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Fiber Cement / Engineered Wood Siding Calculator

Calculate the amount of Fiber Cement/Engineered Wood Siding needed to cover a wall online.

Siding Exposure Lap

This calculator can be used to calculate the amount of boards needed to cover a wall when using siding that comes in fixed board lengths such as engineered wood siding and fiber cement siding.

Fiber Cement Siding Manufactures: James Hardie, GAF, Allura, Nichiha, MaxiTile, Cerber

Engineered Wood Siding Manufactures: LP SmartSide, TFP, Collins, Maibec, Marwood

Length of Wall ft inch
Height of Wall ft inch
Wall Openings ft²
Board Length in.
Exposed Face in. n
Waste %


Square Footage of Wall ft²
Amount of Siding
to Cover Wall
# of boards
Waste Factor Adds # of boards
Total Amount of
Siding Needed
# of boards

The Calculation

  1. Enter the wall length. (feet + inches)
  2. Enter the wall height. (feet + inches)
  3. Enter the combined square footage of your windows and doors in "Wall Openings" (square feet)
  4. Enter the board length of your siding. (inch)
  5. Enter the exposed face value of your siding. (inch and fraction)
  6. Enter waste factor if required. (percentage)

The Results

  1. Square Footage of Wall is the wall area minus wall openings.
  2. Amount of siding to cover the wall is the amount of boards needed to cover the wall.
  3. Waste factor is the amount of boards that will be added to the total based on your required waste factor.
  4. Total amount of siding needed = the results from 2 and 3.

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