You’re downloading data with every webpage you load. Some online activities, like streaming HD content and online gaming, are more data-intensive than others and will eat into your allowance faster.
The following is a good guideline for the amount of data common internet activities use:
1 hour of browsing the web: 10 to 25MB
1 hour of streaming music: 100MB
1 hour of watching YouTube: 350MB
1 hour of watching Netflix SD: 1GB
1 hour of watching Netflix HD: 3GB
1 hour of video calling: 125MB - 650MB
1 hour of online gaming: 40GB
A connection with a 1TB of data allowance will allow you to comfortably watch around 400 hours of streaming services each month—or 13 hours a day. That’s enough for all but the most committed binge-watchers.