Rainwater Harvesting Calculator
Calculate optimal rainwater tank size based on your roof area, location, and household usage.
Your Details
Roof Area (m2)
Location
Sydney (1213 mm/year)
Melbourne (648 mm/year)
Brisbane (1207 mm/year)
Perth (721 mm/year)
Adelaide (528 mm/year)
Darwin (1729 mm/year)
Hobart (616 mm/year)
Canberra (629 mm/year)
Household Size
Daily Water Usage (L/person)
Dry Days Storage
Include First Flush Diverter
Calculate Tank Size
Enter your details and click Calculate to see your recommended tank size.