB = 1000 MB), while computers report in binary units (1 GB = 1024 MB). A 500 GB drive advertised in decimal shows about 465 GB in your operating system.
Is 1 GB the same as 1 GiB?
Strictly, 1 GB is 1000 MB in the SI standard and 1 GiB is 1024 MiB. In everyday computing, however, GB almost always means the 1024-based value, which is what this converter uses.