Water Tank Size Calculator Dubai | Free Tool

Step 1: Number of residents: 4

Step 2: Storage buffer

2 days gives more cushion against a supply interruption, at the cost of a larger, more expensive tank.

Step 3: Property features

Has a garden with irrigationHas a swimming pool (top-up only, not initial fill)

Set your household details and click Calculate to see your recommended size

Based on a commonly-used planning estimate of about 180 liters per person per day, a general figure, not a measurement of your household's actual usage. Real consumption varies by habits, appliances, and whether you have help staff living in. This is a starting point for a conversation, not a final spec, actual installation should confirm with a site assessment.

Why Getting the Size Right Actually Matters

An undersized tank means running dry during a supply interruption or a peak-usage moment, water pressure problems, and a pump that has to work harder and more often than it should. An oversized tank isn't just wasted cost, stored water that sits for longer than necessary has more time to develop the sediment and bacterial growth that regular cleaning has to deal with.

The right size is the smallest one that comfortably covers your household's actual daily needs plus a reasonable buffer, not the biggest one that fits on the roof.

Common Questions

Where does the 180 liters per person figure come from?

It's a commonly-used planning estimate in residential water system sizing, covering typical daily use across drinking, cooking, bathing, and laundry. It's a general planning figure, not a measurement of your specific household, actual use varies with habits, appliances, and household size.

Should I round up or down if I land between two tank sizes?

Round up. The calculator already does this for you, recommending the next available size at or above your calculated need, since running short is a bigger problem than having modest spare capacity.

Does domestic staff living in the property count as a resident?

Yes, anyone living in the property day to day uses water the same as any other resident, so they should be included in your resident count for an accurate estimate.

Is a bigger tank always the safer choice?

Not necessarily. Oversized tanks mean water sits stored for longer than it needs to, which gives sediment and bacterial growth more time to develop, exactly what regular cleaning has to deal with. The right size is the smallest one that comfortably covers real household needs plus a sensible buffer.

Does this apply to both rooftop and underground tanks?

Yes, the sizing principle, daily household demand times a storage buffer, is the same regardless of where the tank sits. Rooftop and underground tanks differ in their contamination risks and cleaning approach, not in how their capacity should be calculated.

Ready to Install or Replace a Tank?

We confirm the right size for your actual property before installation, not a generic default.

Call +971 55 209 9785