GB ↔ MB converter
Storage vendors use decimal units (1 GB = 1000 MB); operating systems often report binary units (1 GiB = 1024 MiB). Pick the base that matches what you're comparing.
KB
1,000,000
TB
0.001
Bytes
1,000,000,000
What is GB ↔ MB converter?
Gigabytes and megabytes can be counted two different ways: decimal (1 GB = 1000 MB), the convention drive manufacturers and ISPs use, or binary (1 GB = 1024 MB), the convention most operating systems use when reporting file and disk sizes.
How to use it
Pick decimal or binary from the dropdown, then type into either field. Mixing up the two bases is the classic reason a "500 GB" drive shows up as roughly 465 GB in Windows.
Example
Decimal: 1 GB = 1000 MB = 1,000,000 KB
Binary: 1 GB = 1024 MB = 1,048,576 KB