AreaLab

Square Footage Calculator

A free square footage calculator for rooms, floors, walls, and yards. The area view covers the three shapes that handle almost every real space — rectangle (length × width), circle (π × (diameter ÷ 2)²), and triangle (½ × base × height) — and irregular rooms are just sums of those pieces: a 12 ft × 10 ft room with a 6 ft × 4 ft alcove is 120 + 24 = 144 square feet. Two more views turn the area into a shopping list. The flooring view adds a waste factor to the floor area and prices the material at your quoted cost per square foot; the paint view converts wall area and coat count into whole gallons at a disclosed coverage rate. Everything computes in your browser on the numbers you enter — a planning estimate, not a contractor quote.