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Find out the right rainwater tank size for your property, depending on your intended use and the number of people living there.
He tātaitai āwhata kurawai Rainwater tank size calculator
Rainwater tanks can store water for future use and help you to save money on your water bill.
If you are planning to use your rainwater tank as a stormwater management device to meet Auckland Unitary Plan rules, see our Stormwater device sizing tool.
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Rainwater tank size recommendations
We have calculated that you need litres per day. Based on your roof size, you could collect an average litres per year.
We have rounded these tank sizes up to the nearest 100 litres.
| Tank size options | Potential water savings per month | Average days without tank water per year | Reliance on tank water |
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* The information you provided to us indicates you will not be able to rely entirely on rainwater collection. You will need to have another water supply to supplement your needs.
Find out if you need a consent to add an outdoor water tank.
These results are an estimation based on full reliance on tank water. You will need to carefully consider an appropriate tank size if you are not connected to the existing water network.
This calculator is designed to be used for initial estimation of the tank size you may need. It is not a substitute for professional expert advice and design. It uses household water usage data provided by BRANZ and rainfall data from the last 30 years in Auckland.
The council cannot be held liable for losses incurred as a result of using or relying on the calculator.