Siding Calculator

Calculate how much siding material you need for your home exterior. Accounts for walls, gables, doors, and windows with waste factor.

🏠 Siding Calculator

Results

Gross Wall Area1,500.00 sq ft
Openings Deducted162.00 sq ft
Net Siding Area1,338.00 sq ft
Total (+ waste)1,471.80 sq ft
Siding Squares14.7 squares

πŸ’‘ How to Calculate Siding Materials

Siding is measured in 'squares' (100 sq ft each), similar to roofing. Start by calculating the gross wall area: average wall length Γ— wall height Γ— number of walls, plus any gable-end triangles. Then subtract openings: standard doors (β‰ˆ 21 sq ft each) and windows (β‰ˆ 15 sq ft each).

Add 10% waste for standard rectangular homes with few obstacles. Increase to 15% for homes with many windows, unusual angles, or complex trim details. Siding types differ in coverage β€” vinyl panels are typically sold by the square, while fiber cement comes in individual planks.

A home with 4 walls averaging 40Γ—9 ft plus 60 sq ft of gables, with 2 doors and 8 windows: gross = 1,500 sq ft βˆ’ 162 sq ft openings = 1,338 sq ft net. With 10% waste = 14.7 squares of siding.

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