Find the number of squares of siding product needed by start the dimensions of the building below for a wall or gable. Optionally, include the number of doors and also windows to refine the estimate.

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If you’re to plan a siding replacement project or preparing to install a new exterior, climate the first thing you have to do is calculation the size of the project. This step will aid with estimating material and labor costs.


Siding is regularly estimated and priced through the square.

How much is a Square that Siding

Square is a term used by contractors, installers, and building suppliers and also is a unit that measure equal to 100 square feet that material.

Vinyl siding is typically estimated through the square come determine just how much labor and also material is needed.

One square the siding will certainly cover 100 square feet, and also an typical box of vinyl siding includes 2 squares that material.


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To uncover the variety of squares of siding essential for one installation, measure up the width and height the each wall surface in feet. Main point the width and height to get the area the the wall in square feet.

Divide the square clip by 100 to obtain the variety of squares needed for the wall.


For example, a wall that is 40ft wide and 12ft high will need 4.8 squares that material.

40 × 12 = 480480 ÷ 100 = 4.8


How to measure up Gable Walls

Finding the square clip of a gable wall is similar to recognize the square footage of a typical wall. Measure up the width of the gable and the elevation of the gable, indigenous the base of the triangle come the peak.

Then main point the width and also height, similar to you would to discover the area that a rectangle. Finally, divide the area in fifty percent to get the last square footage. Division by 100 to acquire the variety of squares.


For example, a 20ft wide gable that is 10ft high will require 1 square that material.

20 × 10 = 200200 ÷ 2 = 100100 ÷ 100 = 1


It is a an excellent idea come order additional material come account because that angle cutoffs along the sheet of the gable roof.

How come Account because that Doors and Windows

A wall with doors and also windows may require fewer squares of product to cover than a wall surface with no doors. Come account for this overage in material, uncover the square footage of an are that will certainly not be spanned in siding because that the doors and also windows and subtract the from the full square footage of the wall.

For example, an average door is 3ft vast by 7ft high. Subtract 21ft2 indigenous the total square footage to account because that a door. Windows differ in size, and the square footage deserve to be found by multiplying the length and also the width.

It is a an excellent idea to account for waste throughout installation and also order additional material. It is generally recommended come order an additional 10% material to account for cutoffs, trim, and also other waste.

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Additional Siding Measurement and Installation Resources

For clapboard and also lap siding, use our clapboard siding calculator to find the variety of boards necessary to cover the home. The board and batten siding calculator deserve to estimate the product needed because that a board and batten project.