This tool is designed to help in calculating the quantity of Hardie® Plank cladding boards needed for your project.

This is an estimate of the minimum order quantity generally required, including allowance for wastage. 

Before using the calculator, you will need the following measurements:
  1. Total width of each façade multiplied by height (excluded gable ends)
  2. Total gable cladding area (if needed). To calculate, multiply the width by the maximum height and divide by two
  3. Length of the bottom and top of all windows and doors will give the total number of metres for ventilation profiles.
  4. The vertical height of external and internal corners will provide the total number of metres of trim required.

Hardie Board Calculator

For any additional trims/items you may require :

James Hardie Order Builder