43sqft of heating area.

Added: 09/04/2014
Heating mat starts by the thermostat at laundry room and runs all the way to the entrance. After turn, installing five small rows to cover area in front of vanity, then slightly move to the right and up, following with three 7" wide rows next to toilet and shower. Left out small spot covering with free cable.
HTMATKIT-120-40 is the most suitable heating mat for the project.