The formula to find the area of the walls of a rectangular room is a 2h l b h is wall height l is room length and b is room breadth.
Area of wall of a room formula.
Length x width area.
The area of doors and windows are ignored.
You will need this measurement when estimating the amount of tile mortar grout and sealer that you will use for your project.
Next use the same formula to record the individual area of windows and doors.
Because most walls are square or rectangular you can determine their surface area by multiplying the width and height measurements and then subtracting any door or window space.
So if your room measures 11 feet wide x 15 feet long your total area will be 165 square feet.
Simplify your math by rounding inches to feet unless absolutely necessary.
If the perimeter is 40 feet and the height is 10 feet multiply 40 times 10 feet to get a wall area of 400 square feet.
Hence the total area of the four walls lh bh lh bh 2lh 2bh 2h l b.
Sketch the surface area to be measured and record the measurements and results as you go.
Walls to calculate the area of a wall use the standard formula of length x width area.
Its area lh for the rectangle daeh the lengths of two adjacent sides are b and h.
For the rectangle cdhg the lengths of two adjacent sides are l and h.