About this calculator
Estimate transfer duration from file size and connection speed.
Real throughput is often lower because of protocol overhead and network conditions.
Formula
Seconds ≈ file size(GB) × 8,000 ÷ speed(Mbps), using decimal network units.
Example
10GB at 100Mbps has a theoretical minimum around 13m 20s.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.