Square Foot Converter

About Square Feet (ft²)

The square foot (symbol: ft², sq ft, or sf) is an imperial and US customary unit of area. It is defined as the area of a square with sides of 1 foot in length. One square foot is equal to 144 square inches or 1/9 of a square yard.

The square foot is widely used in countries that employ the imperial or US customary systems, particularly for architectural and real estate purposes. It provides a practical measure for rooms, houses, and smaller plots of land.

Square feet are primarily used for:

• Measuring the area of rooms, apartments, and houses.
• Real estate listings and property valuation.
• Calculating the amount of materials needed for construction or renovation (e.g., flooring, tiles, paint coverage).
• Garden and small land plot measurements.

• 1 square foot (ft²) = 144 square inches (in²)
• 1 square foot (ft²) ≈ 0.111111 square yards (yd²)
• 1 square foot (ft²) = 0.09290304 square meters (m²)
• 43,560 square feet (ft²) = 1 acre
• 27,878,400 square feet (ft²) = 1 square mile (mi²)

The U.S. survey square foot is based on the U.S. survey foot (1200/3937 meters) and is very slightly larger than the international square foot. For most practical applications, this difference is negligible.

To help visualize a square foot:

• A standard floor tile is often 1 foot by 1 foot (1 square foot).
• A small doormat might be 2-3 square feet.
• A single bed takes up approximately 20-25 square feet.
• A typical parking space is around 150-200 square feet.