Installation available across NSW & QLD — call 02 6624 4662 for a complimentary quote.
Free planning tool

Find the right tank for your property.

Tell us where you live, how much roof you can capture and who uses the water. We’ll compare local rainfall with demand and recommend a practical tank size.

Australian rainfall dataAbout two minutesNo email required

1Your property

Start with the essentials. You can fine-tune the assumptions below.

    Australian locations only.
    Square metres (m²). Need an estimate? Use the free satellite roof calculator, enter your roof tilt, then use its “actual roof surface” result.
    Regular occupants or users.
    What will the rainwater supply?
    Usage style
    Fine-tune assumptions
    Litres/day. Leave blank for our estimate.

    Finding your location and modelling ten years of rainfall…

    Your entries stay in this browser and are not saved.

    Behind the result

    A better estimate than litres × dry days.

    Storage matters, but so do refill timing and roof yield. The calculator models how water moves through the tank day by day.

    1. Find your location and retrieve up to ten full years of historical daily rainfall.
    2. Turn rainfall on your selected roof area into harvestable litres.
    3. Simulate daily inflow, demand, overflow and shortfall for every available tank size.
    4. Recommend the smallest stocked tank that meets your chosen dry buffer and supply target.
    Important: Historical rainfall is not a forecast or guarantee. This is a planning estimate, not an engineering, plumbing or site assessment. Call 02 6624 4662 for property-specific advice.