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About This Calculator
Square footage determines material quantities and costs for flooring, painting, landscaping, and real estate valuation, making it one of the most practically useful measurements. This calculator computes area for rectangular, triangular, circular, and irregular spaces, and combines multiple zones into a single total. Real estate listings, building codes, and material coverage rates all depend on accurate square footage that this tool provides.
Quick Tips
- 1 Break irregular rooms into rectangles, calculate each, then add them together.
- 2 Multiply length by width in feet, then divide by 9 to get square yards.
- 3 Closets and hallways count toward livable square footage in real estate listings.
Example Calculation
L-shaped room: main 15ft x 12ft plus alcove 6ft x 8ft.
Total: 228 sq ft | Main: 180 sq ft + Alcove: 48 sq ft | About 21.18 m2
How to Calculate Square Footage
For rectangles, multiply length by width. For circles, use pi times radius squared. For triangles, multiply base times height and divide by 2. All measurements should be in feet to get the result in square feet.
Converting Square Feet to Square Meters
One square foot equals approximately 0.0929 square meters. Multiply your square footage by 0.0929 to convert. This is useful for international projects or when working with metric specifications.
Common Square Footage Applications
Square footage calculations are essential for flooring, painting, roofing, landscaping, and real estate listings. Accurate measurements save money by preventing over-ordering materials and help in comparing property sizes.
Measuring Irregular Spaces
For irregular rooms, break the space into rectangles, triangles, and circles. Calculate each section separately and add the results. For L-shaped rooms, divide into two rectangles. For curved areas, approximate with a circle or series of triangles.
Frequently Asked Questions
Break the room into smaller rectangles, measure each one separately, and add the areas together. For example, an L-shaped room can be divided into two rectangles whose combined area gives the total square footage.
Select Circle as the shape and enter the radius (half the diameter) as the length. The calculator uses the formula pi times radius squared (3.14159 x r x r) to compute the area.
Linear footage measures length in one dimension (a line), while square footage measures area in two dimensions (length times width). A 10-foot linear measurement is a line; a 10-square-foot area could be 2 ft by 5 ft.
One acre contains 43,560 square feet. To convert square feet to acres, divide by 43,560. A typical residential lot ranges from 5,000 to 15,000 square feet (about 0.11 to 0.34 acres).