For a rough decimal estimate, multiply megabits per second by viewing seconds and divide by eight to obtain megabytes. Actual usage includes overhead and variable bitrate, so use the router or provider meter for billing decisions.
Work through one example
A steady 8 Mbps stream for one hour transfers about 3.6 GB of media using decimal units. Four hours would be about 14.4 GB at that unchanged rate. This is an arithmetic illustration, not a promised rate for any resolution.
Allow for changing conditions
Adaptive streams can move between versions, while audio and protocol overhead add data. Pausing, seeking and replaying can also change consumption. Your mobile carrier or broadband provider may use a different reporting period from the player.
Set sensible monitoring habits
Check the actual account meter after a representative session, especially on a capped connection. Background app updates and other devices may be included in the same total. Use a lower suitable quality if the remaining allowance is limited.
