Download Time CalculatorEstimate how long a download or upload takes from the file size and connection speed (Mbps, Gbps or MB/s), with an allowance for protocol overhead.
File Size Converter
Why does a “500 GB” drive show 465 GB? Because manufacturers use decimal units and many operating systems show binary units. This converter shows both side by side so you can compare like with like.
…or choose a file to measure
Runs entirely in your browser. Your input and files are not uploaded to any server.
How to use
- Enter a size and choose its unit, or choose a file to read its exact size.
- Read the size in every decimal and binary unit.
- Copy the value you need.
Examples
Hard drive
500 GB = 465.66 GiB.
Email limit
25 MB = 23.84 MiB.
Privacy
Your files and text stay in your browser while you use this tool, and ads or anonymous visit statistics do not receive them. Only your favorites and recent tools are saved on your device. Privacy policy
Want proof? Check it with your browser’s Network tab: How to check that a tool does not upload your files
Frequently asked questions
What is the difference between MB and MiB?
A megabyte (MB) is 1,000,000 bytes. A mebibyte (MiB) is 1,048,576 bytes (1024 × 1024). Windows labels MiB as “MB”, which causes the confusion.
Is my file uploaded?
No. Only its size is read by the browser; the content is not opened.
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