Download Time Calculator
Estimate file download time from file size and connection speed, with explicit decimal and binary size units.
Your result
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Choose Calculate to see your result.
How to use this calculator
- Enter your values in the labeled fields, keeping the displayed units.
- Choose Calculate or press Enter in a single-line field.
- Review the result and the assumptions below before using it.
Formula and method
Seconds = file bytes × 8 / (Mbps × 1,000,000 × throughput / 100).
Worked example
A 1 GB file over a 100 Mbps connection takes 80 seconds at 100% effective throughput.
What the result assumes
This is an estimate. Server limits, Wi-Fi conditions, competing traffic, and protocol overhead can reduce effective throughput.
Common question
Why are MB and Mbps different?
MB measures megabytes of data; Mbps measures megabits per second. One byte contains eight bits.