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Water Usage & Tank Size Calculator
Postcode or suburb (AU)
Roof catchment area (m²)
Total roof area feeding the tank.
Tip: You can measure your roof area using
Google Earth’s Path and Polygon tools
.
Runoff coefficient
0.85 (metal)
0.90 (efficient)
0.75 (tile)
Target autonomy (days without rain)
7
10
14
21
How many days you want the tank to cover if it doesn’t rain.
Inside water use
Showers — minutes/day
People showering
Dishwasher — washes/day
Washing machine — washes/day
Toilet — single flush/day
Toilet — half flush/day
Hand basin — uses/day
People (drink/cook)
Outside water use
Garden — minutes/day
Car wash — washes/week
Hose hard surfaces — min/week
Drip system — hours/week
Calculate
Tip: choose from the dropdown if it appears; otherwise just type and click Calculate.
Loading rainfall data…
Avg rainfall (mm/yr)
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Harvestable roof (L/yr)
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Daily usage (L/day)
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Net daily balance
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Recommended min tank (L)
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Tanks that meet or exceed your requirement