Use this spreadsheet to calculate the water consumption of commercial, industrial or institutional developments with and without water saving features.

Download the calculator [13.7 MB]

Information you will need

To use the spreadsheet calculator, you will need to know:

  • the number of bedrooms
  • the water rating for shower head, dishwasher, toilet/urinal, tap fittings and clothes washer
  • the site area
  • total roof area
  • all rainwater tank information
  • all grey water system information
  • any swimming pool, spa or pond information
  • the lawn area
  • the garden area
  • the impervious surface area
  • stormwater retention targets (find out more about stormwater applications)
  • net conditioned floor area
  • the approximate water consumption of the cooling system and the fire testing system
  • the percentage of toilets and urinals connected to the rainwater tanks or grey water system