Calculate the number of siding squares, cartons, and panels needed based on wall surface area and deductions.
Project Surface
ft
ft
sq ft
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Inventory Needed
Sizing up your home?
Enter your wall dimensions and the area of windows/doors to find your siding requirements.
About this calculator
Overview
In North America, vinyl siding is predominantly sold by the 'Square'—a unit covering 100 square feet (9.29m²). Professionals typically purchase siding in cartons that contain 2 Squares (200 sq ft). This calculator determines your net surface area, subtracts openings like windows and doors, and adds a waste factor to ensure you have enough material for overlaps and cuts.
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Pro Tips
For gabled walls, calculate the area using (Base × Peak Height) / 2 and add it to your rectangle total.
Add a 15% waste factor if your home has many corners, dormers, or complicated architectural details.
Don't forget to order 'Starter Strips', J-Channel, and Corner Posts separately; they are measured by linear feet, not square feet.
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Fun Facts
"A 'Square' of siding covers exactly 100 square feet. This is the industry standard for all roofing and siding materials."
"Most standard siding cartons contain 2 Squares (200 sq ft), but 'premium' or 'heavy-gauge' profiles may only have 1 Square per box."
"Vinyl siding expands and contracts significantly; a 12-foot panel can change by 1/2 inch depending on the temperature."
Formula: Net Area = (Width × Height) - Openings; Total Area = Net Area × [1 + (Waste / 100)]
