What is the GB to MB Converter?
This tool converts a quantity of gigabytes (GB) into megabytes (MB). It supports both common standards: the decimal (SI) base, where 1 GB = 1000 MB, used by storage manufacturers and most marketing; and the binary base, where 1 GB = 1024 MB, often reported by operating systems and memory tools.
How to use it
Enter the number of gigabytes you want to convert, then pick the conversion base. Decimal (1000) is the default and matches the capacity printed on hard drives, SSDs, and cloud storage plans. Choose binary (1024) if you need the value the way Windows or some software reports it. The result updates to show the equivalent number of megabytes.
The formula explained
The conversion is a simple multiplication. In the decimal system, $$\text{MB} = \text{GB} \times 1000$$ In the binary system, $$\text{MB} = \text{GB} \times 1024$$ Because storage units scale by these fixed factors, no rounding is needed beyond display.
Worked example
Suppose you have a 2 GB file and want its size in megabytes. Using the decimal base: $$2 \times 1000 = \textbf{2000 MB}$$ Using the binary base: $$2 \times 1024 = \textbf{2048 MB}$$ The small difference (48 MB here) is why a "2 GB" drive can look slightly smaller in your operating system.
FAQ
Why are there two answers? Storage makers use base-1000 (decimal), while many operating systems use base-1024 (binary). Both are valid; they just use different conventions.
Which one should I use? Use decimal (1000) for drive capacities and download sizes quoted by vendors. Use binary (1024) to match what your computer's file properties display.
Is GB bigger than MB? Yes. A gigabyte is 1000 (or 1024) times larger than a megabyte, so converting GB to MB always produces a larger number.
