Square Footage Calculator
Calculate the area of a rectangular space in square feet, square meters, and acres. Perfect for flooring, landscaping, and real estate.
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Square Feet
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Extended More scenarios, charts & detailed breakdown ▾
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Square Feet
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Professional Full parameters & maximum detail ▾
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Room Areas
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Totals
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How to Use This Calculator
- Enter the length and width in feet.
- Results instantly show area in square feet, square meters, square yards, and acres.
- For irregular rooms, break the area into rectangles and sum them.
Formula
Area (sq ft) = Length (ft) × Width (ft)
sq m = sq ft × 0.0929 | sq yd = sq ft ÷ 9 | acres = sq ft ÷ 43,560
Example
Example: 15 ft × 20 ft = 300 sq ft = 27.87 m² = 33.33 sq yd = 0.00689 acres.
Frequently Asked Questions
- Multiply the length by the width, both measured in feet. The formula is Area (sq ft) = Length × Width. For example, a 15 ft × 20 ft room = 300 square feet. For an L-shaped room, split it into two rectangles, calculate each area separately, and add them together. Always measure to the center of doorways and include closets in the room measurement if you are calculating flooring. Double-check measurements at both ends of each wall, since rooms are rarely perfectly square, and use the smaller measurement to avoid over-ordering materials.
- Multiply square feet by 0.0929 to get square meters. For example, 300 sq ft × 0.0929 = 27.87 m². To go the other direction, multiply square meters by 10.764 to get square feet. This calculator automatically shows the conversion in the results panel. Common reference: a standard US two-car garage (20 × 20 ft) is 400 sq ft = 37.16 m². International construction projects and European listings typically use square meters, so having both values is useful when comparing specifications.
- One acre equals exactly 43,560 square feet, 4,840 square yards, or approximately 0.4047 hectares. To visualize an acre: it is roughly the size of a US football field from end zone to end zone (minus the end zones). A standard US city block is about 2–3 acres depending on the city. To convert your square footage to acres, divide by 43,560. For example, a 200 ft × 300 ft parcel = 60,000 sq ft ÷ 43,560 = 1.378 acres. This calculator displays acreage automatically in the results.
- Calculate each room separately by entering its length and width, then add the results together for a total. For irregularly shaped rooms, break the floor plan into rectangles, calculate each piece, and sum the areas. For an L-shaped room 20 × 10 ft with a 10 × 10 ft extension: 200 + 100 = 300 sq ft total. When calculating for flooring or paint, always add a waste percentage (10% for flooring, 10–15% for tile) on top of your total area to account for cuts, defects, and future repairs.
- Enter length and width in feet. The calculator automatically converts the result to square meters (multiply by 0.0929), square yards (divide by 9), and acres (divide by 43,560). Most US building materials are priced per square foot, while international products and landscaping supplies may use square meters. If your measurements are in inches, divide by 12 first to convert to feet before entering. For metric users: 1 meter = 3.281 feet, so multiply meter measurements by 3.281 before entering, or use the metric version of the calculator.