This converter uses binary units, where 1 GB = 1024 MB, which is how Windows reports file and disk sizes. Storage manufacturers often use decimal units, where 1 GB = 1000 MB, which is why a "1 TB" drive shows as about 931 GB in your operating system.
Calculator
Formula used
GB = MB ÷ 1024 (binary) · GB = MB ÷ 1000 (decimal, used by drive makers)
How to use the Mb to Gb Converter
- Enter a size in megabytes.
- Read the equivalent in gigabytes.
- Or enter gigabytes to convert back to megabytes.
- Use the table for common sizes such as 512 MB or 4 GB.
About this tool
The Mb to Gb Converter is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Checking whether a file fits a storage limit.
- Comparing mobile data plans.
- Understanding why a drive shows less space than advertised.
- Planning upload sizes for video or backups.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Is 1 GB 1000 or 1024 MB?
Both are used. Operating systems use 1024 (binary), hard-drive marketing uses 1000 (decimal). This tool uses 1024.
Why does my 1 TB drive show 931 GB?
The manufacturer counts 1 TB as a trillion bytes, while the OS divides by 1024 at each step, so the reported capacity is smaller.
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