Direct answer
How Many MB in a GB? Binary 1024 vs SI 1000
Koverts’ data converter uses binary: 1 GB = 1024 MB. Drive marketing often uses SI: 1 GB = 1000 MB — with MiB caveats.
Question
How many megabytes are in a gigabyte?
On Koverts’ converter, 1 gigabyte (GB) equals 1024 megabytes (MB). Drive marketing often uses 1000 MB (SI).
1 GB (binary / Koverts)
1024 MB
1 GB (SI marketing)
1000 MB
1 GiB
1024 MiB
Explanation
Binary (IEC-style) file sizes use powers of 1024: 1 GB = 1024 MB = 1,073,741,824 bytes.
Hard-drive marketing often uses SI decimal: 1 GB = 1000 MB = 1,000,000,000 bytes.
That gap is why a “500 GB” drive can show less free space in an OS that reports gibibytes.
Important caveat
Confirm whether a tool means decimal GB/MB or binary GiB/MiB before comparing capacities.