How to calculate the area of wall tile used in my bathrooms

[mgianzero]

I remodeled three bathrooms with HDP and imported my selection of tile with appropriate size to place certain areas of some of the walls in my bathrooms.  Is there a simple way to determine how much tile I need to order from these models to give to my contractor?

 

When I select "Tools->Materials List->Calculate Materials in Room" option it merely lists "Wall Board" as "WB1" with a total sq ft for entire room, but each wall has different types of tile and only partially up some walls.  Is there some sort of way of just selecting the material on the wall and determining it's area?

 

I've attached some pics of two of my bathrooms with different tiles going up different parts of each wall.