Free tool
Water tank size calculator
How many litres does your household need? Get the right overhead or underground tank size.
Water tank estimator
Planning figure: 135 litres per person per day (IS 1172).
- Daily need
- 540 L
- Tank for 1 day
- 750 L
- Tank for 2 days
- 1,500 L
- Your pick (2 days)
- 1 × 1,500 L
Standard sizes: 500, 750, 1,000, 1,500, 2,000, 3,000, 4,000, 5,000 L. Larger needs combine tanks. We confirm availability by brand.
How this works
Daily need = number of people × 135 litres (the planning figure used in IS 1172 for domestic water supply). Storage = daily need × days of storage. We then match it to the nearest standard tank size, and combine tanks above 5,000 litres.
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Common questions
About this tool
How many litres of water does a person use per day?
A common design figure for Indian homes is 135 litres per person per day (IS 1172). Actual use depends on your habits, a garden, and whether you use a washing machine and dishwasher.
What size overhead tank do I need for a family of four?
Four people need about 540 litres a day. A 1,000 litre tank gives close to two days of supply. Many homes add an underground sump for extra buffer.
Should I have both an underground and an overhead tank?
It is a common setup. The sump stores water from the supply, a pump lifts it to the overhead tank, and gravity feeds the taps. Tell us your supply timing and we can size both.
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Turn these numbers into a quote
Share a few details and we will come back with brand options and a quotation. Prefer to talk? Call or message us.
- +91 98268 56322
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- info@keshripipes.com
- Ramnagar, Raipur, Chhattisgarh 492001