Calculate square footage for rectangular, L-shaped, circular, and triangular spaces. Ideal for flooring, painting, and construction projects.
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Need to know the square footage of a room, deck, or other space? Our square footage calculator makes it simple. Calculate area for rectangular rooms, L-shaped layouts, circular spaces, and triangular areas. Get instant results in square feet, square meters, and square yards—perfect for flooring, painting, landscaping, and construction projects.
Square footage is the measurement of a two-dimensional space's area, expressed as the number of square feet. It's calculated by multiplying length by width for rectangular spaces. For other shapes, specific formulas apply. Square footage is essential for estimating materials, comparing property sizes, and planning renovations. One square foot equals a square measuring 12 inches on each side.
Basic Area Formula
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Handle rectangular rooms, L-shaped spaces, circular areas, and triangular regions.
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Plan renovations, additions, and new construction with accurate area measurements.
For a rectangular room, measure the length and width in feet, then multiply them together. For example, a 12-foot by 15-foot room is 180 square feet. For irregular shapes, break the room into rectangular sections, calculate each, and add them together.
A 10x10 room is 100 square feet (10 feet × 10 feet = 100 sq ft). This is a common size for small bedrooms, home offices, or nurseries.
Divide the L-shape into two rectangles. Measure length and width for each section, calculate the area of each (length × width), then add the two areas together for total square footage.
Yes, closets are typically included in a room's square footage if they're part of the living space. However, mechanical closets and unheated storage spaces may not be counted in total home square footage.
One square yard equals 9 square feet (3 feet × 3 feet). To convert square feet to square yards, divide by 9. For example, 180 sq ft = 20 square yards.
For circles, measure the radius (distance from center to edge) or diameter (distance across through center). The formula is: Area = π × radius². Or use diameter: Area = π × (diameter ÷ 2)².
Usable square footage is the actual space within walls that you occupy. Rentable square footage includes your proportional share of common areas like lobbies and hallways. This distinction matters for commercial leases.
For material estimates, measure to the nearest inch and round up. For flooring and paint, accuracy within a few inches is sufficient since you'll add 10% waste. For property appraisals or sales, measure to the nearest inch.
Measure the longest length and widest width, then calculate square footage. This ensures you have enough material. For very irregular rooms, break into sections and calculate separately.
For material estimates like paint, yes—subtract doors and large windows for accuracy. For flooring and total square footage, don't subtract them since you're measuring wall-to-wall floor area.
Multiply square meters by 10.764 to get square feet (1 m² = 10.764 ft²). To convert the other way, divide square feet by 10.764. For example, 50 m² = 538 sq ft, and 1,000 sq ft = 92.9 m². This calculator shows every result in square feet, square meters, and square yards at once, so you never have to convert by hand.