Spike's Calculators

Siding - Cladding

Wood Cladding

Spike VM

You can use this calculator for most siding types, including shiplap, dolly varden, T&G, bevel, dutch lap, S4S, fibre cement, engineered wood etc...

To use this calculator, you must know the exposed face value (reveal) of the cladding. The result of the calculation will be the total length in lineal meters of cladding that you need.


The amount of exposed face of a piece of cladding varies, and in the case of lapped cladding, it depends on how much you overlap the boards.

actual size - overlap = exposed face
actual size - overlap = exposed face

Cladding Calculator

Length of Wall M
Height of Wall M
Wall Openings
Exposed Face of Cladding mm
Waste %


Wall Area
Cladding to Cover Wall lin. M
Waste Factor Adds lin.M
Total Amount of
Cladding Needed


  1. enter the length of the wall in metres
  2. the height of the wall in metres
  3. any sections that won't need cladding in square metres
  4. the exposed face of the board in millimetres
  5. waste factor in a percentage


  1. the area of the wall in square metres
  2. the amount of cladding in lineal metres
  3. the amount added for waste in lineal metres
  4. the total amount of cladding, including waste in lineal metres
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