Square Footage Calculator
Calculate the total square footage of your space. Add multiple rooms or areas and get the combined total for flooring, painting, or real estate purposes.
Enter room dimensions to calculate the total square footage.
How It Works
Square footage is calculated by multiplying length by width for each rectangular area. For irregular shapes, break them into rectangles, calculate each, and add them together. Our calculator lets you add multiple rooms for a complete total.
This measurement is essential for estimating materials like flooring, paint, and carpet. It's also used to compare home sizes, calculate cost per square foot, and determine heating/cooling needs.
Note: For precise measurements, measure to the nearest inch and include closets for accurate room sizes. Exclude areas like fireplaces or built-ins that reduce usable floor space.
Frequently Asked Questions
How do I measure square footage accurately?
Use a tape measure to measure length and width at the longest points of each room. For L-shaped rooms, divide into rectangles. Measure in feet and inches, then convert inches to decimals (6 inches = 0.5 feet). Include closets in room measurements.
What's included in a home's square footage?
Finished, heated living spaces are included: bedrooms, bathrooms, kitchen, living areas, and finished basements. Typically excluded: garages, unfinished basements and attics, porches, and outdoor spaces. Standards vary by region.
How much flooring do I need?
Calculate your square footage, then add 10% for waste, cuts, and potential damage. For diagonal installations or complex patterns, add 15%. Always round up to the nearest box or case when purchasing.
How do I calculate paint needed?
Measure wall square footage (perimeter × ceiling height), then subtract windows and doors. One gallon covers approximately 350-400 sq ft. Plan for two coats, so divide your wall area by 175-200 to get gallons needed.
What's the average home size?
The average new US home is about 2,300 sq ft. The average existing home is about 1,800 sq ft. This varies significantly by region, with homes in the South and West typically larger than those in the Northeast.