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.
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|---|---|---|---|---|---|---|
| Activity | Times Per Day | Activity | Ltr Per Day | Ltr Per Year | ||
| Shower | 15 Litres per minute | |||||
| Bath | 150 Litres | |||||
| Dishwasher | 30 Litres per load | |||||
| Front Load Washing Machine | 80 Litres per load | |||||
| Top Load Washing Machine | 100 Litres per load | |||||
| Brushing Teeth with tap running | 5 Litres per person | |||||
| Drinking, Cleaning, Cooking per person | 10 Litres per day, per person | |||||
| Hand Basin Use | 5 Litres per time | |||||
| Toilet Flush single | 6 Litres per time | |||||
| Toilet Flush half | 3 Litres per time | |||||
Step 2: Fill out how many times per day you perform certain outdoor activities.
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|---|---|---|---|---|---|---|
| Activity | Times Per Day | Units | Ltr Per Day | Ltr Per Year | ||
| Garden Sprinkler | Garden hose 15L /min. | |||||
| Car Wash | 200 Litres | |||||
| Hosing Hard Surfaces | 15 litres per minute | |||||
| Drip System | litres per hour | |||||
| Filling pool | Size in Litres | |||||
Step 3: Fill in your roof area (m3) and the average rainfall in your location (mm).
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|---|---|---|---|---|---|---|
| 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) |
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Total Per Annum
Your Calculation Summary
| Litres per day | Litres per year | Rain harvested | Tank Size (litres) |
|---|---|---|---|
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