Square footage
calculator
Rooms, decks, lawns, countertops — measure the sides, pick the shape, and get the area. Add a price per square foot and the material budget appears with it.
The three shapes that cover most jobs
Rectangles are length × width; circles are π times the radius squared (measure the diameter and halve it); triangles are base × height ÷ 2. Awkward rooms decompose: an L-shape is two rectangles — measure each, add them.
Pricing per square foot
Materials and trades quote per square foot — flooring, tile, paint coverage, lawn care, even rent. Multiply area by rate and the budget is instant. For materials, remember the waste factor: cuts and breakage add 5–15% — the flooring calculator builds that in, and paint converts wall area into cans.
Square footage FAQ
Multiply length by width in feet — a 16 × 12 room is 192 sq ft. For L-shaped rooms, split into rectangles and add the pieces.
Measure the diameter, halve it for the radius, then πr². A 10-foot round patio is π × 25 ≈ 78.5 sq ft.
Divide by 10.764 — 192 sq ft is about 17.8 m².
Yes — cutting waste and breakage typically add 5–10% for flooring and 10–15% for tile laid diagonally. Order above the raw area.