Right size water tank in litres and gallons for your family, with tank dimensions.
How this works
Storage = people x litres per person per day x days. Indian code IS 1172 uses 135 L per person per day for homes with flush toilets. Rectangular tank: footprint = volume / height. 1 imperial gallon = 4.546 L.
Questions people ask
How do I use the Water Tank Size tool?
Fill in the fields, starting with “People in the house”, “Litres per person per day” and “Days of storage”, and change any other options that match your home. The answer, a drawing and practical tips update as you type, and the Copy link button saves your numbers in a link you can share.
Is the Water Tank Size tool free?
Yes. The Water Tank Size tool is free, with no sign-up, and works on phones, tablets and computers. The results are estimates to help you plan, so check with a qualified professional before structural, electrical, gas or plumbing work.