Vinyl Siding Calculator

Vinyl siding is sold by the square (100 sq ft), so estimating a project requires converting your wall dimensions into squares — plus accounting for waste, cuts, and openings. Enter your wall width, wall height, gable dimensions, and windows & doors area into the Vinyl Siding Calculator, along with your panel width, panel exposure, cost per square, and waste factor to get your total material cost. Secondary outputs include total area needed, squares needed, and panels needed.

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Total square footage of windows and doors to subtract

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Cost per 100 sq ft square of vinyl siding

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Extra material for waste and cuts

Results

Total Material Cost

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Total Area Needed

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Squares Needed

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Panels Needed

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Frequently Asked Questions

How much vinyl siding do I need for my house?

Calculate the total square footage of all exterior walls, subtract windows and doors, then add 10% for waste. Vinyl siding is sold in 'squares' (100 sq ft units).

What is a 'square' of vinyl siding?

A square is a standard unit equaling 100 square feet of siding material. Most contractors and suppliers price vinyl siding by the square rather than per square foot.

How do I measure for gable areas?

Measure the width of the gable base and the height from the peak to the base. The area equals (width × height) ÷ 2 for triangular gables.

Why should I add waste factor to my siding calculation?

A 10% waste factor accounts for cutting around windows, doors, corners, and potential mistakes. Complex house designs may need 15% waste allowance.

How many panels are in a square of vinyl siding?

The number of panels per square varies by manufacturer and panel size. Typically, you'll get 12-15 panels per square depending on panel width and exposure.

What areas should I exclude from siding calculations?

Subtract the area of windows, doors, garage doors, and any other openings that won't be covered with siding. Measure each opening and add them together.

How do I estimate vinyl siding costs?

Vinyl siding costs range from $100-$300 per square depending on quality and style. Add installation costs of $200-$500 per square for total project cost.