ClarityHow to use this converter
- Enter file size, file-size unit, connection speed (mbps), usable throughput (%).
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Seconds = file bytes × 8 ÷ (megabits per second × 1,000,000 × usable-throughput fraction). One GB is 1,000,000,000 bytes; one GiB is 1,073,741,824 bytes.
A WORKED EXAMPLE
A 1 GB file over a 100 Mbps connection takes 80 seconds at 100% usable throughput, or 100 seconds at 80%.
What to keep in mind
An estimate for a steady data rate. It excludes startup delays, server limits, compression, changing Wi-Fi quality and pauses. Usable throughput is your assumption, not a measured network speed.
Common questions
Why multiply file size by eight?
Files are measured in bytes while connection speeds usually use bits; one byte contains eight bits.
Does this run a speed test?
No. It sends no test downloads; enter a measured or advertised connection speed yourself.
Methodology maintained by ClarityKit. How these tools are built and checked.