Spike's Calculators

Siding - Cladding

Fiber Cement Cladding Calculator

Fiber cement cladding calculator that will calculate the amount of boards needed to cover a wall using metric measurements. It can be used for any type of external wall cladding, including Engineered Wood Cladding that comes in boards of one length.

Siding length, siding width and exposure required need to be entered in millimetres.

Ex: A board 4200mm x180mm with an overlap of 30mm

Values that need to be entered for this size board would be:
Siding Length: 4200mm
Siding Width: 180mm
Exposure: 150mm
Siding Exposure Lap

Some common board sizes

4200mm x 180 mm
4200mm x 300mm
4200mm x 230mm
4200mm x 205 mm
3600mm x 180 mm

Items marked * must be entered.

* Siding Length:   mm
* Siding Width:   mm
* Exposure:   mm
  Trim and Corner Width:   mm
  Number of Barge Board:   #


Add the element(s) you require with the following buttons or with the buttons on the added element.
The totals will be displayed in the box below.
Added elements must be filled in for the correct totals to be shown, use the Remove button to delete unused elements.

Total amount needed:

   Total Siding: # of planks
   Total Barge: Lineal Metres
   Total Trim: Lineal Metres
   Total Drip: Lineal Metres
   Total Wrap: Metres ²
   Total Nails: #
  • Note:
  • Siding needed does not include a waste factor.
  • House Wrap needed does not include amounts needed for overlaps.
  • Nails are based on nailing the siding boards at 600mm centers.
  • In addition this calculator does not provide the amount needed for joint flashing and tape.

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