Download Time Calculator
Estimate transfer time for games, videos, backups and other files. Compare advertised connection speeds with a realistic throughput assumption.
iTechVora Tools
Download Time Calculator
Turn a file size and connection speed into a practical time estimate.
Free · No signup · Calculations run in your browser
Ready to calculate
How to use
Enter the file size, its unit, and your connection speed. Choose the usable percentage of that speed. If you already know the measured download rate, use 100% to avoid applying the same slowdown twice.
Methodology
Time in seconds = file size in bytes × 8 / (connection speed in bits per second × efficiency). Decimal KB, MB, GB and TB use powers of 1,000. Binary KiB, MiB, GiB and TiB use powers of 1,024. A byte contains eight bits. Mbps and MB/s are different units.
Worked example
120 GB at 200 Mbps takes 4,800 seconds, or 1 hour 20 minutes, at full speed. At 85% usable speed it takes approximately 1 hour 34 minutes 8 seconds. This arithmetic is precise; the real network estimate is not.
Limitations
The calculation assumes a constant transfer rate. Server throttling, Wi-Fi interference, protocol overhead, competing downloads, pauses and storage speed can affect the result. Game installation, decompression and patch processing are excluded. Displayed times round upward to whole seconds.
FAQ
Why is 200 Mbps not 200 MB/s?
Divide bits per second by eight: 200 Mbps equals 25 MB/s before losses.
Why does GiB take longer than GB?
One GiB contains 1,073,741,824 bytes; one GB contains 1,000,000,000 bytes.
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Methodology version 1 · Updated September 28, 2026.