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Rainwater tank calculator

How much water can I save?

To calculate how much of your household water usage can be replaced by rainwater, use the calculator below.

* Denotes a mandatory field

Supply

2. Roof area of my house that will supply the rainwater tank:

         OR


Input own roof area:
m2
3. Select a rainwater tank size to see how much rainwater will be available to your household:

         OR



Input own rainwater tank volume:
litres
Indoor use

4. How many people live in your home? *

5. I will use rainwater for:
Toilet Washing machine Hot water

Outdoor use

6. If you plan to use your rainwater tank to water the garden please select your typical weekly water usage below:
 

Hose:
Sprinkler:
Watering can:
Drip irrigation system:
This calculator will assume you water your garden the same amount throughout the year and that you will not water your garden if there is a certain amount of rain during the week.

  This calculation may take time. Please be patient.

This Online Rainwater Tank Calculator is provided for use as a guide only and actual water savings will vary from household to household.

To the extent permitted by law, by you using this calculator you accept full responsibility for any outcome arising from that use and agree to indemnify Sydney Water against any reliance, claim, damage or loss arising from the use of the calculator or information obtained or derived from that use.