Square Footage Calculator
Compute the area of a rectangle in square feet and square metres.
Example values are shown — change any of them and the answer updates live.
ft
ft
%
$/ft²
Total area
120 ft²
12 × 10 ft
With waste132 ft² (10%)
Material cost—
Converted11.1 m²
Waste covers cuts and off-cuts — order extra for pattern matching. Cost is materials only, no labor.
Waste: 5% vs 15%
5% waste
126 ft²
5%
15% waste
138 ft²
15%
The difference is of material.
12 ft²
Total area
Step 1 · Total area
l × w
12 × 10 ft
120 ft²
Step 2 · With waste
area × (1 + waste%)
10%
132 ft²
Exact arithmetic — computed instantly in your browser.