Free Tools
Water Demand & Tank Calculator
Calculate a home's daily clean-water need and a recommended water-tank capacity for the number of occupants. Free.
Note
An early-planning estimate; final design & permit compliance (PBG) should be done or verified by a competent architect/engineer.
Water need & tank
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Understanding home water needs
Water need per person
A residential guide is ~120–150 liters/person/day for bathing, laundry, cooking, and sanitation. It varies by lifestyle and home facilities.
Tank capacity
A tank stores reserve so water stays available when supply is off or the pump rests. Minimum capacity = daily need × desired reserve days.
Market sizes
Tanks come in stepped capacities (e.g. 550, 1050, 2200 liters). Pick a market size just above your minimum need for enough with a little headroom.
FAQ
Frequently asked questions
How do I calculate a home's water need?
Multiply occupants by water need per person per day (~120–150 liters). E.g. 4 people × 120 liters = 480 liters/day. For tank size, multiply again by the desired reserve days.
What tank size fits my home?
Match daily need and reserve. A 4-person home needing ~480 liters/day usually fits a 550-liter tank for one reserve day, or 1050 liters for a safer reserve.
Why keep more than one day of reserve?
Reserve helps when the utility supply is off, power fails (pump stops), or usage spikes. One day is common for stable supply; outage-prone areas may choose two.
Does the water need include garden or pool?
The ~120–150 liters/person figure covers basic domestic use. For a large garden, pool, or home business, add their needs separately by raising the per-person figure or adding equivalent occupants.
Should the tank pair with a ground tank?
For frequently-off or low-flow supply, a ground tank captures water while it flows, then pumps up to the roof tank. Daily need is unchanged; this combo is about supply reliability, not volume.
Architecture & Planning
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Luxury Art — Architecture & Interior
The planning is set. Now the design.
The calculator here helps you plan space & massing with numbers. Turning it into a beautiful, functional, compliant design takes an architect — that's where Luxury Art works. We handle architecture design, interior design, working drawings, and PBG permit conformity & processing.
Architecture Design
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Interior Design
Space, material, and lighting concepts so every corner feels premium and comfortable to live in.
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Detailed construction drawings that guide builders & contractors — avoiding costly build mistakes.
PBG Conformity & Permit
A design that respects spatial rules (KDB/KLB/GSB) and is ready for PBG permit submission.
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