SIDING
SIDING
squares = ft² ÷ 100
ft²
ft²
RESULT
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1 square = 100 ft² of finished wall. Vinyl, fiber cement, lap, panel — all sold by the square. 10% waste.
About this calculator
This siding calculator gives you the number of squares of siding (vinyl, fiber cement, lap, or panel) you need to cover the exterior of a house. One square equals 100 square feet of finished wall. Most siding is sold by the square at home centers and lumber yards. The calculator subtracts window and door area from gross wall area and applies a 10% waste factor.
Common questions
How much does siding cost installed?
Vinyl: $4–8/ft² installed. Fiber cement (Hardie): $10–16/ft². Cedar lap: $7–12/ft². Wood shingle: $6–11/ft². Stucco: $7–12/ft². Materials are 30–50% of cost; rest is labor.
Do I need to remove old siding first?
Vinyl can sometimes go over existing wood siding if it's flat and sound. Fiber cement and stucco require removal. Always remove if siding is rotted, has insect damage, or trapping moisture. Code in many areas requires removal regardless.
How long does siding last?
Vinyl: 20–40 years. Fiber cement: 25–50 years (warranty often 30+). Cedar: 15–30 years if maintained, less if neglected. Stucco: 50+ years if properly applied. Aluminum: 20–40 years but dents easily.