Mbps and MB/s are not the same
Internet plans usually advertise megabits per second, while files are measured in megabytes or gigabytes. Eight bits make one byte, so 80 Mbps has a theoretical maximum near 10 MB/s.
Real downloads include overhead
Protocol overhead, server limits, congestion, signal changes and other devices reduce usable throughput. The practical estimate adds a margin rather than promising the theoretical minimum.
Large mobile downloads can change networks
A phone may switch between 5G, LTE and Wi-Fi during a transfer. Recalculate with the slower sustained rate when you need a conservative estimate.
Frequently asked questions
How long does 1 GB take at 100 Mbps?
The theoretical time is about 80 seconds when using decimal units. Real transfers commonly take longer because of overhead and speed variation.
Why is my download slower than the calculator?
The entered speed may be a peak test result. Server capacity, congestion, signal quality and protocol overhead affect sustained speed.
Should I enter Mbps or MB/s?
Use the unit shown with your speed. Most internet and mobile plans use Mbps; download apps sometimes display MB/s.