Construction
Square Footage Calculator
Calculator
Calculate the area of a space in square feet (and optionally square meters). Supports rectangular rooms, circular areas, and triangular spaces. Used for flooring, tiling, painting, landscaping, and real estate.
Formula
Formula
Rectangle: A = L × W | Circle: A = π × r² | Triangle: A = ½ × b × h
For a rectangle or square, multiply length by width. For a circle, enter the radius (half the diameter) as the second field — the area is π × r². For a triangle, enter the base as 'Length' and the perpendicular height as 'Width' — the area is ½ × base × height. All inputs are in feet; outputs include sq ft, sq meters, sq yards, and acres.
Worked example
A rectangular bedroom is 14 ft long and 11 ft wide. Find the area for flooring.
- 1.Shape: Rectangle
- 2.Area = Length × Width = 14 × 11 = 154 sq ft
- 3.In sq meters: 154 × 0.092903 = 14.31 m²
- 4.In sq yards: 154 ÷ 9 = 17.11 yd²
154 sq ft = 14.31 m² = 17.11 yd².
Assumptions and limitations
- All measurements entered in feet.
- For circles, the second input field is the radius (not diameter).
- For triangles, width is the perpendicular height from base to apex.
- Results do not account for waste — add 5–10% for flooring or tiling projects.