How much internet speed do you need
Add up your household streaming, calls and downloads and get a realistic megabit target.
0 Mbit/s download
The arithmetic
Each activity gets a realistic peak figure, not a marketing figure: about 25 Mbit/s for a 4K stream, 6 for an HD stream, 4 for a video call, 3 for online gaming (gaming needs steady latency far more than bandwidth), 5 per person working from home, and up to 30 for heavy cloud backup. The tool adds the ones happening at the same time, adds 30 percent headroom for the background traffic every household has, and rounds up.
The result is usually lower than what you are sold. That is the point. Very few households need a gigabit line, and the ones that feel slow usually have a wifi problem rather than a plan problem.
Why upload matters more than the adverts suggest
Video calls, cloud photo backup and sending large files all push data the other way. Cable and DSL connections give you a fraction of the download speed as upload, while fiber is usually symmetric. If your calls freeze while someone else's backup is running, upload is the constraint, not download.
Next: how much internet speed you need explains the trade offs in full, and reading a speed test shows what the three numbers on a test result actually mean.