WeVividWeVividFind how long a file takes to download from its size and your internet speed.
Speeds are in megabits (Mbps); files are in megabytes. 8 bits make a byte.
Wi-Fi, server load and overheads reduce it; the tool applies an efficiency percentage.
Yes, use your upload speed.
No. Everything is worked out in your browser and nothing you type is sent to a server.