Our square footage calculator works out the area of any room or space in square feet, square metres, and square yards. It supports three common shapes: rectangular rooms (length × width), triangular areas (half base × height), and circular areas (πr²). Area calculations are useful for flooring and carpet purchases, painting and decorating, garden planning, and property listings. In the UK, property is typically measured in square metres, while in the US square feet are standard. Our calculator shows results in both units so you can work in whichever system you prefer.