Water tank calculator

Find out how much water you use and which size tank you need.

How to use the calculator in 3 easy steps:

      Step 1: Fill out how many times per day you perform certain indoor activities.

      Step 2: Fill out how many times per day you perform certain outdoor activities.

      Step 3: Fill in your roof area (m3) and the average rainfall in your location (mm).

Step 1: Fill out how many times per day you perform certain indoor activities.

Indoors

ActivityTimes Per DayActivityLtr Per DayLtr Per Year
Shower15 Litres per minute
Bath150 Litres
Dishwasher30 Litres per load
Front Load Washing Machine80 Litres per load
Top Load Washing Machine100 Litres per load
Brushing Teeth with tap running5 Litres per person
Drinking, Cleaning, Cooking per person10 Litres per day, per person
Hand Basin Use5 Litres per time
Toilet Flush single6 Litres per time
Toilet Flush half3 Litres per time

 

Step 2: Fill out how many times per day you perform certain outdoor activities.

Outdoors

ActivityTimes Per DayUnitsLtr Per DayLtr Per Year
Garden SprinklerGarden hose 15L /min.
Car Wash200 Litres
Hosing Hard Surfaces 15 litres per minute
Drip Systemlitres per hour
Filling poolSize in Litres

 

Step 3: Fill in your roof area (m3) and the average rainfall in your location (mm).

Size Of Water Tank

Roof area (m3)Average Annual Rainfall (mm)Amount of rain harvested (litres)Minimum Tank Size
   Assume the tank can fill 3 times
per year (Depends on rainfall and usage patterns)

 

Total Per Annum

Your Calculation Summary

Litres per dayLitres per yearRain harvestedTank Size (litres)

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