Square Footage Calculator

Calculate area in square feet for rectangles, triangles, circles, and trapezoids. Use for flooring, painting, landscaping, and more.

Shape

Area

sq ft

sq m

Formulas

Rectangle

Area = Length × Width

Triangle

Area = ½ × Base × Height

Circle

Area = π × Radius²

Trapezoid

Area = ((Side A + Side B) / 2) × Height

Break the room into simple shapes (rectangles, triangles), calculate each area separately, then add them together.

Multiply square feet by 0.0929 to get square meters. This calculator shows both units automatically.

For L-shaped rooms, split the area into two rectangles, calculate each separately, and add the results together.