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The Tankulator: Rain Harvesting Calculator

Posted in Models, Research by Kate Archdeacon on October 28th, 2011

Photo by AWWS via flickr CC

The Tankulator is a free online rain harvesting calculator that can help you plan for a new rainwater tank or improve the performance of an existing tank.

The Tankulator has been developed by the Alternative Technology Association, Australia’s leading not-for-profit organisation promoting sustainable solutions for the home. Click on the Get Started button, fill out the online questionnaire then click on the Get Tankulating button. An interactive graph will appear that will display your calculations.

Once the calculation is complete, you can compare different scenarios to find the best match for your circumstances. Will you run out of rainwater in a dry year if you live in Canberra and plumb a 10,000 litre tank to your toilet and laundry?

Buying a rainwater tank?
  • Tank Materials: Compare the cost, environmental impact, life span and other specs of different types of tank materials. Hear what ATA members say about the tanks they have chosen.
  • Tank Siting and Installation: What will fit on your property and where to put it? Pros and cons of different approaches to placement and installation of your tanks.
  • Tank Filtration: What kind of filtration do you need on your system? What degree of maintenance are you willing to undertake?
  • Pumps: Most rainwater systems will need a pump; what do you need to know? Also, pumps can use a lot of energy but there are ways to design your pumping system to reduce energy use.
Visit the Tankulator website to find out more.

A free online seminar on rainwater harvesting and greywater will be held by the ATA on Tuesday, November 8 at 11am. Visit for more details.

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