GB to MB Converter
Free GB to MB converter — turn gigabytes into megabytes using the binary standard (1 GB = 1024 MB). Instant and two-way, no signup.
About the GB to MB Converter
Convert gigabytes to megabytes instantly. This tool uses the binary standard — 1 GB = 1024 MB — which is how Windows and most operating systems report file and drive sizes. Type a GB value and get megabytes at once; type MB to convert back.
The conversion matters when juggling storage in mixed units: checking whether a 700 MB video fits in the 2 GB left on a phone (2 GB = 2,048 MB, so yes, twice over), splitting files for a 4 GB FAT32 limit, or comparing a mobile data plan quoted in GB against per-app usage shown in MB.
Be aware there are two standards: drive manufacturers advertise decimal gigabytes (1 GB = 1000 MB), which is why a '500 GB' disk shows as roughly 465 GB in Windows. This converter follows the binary convention; multiply by 1000 instead if you need the decimal figure.
How to Use the GB to MB Converter
- 1Enter a size in gigabytes — for example 1.5.
- 2Read the megabyte result instantly (1.5 GB = 1,536 MB).
- 3Type a value in MB instead to convert megabytes to gigabytes.
- 4Use the table for common sizes from 0.5 to 512 GB.
Frequently Asked Questions
How many MB are in 1 GB?
In the binary standard used by operating systems, 1 GB = 1,024 MB. In the decimal standard used by drive manufacturers and mobile carriers, 1 GB = 1,000 MB. This tool uses 1,024.
How many MB is 2 GB?
2 GB is 2,048 MB (binary). Common sizes: 4 GB = 4,096 MB, 8 GB = 8,192 MB, 16 GB = 16,384 MB and 32 GB = 32,768 MB.
Why does my 1 TB drive show less than 1000 GB?
Manufacturers count 1 TB as 1,000,000,000,000 bytes (decimal), but Windows divides by 1024 three times, reporting about 931 GB. Nothing is missing — the two standards just count differently.
Is 500 MB half a gigabyte?
Almost. In binary terms, half a GB is 512 MB, so 500 MB is about 0.488 GB. In decimal terms 500 MB is exactly half of a 1,000 MB gigabyte.
What are GiB and MiB?
GiB (gibibyte) and MiB (mebibyte) are the unambiguous names for the binary units: 1 GiB = 1,024 MiB exactly. When Windows says 'GB' it is technically showing GiB — the same 1024-based math this converter performs.