What is the square footage of my house? Learn how to calculate the square feet of a house, no matter the shape of your home or its rooms.

You probably know how to calculate the square footage of a simple room without any funny shapes. Just break out your measuring tape -- or a laser measure -- to get its length and width.

How do I calculate square footage? Bronson and McDonald agree that, in the simplest terms, the formula for calculating square footage is length (in feet) multiplied by width (in feet).

Calculate the square footage for each section separately, then add them together. Example: If you have a room with a rectangular section and a triangular extension, work out each part's area and ...