How to Measure the Square Feet of Your House: A Step-by-Step Guide to Calculate Your Home's AreaSarah ThompsonJan 08, 2026Table of ContentsQuick SummaryStep-by-Step Guide to Measure Square FootageCalculate Total Square FootageTips for Accurate MeasurementCommon Mistakes to AvoidFAQFree Smart Home PlannerAI-Powered smart home design software 2025Home Design for FreeQuick Summary- Multiply each room’s length by its width to get its square footage (e.g., 12 ft × 10 ft = 120 sq ft).- Add the square footage of all rooms and usable areas, including hallways, closets, staircases, and balconies, to get the home’s total square footage.- Measure from the outside walls to determine exterior square footage.Measuring the square footage of your house is essential for various reasons, such as selling your home, renovating, or simply knowing how much space you have. To calculate your home's square footage accurately, you need to follow a systematic approach. First, gather your tools: a measuring tape, a notepad, and a calculator. Let's dive into how you can easily measure the square feet of your house!Step-by-Step Guide to Measure Square FootageStart by measuring each room individually. Using the measuring tape, record the length and width of the room. Multiply these two numbers to get the square footage of that room. For example, if a room is 12 feet long and 10 feet wide, its area is 120 square feet (12 x 10).Calculate Total Square FootageAfter measuring every room, add all the individual square footages together to find the total square footage of your house. Don’t forget to include hallways, closets, and any other usable spaces. For instance, if you measured three rooms and they totaled 400 square feet, your house's total area will be 400 square feet plus any additional areas you measured.Tips for Accurate MeasurementTo ensure accuracy, measure twice! Also, consider using a floor plan tool like Coohom's Floor Planner to visualize your space and make calculations easier. If your home has irregular shapes, break it down into smaller rectangles or squares and apply the same measuring technique.Common Mistakes to AvoidA common mistake is forgetting to account for areas like staircases or balconies. Always include these in your calculations. It's also essential to measure from the outside walls if you want to know the home's exterior square footage.FAQStill have questions? Check out our design community for more tips on home measurement!welcome to CoohomHome Design for FreePlease check with customer service before testing new feature.