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Data transfer time calculator
Estimate transfer duration from file size, link speed and optional overhead.
Text and numbers
Text
Browser only
Your input and output are processed in this browser. They are not uploaded for processing. No account is required.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the requested values: File size; File-size unit; Transfer speed; Speed unit; Estimated overhead (%).
- Choose Calculate and review the result.
- Download the text result if useful. Reset restores the initial inputs and clears the result.
Examples
100 MB at 100 Mbit/s with no overhead takes 8 seconds.
Limitations
Runs entirely in your browser. Numeric calculations use IEEE-754 floating-point arithmetic; displayed values are rounded to 15 significant digits unless stated otherwise.
Estimate assumes constant usable speed. Real networks, protocols and storage can be slower.
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