Determining Square Footage
Measure the length and width of each living space in your house that is heated or air conditioned. Do not include areas like garages or unfinished basements that typically do not receive heating or cooling.
Multiply the length of each room with its width to derive the square footage of that room. For example, if a room is 15 feet long and 20 feet wide, the square footage of that room would be 300 square feet.
Add the square footage of each room to arrive at the total square footage of the living spaces in your home.
Determining Cubic Footage
Measure the length, width and height of each living space within your home.
Multiply the length, width, and height together to determine the cubic footage of each room. For example, if a room is 15 feet long, 20 feet wide, and 8 feet tall, then the total cubic footage for that room would be 2,400 cubic feet.
Add the cubic footage of each living space within your house to determine the total cubic footage of all the living spaces.
Things You Will Need
- Measuring tape
- To make quick calculations about square or cubic footage without a calculator, you can visit many websites across the Internet that can do the calculations for you. One such site is Online Calculators, which can be accessed by clicking the link in the Resources section of this article.