Spike's Calculators

Siding - Cladding

Siding Calculator for Gables

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

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

Siding Calculator for Gables

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

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

Calculator for Gables

Length of Wall ft inch
Roof Pitch /12
Board Length inch
Exposed Face in. n
Waste %


Square Footage of Gable ft²
# Of Boards to Cover Gable boards
Waste Factor Adds boards
Total Amount of Boards Needed # of boards


  1. Enter the length of the wall. (feet+inches)
  2. Enter the rise of the roof pitch (rise/12)
  3. Enter the length of the board. (inches)
  4. Enter the exposed face of the board. (inches + fraction)
    Ex: Fiber Cement Siding Most commonly used board size: 12' x 8 1/4" installed with an over lap of 1 1/4" giving an exposed face of 7 inches.
  5. Enter a waste factor if required. (percentage)

The Results

  1. The square footage of your Gable.
  2. Amount of boards needed to cover the Gable.
  3. Amount of boards your waste factor adds.
  4. Total amount of boards needed = 2 plus 3

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