Construction

Square Footage Calculator

Calculate the area of any space in square feet and square meters for rectangles, triangles, circles, and trapezoids.

Quick Answer:A standard US single-car garage is approximately 200 sq ft (12×16 ft), a two-car garage is 400 sq ft. The median US home size in 2026 is approximately 2,200 sq ft. To calculate rectangular area: multiply length × width in feet. A 10×12 room is 120 sq ft (11.15 sq meters).

Dimensions

Total Area

Calculating... square feet

Area in Sq Meters

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Area in Sq Yards

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Area in Acres

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Perimeter

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Visual Comparison

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Square Meters—
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Expert Insight 2026 Pro Tip

Construction planning tip for 2026: When estimating materials, always add 10-15% extra for waste and cuts. For flooring, a 200 sq ft room needs approximately 220-230 sq ft of material. In 2026, average flooring costs are: hardwood $8-15/sq ft installed, laminate $4-8/sq ft, vinyl plank $3-7/sq ft, tile $6-15/sq ft. For paint, one gallon covers approximately 350-400 sq ft — a 12×10 room with 8ft ceilings has about 352 sq ft of wall area (minus doors/windows).

Square Footage Guide & FAQ

How do you calculate square footage for different shapes?

Rectangle: Area = Length × Width. Triangle: Area = ½ × Base × Height. Circle: Area = π × r² (radius squared). Trapezoid: Area = ½ × (Base A + Base B) × Height. For irregular rooms, divide into rectangles and triangles, calculate each, then add them together. Example: An L-shaped room can be split into two rectangles — a 12×10 section (120 sq ft) and a 6×8 section (48 sq ft) = 168 sq ft total. For rooms with bay windows or angled walls, use the trapezoid formula for those sections. When measuring, always use the longest dimensions and measure in feet and inches. Convert inches to decimal feet: 6 inches = 0.5 ft, 3 inches = 0.25 ft. Always measure from wall to wall at floor level.

How do you convert between square feet, square meters, and acres?

Key conversions: 1 sq ft = 0.0929 sq meters. 1 sq meter = 10.764 sq ft. 1 acre = 43,560 sq ft = 4,047 sq meters. 1 sq yard = 9 sq ft. A tennis court is about 2,808 sq ft (260.9 sq m). A basketball court is 4,700 sq ft (436.6 sq m). A football field (including end zones) is 57,600 sq ft (5,351 sq m) or 1.32 acres. For land measurement: a standard US city lot is typically 5,000-8,000 sq ft (0.11-0.18 acres). A quarter-acre lot is 10,890 sq ft — roughly 104×104 ft. In real estate, square footage typically refers to "heated and cooled" living space — garages, unfinished basements, and covered porches are usually excluded from listed square footage but may add value.

How much does square footage affect home value in 2026?

The price per square foot is one of the most important metrics in real estate. In 2026, national average is approximately $150-180/sq ft for existing homes, varying dramatically by location: Manhattan ~$1,200-1,500/sq ft, San Francisco ~$800-1,000/sq ft, suburbs of major metros ~$200-400/sq ft, rural areas ~$80-150/sq ft. Adding square footage through renovation typically returns 50-75% of cost — a $50,000 addition adding 300 sq ft increases value by $25,000-37,500. However, the marginal value of square footage decreases: going from 1,000 to 1,500 sq ft adds more per-foot value than 3,000 to 3,500 sq ft. In 2026, remote work continues to drive demand for home offices, making an extra 100-150 sq ft dedicated workspace highly valuable.

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