Water Tank Capacity Calculator
Capacity in litres of a rectangular or cylindrical tank, and sump/overhead tank size for your family.
About Water Tank Capacity Calculator
This water tank capacity calculator works out how many litres a rectangular or cylindrical tank holds. Choose the shape and unit, enter the inside length, width or diameter and the water depth, and read the capacity in litres and cubic metres.
It also helps you size a new underground sump and overhead tank: enter the number of family members and the days of storage you want, and it suggests a sensible capacity for each. It is useful for homeowners, plumbers and builders planning a house. The calculator is free, needs no sign-up and runs in your browser.
How to use Water Tank Capacity Calculator
- Choose rectangular or cylindrical tank and the unit.
- Enter the inside dimensions (water depth, not total height).
- For sizing, enter family members and days of storage.
- Read the capacity and the suggested sump and overhead tank size.
Frequently asked questions
How many litres are in 1 cubic metre?
1 m³ = 1,000 litres, and 1 cubic foot = 28.317 litres.
How much water does a family need per day?
IS 1172 and CPHEEO recommend about 135 litres per person per day for urban homes with full flushing. A family of 5 needs about 675 L/day.
How big should the sump be?
A sump usually stores 1–2 days of consumption (more if municipal supply is irregular). The overhead tank typically holds about one day’s use.
How do I calculate water tank capacity in litres?
For a rectangular tank, multiply length × width × water depth in metres and then by 1,000. For a round tank, use π × radius² × depth × 1,000.
How many litres is a 10 × 10 × 10 ft tank?
1,000 cubic feet is about 28,317 litres.
What size water tank does a family of four need?
At about 135 litres per person per day, a family of four uses around 540 litres a day, so a 1,000 litre overhead tank is common. Enter your details for a suggestion.
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