1, indoor area calculation formula: indoor area refers to the actual use area inside the house, including rooms, kitchens, bathrooms, etc. The calculation formula of indoor area is: indoor area = house length × house width. The length and width of the house refers to the measured value of the house.
2. Calculation formula of total construction area: The total construction area refers to the total area of buildings, including indoor area, walls and balconies. The calculation formula of total construction area is: total construction area = house length × house width+wall area+balcony area. You can measure the wall area and balcony area.