Rainwater tank calculator

Program name: 
Sydney Water Rainwater tank calculator


The Sydney Water rainwater tank calculator helps residents to calculate the best tank size for their household’s water needs and how much of their water usage can be replaced by rainwater.


  • calculate the best tank size
  • help save drinking water
  • reduce the impact of stormwater run-off

Key eligibility

The calculator provides information relevant to households with a postcode within Sydney Water’s area of operation.

Next steps

Access the calculator at:

Sydney Water website