Square Footage Calculator
Free online square footage calculator for rectangles, circles, triangles, trapezoids, parallelograms, rings, and sectors. Calculate area in square meters, square feet, square inches, and square centimeters.
Rectangle
Circle
Triangle (Base & Height)
Parallelogram
Trapezoid
Triangle (3 Sides)
Ring (Annulus)
Rectangle Border
Sector
What is a Square Footage Calculator?
A Square Footage Calculator is a versatile tool that calculates the area of various geometric shapes in different units. It's essential for construction, flooring installation, painting, landscaping, and any project requiring accurate area measurements. The calculator supports rectangles, circles, triangles, trapezoids, parallelograms, rings, sectors, and rectangle borders.
Area Formulas
Rectangle: A = L × W
Circle: A = π × r²
Triangle (Base & Height): A = (b × h) / 2
Triangle (3 Sides - Heron's formula): A = √[s(s-a)(s-b)(s-c)] (Heron's formula)
Parallelogram: A = b × h
Trapezoid: A = (a + b) × h / 2
Ring: A = π × (R² - r²)
Sector: A = (θ / 360°) × π × r²
Common Applications
- Flooring installation - calculate materials needed for rooms
- Painting estimation - determine paint coverage required
- Landscaping - measure lawn, garden, or patio areas
- Roofing calculations - estimate shingles and materials
- Tiling projects - calculate number of tiles needed
- Carpet and rug sizing
- Wall area for wallpaper or paneling
- Pool and pond surface area
- Land measurement and surveying
- Construction cost estimation based on area