How this calculator works
Efficiency is the share of the advertised connection rate available for this transfer. This is a steady-throughput estimate; server limits, congestion, latency and competing traffic can still delay completion. Decimal and binary file sizes remain distinct.
The formula
Required bits/s = file bytes × 8 / seconds / (efficiency/100). Mbps = bits/s / 1,000,000.A quick example
Transferring a decimal 1 GB file in 80 seconds at 100% efficiency requires 100 Mbps, equivalent to 12.5 MB/s.
How to use this calculator
- Choose the settings that match your scenario, using the units shown beside each field.
- Enter file size, file size unit, desired transfer time (seconds), usable connection efficiency (%).
- Calculate, then review the method and assumptions alongside the results.
A few common questions
Does this select an internet plan?
No. It gives the arithmetic throughput requirement; actual delivery depends on both ends of the connection.
Can I use it for uploads?
Yes. The same throughput calculation applies, using an upload target and realistic upload efficiency.