Uses decimal units: 1 GB = 1,000 MB. That matches drive labels and most provider plans.
Data & storage
File Size Converter
Convert KB, MB, GB and TB using decimal units.
How does a file size converter work?
Enter a value and a unit and the converter shows the equivalent in KB, MB, GB and TB at the same time. It uses decimal (SI) units, where each step is a factor of 1,000 – the convention used on drive labels, mobile plans and most internet providers.
Reference table
- 1 KB = 1,000 bytes
- 1 MB = 1,000 KB
- 1 GB = 1,000 MB
- 1 TB = 1,000 GB
Why sizes can look different
Some operating systems display sizes in binary units (1 GiB = 1,024 MiB) but label them GB, which is why a “1 TB” drive appears as about 931 GB. That is a difference in units, not missing storage. For binary-style units try the Data Storage Converter.
FAQ
Frequently asked questions about the File Size Converter
How many MB are in 1 GB?
In decimal units, 1 GB is 1,000 MB.
Why does my 1 TB drive show less space?
Drive makers use decimal units, while some operating systems report binary units, so the same drive appears smaller.
Is a KB the same as a Kb?
No. KB is kilobytes and Kb is kilobits. A byte is 8 bits.
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Use this toolResults are estimates for planning. Last reviewed 20 September 2026.