To understand how to calculate carpet area, measure the internal length and width of each usable room and multiply them. Then, add the area of all bedrooms, living rooms, kitchens and bathrooms. Carpet Area = Length × Width of Each Usable Space For example, a 12 ft × 10 ft room has a carpet area of 120 sq. ft. Repeat the same process for every room to get the total measurement. https://www.laxmigroup.co/articles/carpet-area-vs-built-up-vs-super-built-up-area-key-differences-explained/