Square Feet Calculator

Square feet (sq ft or ft²) is a unit of area measurement in the imperial and US customary systems. Core Definition: One square foot = the area of a square with sides measuring 1 foot each 1 ft² = 1 ft × 1 ft = 144 square inches Common Area Formulas: 1. Rectangle/Square: Area = Length × Width Example: Room 12 ft × 10 ft = 120 sq ft 2. Triangle: Area = (Base × Height) / 2 Example: Base 8 ft, Height 6 ft = (8 × 6) / 2 = 24 sq ft 3. Circle: Area = π × radius² Example: Radius 5 ft = π × 5² ≈ 78.54 sq ft 4. Irregular Shapes: Divide into smaller regular shapes and sum their areas Conversion Factors: • 1 square foot = 144 square inches • 1 square foot ≈ 0.0929 square meters • 1 square yard = 9 square feet • 1 acre = 43,560 square feet • 1 square mile = 27,878,400 square feet Practical Applications: 1. Flooring: Calculate tiles, carpet, or hardwood needed 2. Painting: Determine paint quantity for walls 3. Real Estate: Property size and pricing 4. Construction: Material estimation 5. Landscaping: Sod, mulch, or fertilizer coverage 6. HVAC: Sizing heating and cooling systems Measurement Tips: • Always use same units (convert inches to feet first) • Measure at widest points for irregular rooms • Add 5-10% extra for waste and cuts • For multiple rooms, calculate each separately then sum Common Room Sizes: • Small bedroom: 100-150 sq ft • Master bedroom: 200-300 sq ft • Living room: 300-400 sq ft • Kitchen: 150-200 sq ft