gigabytes to megabytes Converter
Type a value in gigabytes and get the answer in megabytes instantly — or convert the other way. The conversion uses the exact relationship 1 gigabytes = 1000 megabytes, the same formula used in textbooks and engineering references.
Storage makers use decimal gigabytes: 1 GB = 1,000 MB. Your operating system may display binary gibibytes (1 GiB = 1,024 MiB), which is why a '256 GB' drive shows as about 238 GiB in Windows — the drive is not lying, the units are different.
How to use
- Type your value into the gigabytes box — the megabytes result updates as you type.
- To go the other direction, type into the megabytes box instead and read the gigabytes result.
- Copy the result with one tap, or scan the reference table below for common values.
Frequently asked questions
How do you convert gigabytes to megabytes?
Multiply the number of gigabytes by 1000. For example, 10 gigabytes = 10000 megabytes. The converter above does this for you and shows more decimal places than you will ever need.
How many megabytes are in one gigabytes?
Exactly 1000 megabytes. This is a fixed definition, not an approximation, so the conversion is exact at any scale.
Is this converter accurate for professional use?
Yes — it uses full double-precision arithmetic and the official gigabytes-to-megabytes factor, so results are reliable for schoolwork, cooking, fitness, travel and technical work.
Can I convert megabytes back to gigabytes?
Yes. The converter is two-way: just type in the second box and the first box updates instantly with the reverse conversion.