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Water use & conservation calculators
Estimate water use, rain collection, bills and measured leaks.
Choose the right calculation
Use measured flow rates when possible. A rainfall volume estimate is not a storage simulation and can exceed tank capacity. Fixed water charges and sewerage charges may follow separate tariff rules.
Find a tool for your question
Water Use Calculator
Estimate water use for repeated timed activities such as showers.
Rainwater Collection Calculator
Estimate collected water from rainfall, roof area and a runoff factor.
Water Bill Calculator
Estimate water charges from a volume-based rate and a fixed period charge.
Shower Water Saving Calculator
Compare water use before and after reducing flow rate for repeated showers.
Leak Water Loss Calculator
Estimate water lost through a continuous measured leak.
Stored Water Supply Days Calculator
Estimate how long usable stored water lasts at a fixed daily withdrawal.
Can rain collected exceed tank capacity?
The geometric collection estimate can. Storage, overflow, first-flush diversion and use during rainfall need a separate tank model.
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