Download / Upload Time Calculator
Estimate how long it takes to transfer a file of a given size over a connection of a given speed, accounting for real-world overhead.
Runs locally in your browser
Accounts for protocol overhead and congestion.
Mbps means megabits per second; MB/s means megabytes per second. 1 MB/s = 8 Mbps.
Assuming 90% effective throughput. Real transfers vary with disk speed, latency, and network contention.
What is the Download / Upload Time Calculator?
This tool estimates transfer time from a file size and a connection speed, and shows the effect of protocol and real-world overhead.
How to use it
- 1Enter the file size and unit.
- 2Enter the connection speed and unit (note bits vs bytes).
- 3Optionally set an efficiency factor.
- 4Read the estimated transfer time.
How it works
Time = file size in bits / (speed in bits × efficiency). The tool handles the bit/byte conversion (1 byte = 8 bits) that trips up most manual estimates.
Limitations & notes
- Real throughput rarely equals the advertised link rate; 70–90% efficiency is typical.
- Latency, congestion and disk speed can dominate for small files.
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