Vinyl Siding Calculator

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ft
doors
windows
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Construction

Calculate vinyl siding squares, J-channel, and trim needed for a house.

Formula

Squares = (gross area − openings) × (1+waste%) ÷ 100
  • 1 square = 100 sq ft. Vinyl siding is sold by the square.
  • Door = 3×7=21 sq ft; Window = 3×5=15 sq ft (assumed average).
  • Add separate quantities for soffit, fascia, and frieze board.

180 ft perimeter, 9 ft walls, 4 doors, 12 windows, 10% waste

Inputs
  • Building Perimeter: 180 ft
  • Average Wall Height: 9 ft
  • Number of Doors: 4 doors
  • Number of Windows: 12 windows
  • Waste %: 10 %

Gross: 1620. Openings: 84+180=264. Net: 1356 × 1.10 = 1491 sq ft = 14.91 squares.

Frequently asked questions

How do I measure for vinyl siding?
Measure each wall section (width × height) and add gable ends. Subtract door and window areas. Divide total by 100 for squares.