Square footage for a two-story house is calculated by adding up the floor area of each level. So, you measure the length and width of each room on both floors and multiply to get the area, then add all those areas together.
The square footage of a two-story house works by separately calculating the area of each floor. You measure the length and width of each room, multiply them to find the area for each room. Then sum up all the room areas on each floor and add the totals of both floors. That's how you get the square footage.
Well, for a 2-story house, the square footage is determined by measuring the individual spaces on each floor. You include all the living areas, bedrooms, bathrooms, etc. The total area of both floors combined gives you the overall square footage. It's important to measure accurately to get an accurate figure.